Monday, December 4, 2017

Aviation History / Model Aviation Hobby Demo

Never do I get bored with my model aviation hobby as I have many facets in the hobby that I enjoy.  Competition in free flight and radio control sailplanes is part of it but I also enjoy flying just for fun,  model air plane building with student groups, and giving demonstration of model aviation while combining history.  My more recent demonstrations have been to older groups but I have also demonstrated in public schools and a local university.  My hope is that through practice I am getting more connected with my target audience and making the presentation more interesting. I recently did a presentation for two groups in a nursing home and they really appeared to enjoy what I presented.


Models and Posters


This blog post will be really short but I encourage those interested to check out previous blog posts on demonstrations I have done. Please consider doing a demonstration for a group, it is a lot of fun and not that hard. I have included links to some of the products I have used.


Wright Bat and Helicopter Toy used in Student Classes

Very briefly, my presentation is about the progression of ideas in aviation including the role model airplanes were part of. Then I demonstrate the progression of ideas I had starting with the very simple Foam Plate Glider (FPG-9) and then designing more complicated foam gliders and rubber powered airplanes. At the end I do a flying demonstration of some really lightweight models.


Rubber Powered Stick & Tissue Free Flight Models


Progression of Foam Glider Ideas

Rubber Powered Foam Planes


More Foam Gliders
Tiny FPV Quadcopter was Demonstrated


Bill Kuhl
http://www.ideas-inspire.com

Related Blog Articles

Related to Demonstration Models
http://scienceguyorg.blogspot.com/2013/04/free-bird-rubber-powered-ornithopter.html
http://scienceguyorg.blogspot.com/2015/10/flapping-freebird-almost-flies-away.html
http://scienceguyorg.blogspot.com/2013/12/leonardo-da-vinci-ornithopter-kit.html
http://scienceguyorg.blogspot.com/2013/12/leonardo-da-vincis-aerial-screw.html

Previous Presentations
http://scienceguyorg.blogspot.com/2017/10/mousetrap-car-demonstration-at-nursing.html
http://scienceguyorg.blogspot.com/2014/05/500-years-of-aviation-presentation.html
http://scienceguyorg.blogspot.com/2014/01/500-years-of-aviation-history-through.html
http://scienceguyorg.blogspot.com/2013/05/pioneers-of-aviation-presentation.html
http://scienceguyorg.blogspot.com/2015/04/model-aviation-demonstration-for.html

Construction Articles of Foam Planes on My Website

http://ideas-inspire.com/foam-plate-and-plastic-straw-gliders/  Foam Plate and Plastic Straw Gliders
http://ideas-inspire.com/foam-jet-ii-catapult-glider/  Foam Jet II Catapult Glider
http://ideas-inspire.com/hammer-down-catapult-glider/   Hammer Down Catapult Glider
http://ideas-inspire.com/fantastic-foam-flyer/  Fantastic Foam Flyer – rubber power


Video of Practice Before Demonstration





Monday, November 27, 2017

Successful Control Line Flight

First I want to Thank all the people who viewed my first article about electric control line, Google is showing me there were over 800 views in a week.  Maybe not as dramatic I had a successful flight with my airplane on Sunday.  With my order for additional propellers arriving and a warm day for November, I decided based on suggestions people had given me, to put ends on the other set of steel lines I have and cut the lines to 52 feet. 

Happy Landing

The plane had a couple more issues that needed to be corrected before flying and I took the quick and dirty method to resolve.  Hole in covering repaired with clear tape, landing gear that was missing part of dowel attachment, I just rerouted the rubber band holding the landing gear in place. Checking the forecast the wind was 9 mph but was forecast to go to 7 mph by 3 pm.  I drive out to my preferred flying spot and realized I was missing one line connector. I had my electric RC sailplane along and thought I could just fly that but no I was not going to take the easy way out of flying my control line. It was only a couple of miles home so I drove home to get more connectors.

Repair of Covering from First Crash

I put out the lines, checked the control action and got up my courage for another flight. After pushing the start button I ran out to the handle and there was a twist in the line. I only had 20 seconds and the plane would take off, I got the twist out and the motor started to ramp up but the propeller chewed across the blacktop. Off came the small spinner, washer, and propeller. By some miracle I found everything. The threads were a little messed up but I carefully worked the spinner back on. I thought this might be another sign that I should fly it another day but no I had my nerve up.



To reinforce the landing gear I wrapped some masking tape around it, I know not a good idea but I was not going to drive home again to do a better repair. I moved the battery back slightly and in the process ripped some covering on top of the wing, more masking tape.


I double check that the lines were straight and I am ready to try another take off. This time it did not nose over and takes to the sky. It is flying pretty smooth with just a hint of bouncing from the wind. I keep it at a fairly high altitude and keep it there the entire flight. Lap after lap I fly, it was going faster with the shorter lines but the tension was good. People had warned me about getting dizzy and I was starting to feel that could happen, was this thing ever going to shutdown? 


Finally what had to be the longest two minutes ever, just as the control unit is programmed to do, it flies faster to warn of the cutoff and then the motor stops. I brought it in for a smooth landing in the grass. I was happy to say the least but quit flying the plane until proper repairs are done. 


I felt like I could fly it okay after not flying control line for many years but not overly confident. There was a period of 10 years I did not fly radio control either and thought I could fly with no help to start with. First flight of my RC plane after the long time away ended with crashing my plane in the top of a tree shortly after takeoff. I had someone stand by me the next few flights.


Bill Kuhl
http://www.ideas-inspire.com


Monday, November 20, 2017

Adventures in Electric Control Line

The first really successful model airplanes I built were control line model airplanes powered by .049 glow engines. My two best friends in the neighborhood flew control line also, I can remember saving allowance for glow fuel and 1 ½ volt dry cells. I still have a .35 powered control line a Goldberg Buster in flyable shape; I should try flying it again. 

Prop Buster CL Electrified

Before Covering


My new interest to try control line came from a desire to try it again and see if I can do better and also the fact the airplanes can be flown in smaller locations. Now with the availability of electric systems for control line, I thought I could fly it in places that glow engines were not allowed. It seems that many of the people who fly free flight model airplanes, also fly control line also. The other thing I had ran across the Shugemery channel on Youtube and was impressed by his passion for control line model airplanes.  https://www.youtube.com/user/shugemery

Electric Motor has Rear Bearing Mounted in the Plane

ESC and Controller

In my basement stash of model kits I happened to have to control line kits I purchased at a hobby shop before it closed. One was a ½ A size but the other was a Ringmaster Jr, I thought first I would build the Ringmaster Jr as electric but then remember many years ago I had started on a .15 size plane the Prop Buster from MAN plans. The Prop Buster plans were on the back of a RC plane plan for the Oily Bird that I had built. 

My Old EZ Just Handle, I have New Plywood Handle Also


My big worry with electric control line was what it the plane crashed, what will stop the motor from stalling and burning out a component?  The system I purchased from RSM Distribution should automatically shutdown if too large a load is encountered. Slowly I finished the Prop Buster and a week ago I was going to fly it but realized the ends were not on the control line cable I had. It was a rather calm day so I flew my electric RC glider instead and ordered lines with the ends on, I will finish putting the ends on the other cable later.


Takeoff Blacktop, Fly Over Grass


It is getting to the time of year in Minnesota that many more reasonable people quit flying model airplanes outdoors but not me. It was rather windy on Sunday but the sun was out and it was almost 40 degrees, I was going to make one flight and call that enough. The wind worried me but I thought maybe the hills would block it some. I had planned out a spot it could take off from blacktop and then fly over grass.


Crash Scene


I attached the lines, checked the controls and pushed the button to start the electric motor sequence. It runs for a couple seconds to show that it is active, waits 20 seconds, and then runs for 2 minutes. This is the default settings which can be changed. I was scared something would go wrong but I had to go through with it. The last time I flew a large control line I was a teenager but it was rather like controlling a RC plane but only in two dimensions.

With me at the handle, the plane takes off, wow it is really flying. Pretty soon it is getting really wild, the plane is bouncing up and down and the lines wanted to go slack when upwind. Right away I am thinking I really wish I could cut the throttle. It is bouncing up and down but I managed to miss the ground through maybe 6 laps. The line would slack and then jerk as it got closer to downwind leg. I was thinking should I try to dump it when it was close to the ground or try to fly for the 2 minutes.

Despite my efforts to keep it airborne, it hit the ground while the lines were slack. Impact was pretty level and did not have excessive speed but still it did some damage. Vertical fin and stab were knocked off, a dowel that was a stop for landing gear broke, there was a crack in the fuselage, and the propeller was broken.  When I got home I noticed a rip in the covering on the bottom. Most of it is fixed and more props are on order.

Next time I will wait for less wind and be checking out the control better to make sure there are no binds.

Bill Kuhl
http://www.ideas-inspire.com

Related Link
https://www.rsmdistribution.com/



Thursday, November 16, 2017

What I like About Free Flight VI – Nostalgia

In working with computers as a profession I deal with some of the fastest changing technology, I do like learning new things but not everything new do I find wonderful.  Even in my model aviation hobby I tried model helicopters and quadcopters briefly, had some fun and became bored with it. I have purchased several of the RTF fly RC airplanes and become bored with those too fairly quickly.


Witch Hawk 500 Construction

Free flight model airplanes were the first model airplanes and are still the favorite type of model airplane for a good number of people. For many it has held their interest for their entire life although some people fly other types of models too, like I do.  I do not have the great memories of flying the old free flight airplanes like some people do but I do remember seeing the kits and motors in hobby shops plus in magazines. Now I feel like I want to live some of those free flight experiences now.


RTF RC Sbach


Finding that same merchandise in hobby shops today will be difficult but thanks to the Internet it is easy to find most of what was available years ago. New kit laser-cut kits versions of the old models are normally even better than the originals. With the new high powered electric systems the noise and mess are gone but yet I have this desire to build some free flight models with the noisy engines I had avoided for several years flying radio control. 


For One Design Contest 2018


This past year I built and flew my first glow powered free flight which was powered by a tiny Cox PeeWee .020 with the fuel regulated by what was in an eyedropper tank. This plane I built entirely from plans, which was a challenge but the resulting model flies really well. For next flying season I am building a much larger glow powered plane the Witch Hawk 500 using a .19 glow engine for power and also an .049 powered old design the Streak which will use an old K&B .049 engine.


Flying Aces Moth


Last year I built the old time rubber model the Wilbur which I had flying pretty well by the end of the season. For the coming flying season I am building the New Gollywock and a Flying Aces Moth. My current discus launch glider which is a relatively new type of free flight plane came apart in the rain at the Nats so I need to build something new for 2018.

 Bill Kuhl


Wednesday, November 8, 2017

What I Like About Free Flight V - Contests

Just getting my free flight models to fly consistently without crashing is fun but I am increasingly enjoying the competition aspect of outdoor free flight.  Psychology Today article had this to say about competition:

For most people, there is something inexplicably compelling about the nature of competition. Perhaps that’s because, as some scholars argue, “competitiveness” is a biological trait that co-evolved with the basic need for (human) survival.


Happy Free Flight Contestant

The time I spend at a free flight contest goes by the quickest of anything I have ever done. Maybe too much so as I really do not spend much time socializing with some really nice people.  I also fly some RC sailplane competition which keeps one busy also because you are either flying or timing a flight at smaller contests.  Larger RC sailplane contests can have you waiting a fair amount of time between flights; I only have entered one of those. Amazingly I received a third place trophy mainly because I flew fairly consistently without crashing. In my younger years when I flew RC pylon racing, the spare time was spent standing under a pylon to watch for “cuts”.  I also raced electric RC cars for a time and spare time was spent replacing broken parts or being a “corner marshal”.   


Small RC Sailplane Contest

The competition that I have participated in has been the “objective type: as opposed to the “subjective” type where maneuvers or appearance are scored by judges. To me a contest that can be scored by time keeping is the most fair. With free flight there can be a huge number of factors that result in those times. I also flew indoor free flight and did pretty well after several contests; the indoor environment is rather controlled compared to all the factors present flying outdoors.


Registering Free Flight Models at 2016 Nats


Flying outdoors the conditions can change during the day.  Often the wind starts out very light and increases during the day but it can also get stronger or weaker at anytime.  Thermal lift usually gets better later into the morning. This is where strategy comes into play, do you try to get flights in during calmer air with less likelihood of thermal lift or fly later when the wind is blowing harder and your plane is more likely to drift off the field.  Then you probably have so many flights to get in with all the events you are flying, waiting very long to fly is not an option.


Young Winners at Nats Free Flight


Winning at an outdoor free flight contest I have no experience in yet but I sure plan to keep trying. From what I have seen in outdoor free flight; that if your plane is built and adjusted to a fairly good level, a relative new person does have a chance at winning. With the other radio control events I do not think there is much of a chance for a beginner to win.

Bill Kuhl
http://www.ideas-inspire.com


Tuesday, November 7, 2017

AMA Alpha - Pre-release Impressions

I was fortunate, along with other people to get a sample of the new Alpha rubber powered foam and balsa model airplane. The one I received came in a very attractive box and even included a 20:1 winder plus 80 inches of rubber strip. Assembly is very quick but there are a couple of areas you might find a tight fit and need to be careful.


AMA Alpha






The slot on top of the rear of the fuselage was rather tight when I tried to insert the vertical fin. You need to grab it near the bottom in the rear and carefully pull it into the slot. Too much force and the foam can buckle.


Contents of Alpha
Take Care Inserting Vertical Fin

Inserting the propeller nose piece over the balsa fuselage was rather a tight fit also. I sanded off the edges at an angle ever so slightly to make it possible to push the assembly over the balsa. Gary Hinze suggested pushing the balsa against a hard surface to compress it slightly, probably a better idea.


Propeller Nose Piece can be a Tight Fit

Another tight fit is the plastic wing clip that attaches the wing to the fuselage. There were a couple of very thin metal pieces that are to be used in the front of the wing at the center joint, I have not done anything with those yet.


Clip to Hold Wing Halves

Anxious to get some short flights in, I flew my Alpha in a local park on my lunch break. It was windy at times and cold but I did get several flights in using very limited winds in the rubber motor. With the wing held on by the clip it is easy to adjust the CG by moving the wing location.






I hoped to give a longer report on the Alpha after I have flown it from a larger field. The AMA Flight School website has more details on the Alpha and a couple of lessons in PDF format.

11/12/2017 Additional Flights

I replaced my first flight video with two new ones where the wind was lighter.

Bill Kuhl
http://www.ideas-inspire.com

 http://www.amaflightschool.org/alpha  - AMA Website Alpha Details

http://www.modelaircraft.org/shopama/dept.aspx?id=1adc2b6e-966b-4e6b-a40a-87a08c2d - Purchase Alpha



Wednesday, November 1, 2017

Why I Like Free Flight IV – Exploring

Recently I was on rather long hike covering ground I had only walked once before but this time coming from the opposite direction, it was a surprise to me what I would see going around the next bend in the trail. It had me thinking what most people find interesting, is being exposed to new things even if they never leave their house. Yes you can explore so much on the Internet but I like to explore things while working with my hands. I found this statement on the NASA website which kind of sounds like the intro to an episode of Star Trek but it had me thinking why I keep wanting to try new aspects in my hobbies.


Burning Fuse DT

“Humans are driven to explore the unknown, discover new worlds, push the boundaries of our scientific and technical limits, and then push further. The intangible desire to explore and challenge the boundaries of what we know and where we have been has provided benefits to our society for centuries.”


Braiding a Large Rubber Motor New Challenge


In the last couple of years in building and competing with free flight model airplanes I feel like I have been continually pushing my technical limits. I have been exploring different means of propulsion, covering methods, and sizes of aircraft. It seems like I have been on a quest to try just about every method of bringing the aircraft down from a thermal (DT) from burning rope to several electronic dethermalizers. 


Electronic Band Burning DT


In writing my articles of free flight model aviation I realized I really do not have anything new to offer as far as new knowledge on aspects of free flight. What I can offer is how I have approached the many challenges and the experiences I am having. No doubt the experienced modelers have gone through very similar experiences and my writing makes them think of the similar experiences they had while learning.


Building from Plans was a Challenge

Delving even farther to the psychological aspects on why I enjoy this hobby so much I found this in an article in Psychology Today:

“Too much time on technological devices and the fact that we buy almost all of what we need rather than having to make it has deprived us of processes that provide pleasure, meaning and pride.  Making things promotes psychological well-being.”

Next Free Flight Challenge

My next big challenge is building a larger glow powered free flight model, the Witch Hawk 500 from the BMJR kit. Building is not too much of a challenge but this will be the first time I will setup a pressurized fuel system controlled by a mechanical timer.

Bill Kuhl
http://www.ideas-inspire.com

Related Links

http://www.bmjrmodels.com/witch-hawk-500 - Witch Hawk 500 BMJR
http://www.texastimers.com/timers/two_function_full_dt.htm - Texas Timers Max III

Thursday, October 26, 2017

Why I Like Free Flight III - Probability

This series of articles on why I like free flight has been really popular so I am adding another and discuss probability. My view of how the world works is everything is based on probabilities. There are factors that one can adjust to increase the probability towards a more favorable outcome.  In free flight competition the top competitors have identified factors that gives them the highest probability of scoring high in contests most of the time. In outdoor free flight the factors give a higher probability their models will climb very high and glide as long as possible consistently. In outdoor free flight there is also the big factor of launching into thermal air currents, something I definitely need to work on.

Launch to High Altitude on Very Limited Motor Run

Besides what might be obvious factors such as using a very powerful motor or building the plane to just over a minimum weight, there are smaller factors that can influence the reliability of the model over time. This could be such things as the proper materials used to cover the model with, and how the power system and timers are setup. 

Covering With Very Thin Plastic Instead of Tissue


Another thing I really have noticed in the contests I have been to which really isn’t that many, is time management is a big part of it.  Now we could make it easier on ourselves and only fly a couple of events but most of us try to fly more events than we can comfortably handle in a day, this is a good thing as there needs to be enough entrants in the various events. To improve what can be flown in limited time factor, we want everything to be as reliable and trouble free as possible. Anytime you have to spend time doing field repairs, trying to get a motor running, etc. is time that could have been spent flying. Another big waste of time in outdoor free flight is retrieving your model; this is why I purchased a used tracking system. A motorcycle would be a big help also, but cannot be used at our club contests.

Walston Tracking System


No doubt how I waste the most time from official flights and I know a lot of people are in this situation, is that I do not have a proper place to test my models until I get to the contest. At least I have enough space available I can check out the power pattern on electric models and the transition to glide. It really doesn’t give me a good idea what the duration will be when trying for a 2 minute flight on a larger field. When I flew indoor free flight contests I had a place locally to trim models and a mentor to offer constructive criticism; that was a huge advantage to people that came to contest with untested models.

Power Pattern Tested for E36 Starduster on this Small Field


Rubber powered models make it easy to try short flights because you can just put fewer winds in the rubber motor. This really doesn’t give you a good idea of what a contest flight will be like when there is much greater torque provided by the rubber motor. I sure found that out on a rubber model this year that appeared to climb nicely on 200 turns but went into huge stalls at 400 turns.

Testing on Small Field - Not Great

Building season has started where I live but there still can be some flyable weather but only during the day. I want to think about how I can improve my probabilities for consistent flights for the next contest season.

Bill Kuhl


Tuesday, October 10, 2017

Mousetrap Car Demonstration at Nursing Home

Last week I gave a demonstration of mousetrap cars for two different groups in a nursing home. I was concerned how interesting they would find my presentation but it was well received and they are looking forward to me presenting another project idea, I proposed model aviation.

Mousetrap Car Race 



Below is an outline of what I wanted to present, it worked well for a 40 minute presentation:

My Basic Outline for Mousetrap Car Demonstration

* Talk about my father and his farm machinery inventions.

* My interest in model airplanes led to building and flying events for kids, I wanted to expand to more types of model projects and came across mousetrap cars.

* I watched some videos of mousetrap cars on the Internet and was amazed at the number of views.


First Mousetrap Car I Design Built from Bamboo


* My purchase of the Doc Fizzix book on mousetrap cars gave me the background to design my own cars using different materials; the first car was built mainly from bamboo. I also purchased Doc Fizzix kits and started an online friendship with Doc Fizzix, Alden Balmer a truly outstanding teacher.

College for Kids Class Mousetrap Cars


* In teaching a project building class at local university, I had students build mousetrap cars every year.

Lever Arm Attached to Spring on Mousetrap Car


* Mousetrap cars are a wonderful for teaching force and motion, I would mention Newton’s Laws of Motion especially the first law relating to getting an object at rest moving.  

Large Drive Wheel Mousetrap Car


* I would demonstrate mousetrap cars with long lever arms which moved slowly, cars with short leverage arms were much faster, and a mousetrap car with a very large drive wheel is also slower.

Start of Mousetrap Car Race

* There would be a mousetrap car race between two cars. By attaching a length of yarn to mousetrap car, a person sitting could easily release the car.

Bill Kuhl
http://www.ideas-inspire.com

Related Links

http://www.docfizzix.com

http://ideas-inspire.com/mousetrap-cars/

http://scienceguyorg.blogspot.com/2013/04/little-bit-about-my-father.html
http://scienceguyorg.blogspot.com/2014/02/pitching-your-idea-before-shark-tank.html
http://scienceguyorg.blogspot.com/2013/05/alden-balmer-doc-fizzix.html 
http://scienceguyorg.blogspot.com/2017/07/college-for-kids-2017-wound-up.html
http://scienceguyorg.blogspot.com/2014/02/mousetrap-car-progression-of-ideas.html
http://scienceguyorg.blogspot.com/2014/03/torque-and-lever-arm-calculations-for.html

http://scienceguyorg.blogspot.com/2014/12/newtons-laws-and-hybrid-car.html