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Author Topic: foamboard electric trainer by Bob Hunt?  (Read 344 times)

Offline Brian Courtice

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foamboard electric trainer by Bob Hunt?
« on: January 14, 2022, 08:33:44 PM »
Is there a plan and/or a build article for this nice looking foamie stunt trainer anywhere?
https://www.theparkpilot.org/ControlLine0208


Online Mark wood

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Re: foamboard electric trainer by Bob Hunt?
« Reply #1 on: January 14, 2022, 10:27:09 PM »
Looks pretty simple to just cut by hand. Our local FF club which 50% are also part of our local CL club have secured an indoor flying sight and I have finished cutting several of Igor Burgers  Indoor GeeBee models. We are going to be doing lots of flying soon. I'll post some information on our activities when that happens including a build thread.

Igor's model

https://stunthanger.com/smf/gettin-all-amp'ed-up!/early-christmas-)))))/
Life is good AMA 1488
Why do we fly? We are practicing, you might say, what it means to be alive...  -Richard Bach
“Physics is like sex: sure, it may give some practical results, but that’s not why we do it.” – Richard P. Feynman

Offline Brian Courtice

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Re: foamboard electric trainer by Bob Hunt?
« Reply #2 on: January 15, 2022, 07:41:18 AM »
I think I could draw a plan from that picture. Is that about 250 sq in?


Motorman 8)

Yep it should be pretty simple to copy. . All I really need is the wingspan and specs on the motor.

Online Mark wood

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Re: foamboard electric trainer by Bob Hunt?
« Reply #3 on: January 15, 2022, 08:16:02 AM »
Yep it should be pretty simple to copy. . All I really need is the wingspan and specs on the motor.

Or maybe send Bob a PM. He's a nice guy to talk to and is super helpful. If he has a pdf of the plans, he'll likely send it to you.

I just sent him an email.
Life is good AMA 1488
Why do we fly? We are practicing, you might say, what it means to be alive...  -Richard Bach
“Physics is like sex: sure, it may give some practical results, but that’s not why we do it.” – Richard P. Feynman

Online Bob Hunt

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Re: foamboard electric trainer by Bob Hunt?
« Reply #4 on: January 15, 2022, 10:26:13 AM »
Hi Guys:

Dick Sarpolus used to come up to my home with his fleet of foamies and we would spend the day in my back yard flying them. At that time I had a column in AMA's Park Pilot magazine dealing with small CL foam board planes. I told Dick that we should co-design a model that could be presented in that rag as a construction feature. He came up bright and early one morning and we put a clean sheet of paper on the old drawing board (yes, that's how I still design my planes...) and started laying out a model that had looks similar to a Bearcat. We called that model the Park Cat. After the drawing was done (about fifteen minutes...), we started cutting the Depron foam, plywood, and spruce parts for the model. It was all glued together with 5-minute epoxy in about an hour, and then we installed the motor, ESC, Hubin timer, and  battery. We ended the day by test flying the ship, and it was a total success. I was able to do the entire pattern with the model and even lay on my back and do square overhead eights. In fact, that model would - and still does - perform any maneuver I could think of and do it with pretty good precision. I still fly it often in the back yard.

Plans for that model should still be available from the AMA plans department. If not, I have a PDF of it. Please check with AMA first because it is their property.

Later - Bob Hunt



Later - Bob Hunt

Offline Brian Courtice

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Re: foamboard electric trainer by Bob Hunt?
« Reply #5 on: January 15, 2022, 02:50:41 PM »
Thanks Bob!
I'm not surprised to find out that Dick Sarpolus had something to do with it. Everything Dick designs is simple, elegant, good looking, and perfectly suited to it's intended purpose.
I can probably manage to sketch up something pretty similar.
If you wouldn't mind, could you measure the wingspan, and have a look at exactly what motor was used?

Offline Brian Courtice

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Re: foamboard electric trainer by Bob Hunt?
« Reply #6 on: January 15, 2022, 03:11:33 PM »
A quick google search for "Dick Sarpolus 1/2A" yielded an article for a very similar R/C design by Dick (with a PDF) for a blue foam version.
https://www.theparkpilot.org/akro




Online Dennis Toth

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Re: foamboard electric trainer by Bob Hunt?
« Reply #7 on: January 15, 2022, 03:12:41 PM »
Brian,
If you want something a little bigger here are the plans for an Aussie design call the Yardstick. It is a flat plate wing around a 15 -19 size engine and would also be a great electric.

Best,    DennisT

Offline Brian Courtice

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Re: foamboard electric trainer by Bob Hunt?
« Reply #8 on: January 15, 2022, 03:25:55 PM »


Plans for that model should still be available from the AMA plans department. If not, I have a PDF of it. Please check with AMA first because it is their property.

Later - Bob Hunt

Do you recall what the name of the model is, so I can search for the plan? Thanks again.



Later - Bob Hunt
[/quote]

Offline Brian Courtice

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Re: foamboard electric trainer by Bob Hunt?
« Reply #9 on: January 15, 2022, 03:38:13 PM »
I think I may have I found it.
The AMA plan is called the Foamy Skyraider.
The planform is different but the construction looks the same.
There is a free copy of the construction article here:|

https://plans.modelaircraft.org/wp-content/uploads/pdf/MA00980MA1.pdf

« Last Edit: January 15, 2022, 04:25:34 PM by Brian Courtice »

Offline Brian Courtice

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Re: foamboard electric trainer by Bob Hunt?
« Reply #10 on: January 15, 2022, 04:20:20 PM »
Brian,
If you want something a little bigger here are the plans for an Aussie design call the Yardstick. It is a flat plate wing around a 15 -19 size engine and would also be a great electric.

Best,    DennisT

That looks great. I think I want to start with something a little smaller.
I've been an R/C flyer for almost 50 years, and I have tons of unused electric gear laying around.
Haven't flown control line in many years. I want something small and cheap to start out as I fully intend to destroy it learning loops eights and inverted flight as quickly as possible. :) I'm a pretty advanced 3D pilot, so we will see if my R/C skills will help me learn faster.

Online Dan McEntee

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Re: foamboard electric trainer by Bob Hunt?
« Reply #11 on: January 15, 2022, 05:38:49 PM »
    I have np doubt that the airplane you are looking at is everything that Bob says it is and does, and has the advantages that electric can bring to the table for learning the pattern. But you have to ask yourself, is that all you want to do with it??
   I volunteered at the KidVenture C/L circles for 16 years and about half way through that run, we were starting to run out if airplanes that could take the Timex Test, take a licking and keep on ticking! Bob Arata and I used to spend the long ride home talking about what to design and build, and the first thing that came to my mind was, I did NOT need to be capable of stunting, and that it had to survive a one point, Lawn Dart Landing in the hard ground at Pioneer Airport! We also decided that as few parts and components as possible were from the hobby shop because they are quickly vanishing from the face of the earth, but Hardware and Building Supply Stores are all over the place. We came up with our TuffBaby trainer that was built from Core-Plast plastic, yard sticks, and bamboo BBQ skewers and is designed as a Primary Flight Trainer. You can probably find out a lot about it by searching the forums here because I know I have typed out the story many times, and the plans may be in one of those threads, and if not, PM me and I will send them too you. The TuffBaby or (Tough Baby) was first introduced at Oshkosh in 2010 with 5 models and I think at least 4 of those are still in service, with the 5th once having had the flying surfaces replaced, which is one of the primary features of the airplane. It has a more or less indestructible fuselage with rubber band mounted engine (Norvel .061 ) and the flying surfaces are sandwiched in between the top and bottom of the fuselage and held together with four 4-40 screws. The airplane has some weight to it, which is desired in the winds they fly in at Oshkosh and also helps with line tension. It's not the prettiest airplane you ever saw but the beauty of it is that you could make it look like anything you want if that is desired also. It does have an IC engine but the Norvel is as tough as an anvil, and would restart with a small electric starter in an instant. The glow plugs are the toughest I have ever seen also. This airplane will stand up to the Timex Lawn Dart Test!
  Larry Renger and the crew from The Knights of the Round Circle came up with a neat looking electric trainer that is also built with Core-Plast plastic called the ET-1. Our club is going to build up a few of these this winter/spring. It's an electric pusher design that gets the motor and prop away from the nose on those inevitable crashes, and has tricycle landing gear for pavement take offs. The interesting feature of this airplane is they control the motor speed by radio from outside the circle. This has the advantage of this is to control the flight speed of course, and also the flight duration and if need be, cut power on a crash. This airplane is also just intended as a primary flight trainer and Larry and the Knights have had lots of success with it. I think you can probably find plans posted in a thread also. If not I have those also
     So in short, like any job you have to do, you usually make sure you have the right tool for the job! If it's primary flight training, choose accordingly. If the pilot can competently fly the airplane is comfortable in moving on to a more maneuverable model, then the Skyraider or something like it is the obvious choice. Each pilot is different and it can vary how soon they are ready t move along.  Above all, have some fun with it!

    Type at you later,
    Dan McEntee
   
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AMA 480405 (American Motorcyclist Association)

Offline Brian Courtice

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Re: foamboard electric trainer by Bob Hunt?
« Reply #12 on: January 15, 2022, 05:53:47 PM »
Thanks for the input. I appreciate it.
I did get a chance to try flying a basic electric control line trainer at the Joe Nall r/c event not too long ago.
I was immediately comfortable with basic circles, climbs and dives, and a simple wingover. I was tempted to try a loop, but it wasn't my airplane. I don't think I'll need to start with a primary trainer. I also might be wrong about that.  :)

My idea is to build something stunt capable that requires as little time or money invested as possible, and just go for it.
When I fly R/C I can fly inverted harrier circles, low to the ground rolling circles, inverted low passes, low level knife edges, etc.
I'm not fooling myself into thinking there won't be a steep learning curve transferring to control line, and I plan to crash/repair/repeat as needed.

Online Dan McEntee

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Re: foamboard electric trainer by Bob Hunt?
« Reply #13 on: January 15, 2022, 06:36:36 PM »
Thanks for the input. I appreciate it.
I did get a chance to try flying a basic electric control line trainer at the Joe Nall r/c event not too long ago.
I was immediately comfortable with basic circles, climbs and dives, and a simple wingover. I was tempted to try a loop, but it wasn't my airplane. I don't think I'll need to start with a primary trainer. I also might be wrong about that.  :)

My idea is to build something stunt capable that requires as little time or money invested as possible, and just go for it.
When I fly R/C I can fly inverted harrier circles, low to the ground rolling circles, inverted low passes, low level knife edges, etc.
I'm not fooling myself into thinking there won't be a steep learning curve transferring to control line, and I plan to crash/repair/repeat as needed.

   Hi Brian;
    Like I mentioned, everyone is different when it comes to control line flying. It's my opinion that the only thing R/C can prepare you for is anticipating control responses. Control line flying is so much more close in and it seems like thing happen faster.Your brain is directly connected to the airplane by your hand and lines so things happen right now. When you are flying the R/C maneuvers, are any of those augmented by transmitter presets? There isn't any of that flying C/L stunt. When I explain what my attraction to C/L stunt is to people, I tell them it's as close to what it's like flying an airplane as you can come and still have your feet on the ground. So, you know more than anyone what you might be ready for, so, like you said, go for it!! And most of all HAVE FUN WITH IT!
   Type at you later,
   Dan McEntee
AMA 28784
EAA  1038824
AMA 480405 (American Motorcyclist Association)

Online Ken Culbertson

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Re: foamboard electric trainer by Bob Hunt?
« Reply #14 on: January 15, 2022, 09:32:54 PM »
That looks great. I think I want to start with something a little smaller.
I've been an R/C flyer for almost 50 years, and I have tons of unused electric gear laying around.
Haven't flown control line in many years. I want something small and cheap to start out as I fully intend to destroy it learning loops eights and inverted flight as quickly as possible. :) I'm a pretty advanced 3D pilot, so we will see if my R/C skills will help me learn faster.
I am willing to bet that a lot of your skills will transfer, especially the most important one (to me anyway) of not having to think which way to move the controls upright or inverted.  You have been doing that on two plains simultaneously, now you will only have to do it on one. :)  The one you will miss the most is throttle.  You can't power yourself out of a jam. :(

Ken

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