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Old Jan 11, 2011, 09:04 PM
Geoff Dryer is offline
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50% Electric J3 Cub (Clipped Wing)

It has been 30 years since I built my last plane from scratch, but I have decided to embark on building a Big Cub to be powered by a Hacker A-100.

Why?

I am fond of flying scale aircraft and I love flying my 25% RC Guys Decathlon. I have pondered something larger after first seeing video of the Hempel Cubs (http://www.billhempel.com/cub.html).

I would buy a Hempel Cub in a heartbeat but:

1) I do not own a 12 foot long trailer and I cannot see me getting that one by the wife. Also my garage is too short for a trailer. My workaround will be a two piece fuselage.

2) The Hempel Cub is designed to stand the rigors of a 150cc gas motor and is a little therefore a little bit heavier built than would be required for a 100cc equivalent electric motor.

3) I want the challenge of building most of the plane from scratch.


I have a good friend (a very good stick builder) who is going to work with me on the build. He has built several 25% and one 33% Balsa USA Cub. We have come up with a plan that incorporates the best features of both plans. I had a set of 25% plans blown up and printed at 200%

What

Here is my tentative plan:

50% scale clipped wing J3 Cub

- Wingspan: 180 inches (foam core wings)
- Wing chord: 32 inches
- Wing thickness: 3.75 inches
- Horizontal stabilizer span: 60 inches
- Fuselage length (2 piece): 134 inches (to front of cowl)
- Rudder height: 25 inches
- Total height: 42 inches (on 8.5 inch wheels)

- Hacker A-100 motor (7500 watts)
- Target weight: 50 pounds

Although this color scheme has been done my many others, I have always been fond of the Hazel Sig blue and white scheme. This was a true clipped wing J3 so this will be scale.

Have a read here (http://www.avweb.com/news/profiles/182140-1.html) to learn more about Hazel Sig.
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Old Jan 11, 2011, 09:15 PM
Geoff Dryer is offline
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Earlier I stated that my garage was too short for a full size cargo trailer. What I meant was that the door opening is only 7 feet high. Changing this involves spending a whole lot of money.

I current have a trailer box (8 ft x 4 ft x 3 ft high) that fits on a folding utility trailer. my plan is for that the two piece fuselage with removable horizontal stabilizers and folding landing gear should fit in this box.
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Old Jan 11, 2011, 09:42 PM
forevercat is offline
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sounds good! subscribed
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Old Jan 11, 2011, 11:02 PM
iflytailies is offline
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good luck with your project!

http://www.iflytailies.com/
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Last edited by iflytailies; Dec 18, 2011 at 02:09 PM.
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Old Jan 12, 2011, 08:18 AM
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Subscribed! I am working on my second 1/3 scale e-Cub (Hacker A60) and keep looking at the Hemple 50% Cubs - thinking that would be a great idea. I have a friend with a 50% plane, and it is big to transport and assemble - takes extra help and a trailer. The 1/3 Cub (144" span) will just fit in my mini van. You might look at the 12' Telemaster, which has the two piece fuse, to see how they do it.
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Old Jan 12, 2011, 10:01 AM
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Quote:
Originally Posted by Louierc View Post
Subscribed! I am working on my second 1/3 scale e-Cub (Hacker A60) and keep looking at the Hemple 50% Cubs - thinking that would be a great idea. I have a friend with a 50% plane, and it is big to transport and assemble - takes extra help and a trailer. The 1/3 Cub (144" span) will just fit in my mini van. You might look at the 12' Telemaster, which has the two piece fuse, to see how they do it.
I looked at the Telemaster and couple of other projects that use a joined fuselage. There is also a short thread here: http://www.rcgroups.com/forums/showt...ight=two+piece

I am planning on using plywood on each side and a short piece of carbon fiber tube with 4 bolts and blind nuts.
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Old Jan 12, 2011, 12:12 PM
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Geoff, I will be following along!! I have had a few thoughts myself of building a 40-50% supercub. I am finishing up on a 25% sc right now http://www.rcgroups.com/forums/showt...+scale+top+cub and was thinking the other day how much fun it would be to build one like this in a larger scale. At any rate good luck I will be watching from here on out!!

Trey
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Old Jan 12, 2011, 01:16 PM
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Quote:
Originally Posted by supercubman View Post
Geoff, I will be following along!! I have had a few thoughts myself of building a 40-50% supercub. I am finishing up on a 25% sc right now http://www.rcgroups.com/forums/showt...+scale+top+cub and was thinking the other day how much fun it would be to build one like this in a larger scale. At any rate good luck I will be watching from here on out!!

Trey
I had not seen your thread before. You skills show in the finished product!

I was interested in the CAD generated PA-18 instrument panel that you found. Can you point me to it?
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Old Jan 12, 2011, 01:58 PM
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Great project. Do a google for, wings and wheels 2009 Ali Machinchy half scale cub. I was there and the video does not do the flight justice. It is a Bill Hemple 50% c/w cub and uses a ZDZ 210cc engine and weighs 50lbs. It is obviously overpowered! At least you will not need to fit an onboard starter!
Good luck and every success with the project.
Chris.....UK
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Old Jan 12, 2011, 02:55 PM
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Quote:
Originally Posted by noblapod View Post
Great project. Do a google for, wings and wheels 2009 Ali Machinchy half scale cub. I was there and the video does not do the flight justice. It is a Bill Hemple 50% c/w cub and uses a ZDZ 210cc engine and weighs 50lbs. It is obviously overpowered! At least you will not need to fit an onboard starter!
Good luck and every success with the project.
Chris.....UK
I had actually seen that video before. OMG he really throws that Cub around. The announcer said that it was 70 lbs which sounds about right with a ZDZ 210.
Ali Machinchy - Half Scale Cub (7 min 47 sec)
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Old Jan 12, 2011, 02:59 PM
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Geoff, here it is...........

Trey


http://www.3pointaircraft.com/3point...ews/sc_pnl.gif
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Old Jan 12, 2011, 03:48 PM
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Quote:
Originally Posted by supercubman View Post
Thanks

This was the dash from the Cub that I visited. It was a lot simpler. (More pictures later)
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Old Jan 12, 2011, 06:03 PM
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This sounds fun Geoff. What spec batteries etc?

Rog
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Old Jan 12, 2011, 08:47 PM
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Quote:
Originally Posted by Sutton Bank View Post
This sounds fun Geoff. What spec batteries etc?
Rog
Electronics

Hacker A100-10 motor (27x10 Xoar propeller)
Hacker Masterspin 170 speed controller
4 x 6S 5800 mAh Turnigy 30C batteries (12Sx2P)

Ailerons (2 per side) Hitec HS-7950TH (400 oz inch @ 6V)
Elevator (1 per half) Hitec HS-7950TH (400 oz inch @ 6V)
Rudder Hitec HS-7980TH (500 oz inch @ 6V)

2 x Duralite 2300 mAh A123 batteries
Smart-Fly EQ-10 power expander
Smart-Fly pin and flag failsafe switch
Hitec Optima 9 receiver
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Old Jan 13, 2011, 04:46 AM
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Thanks Geoff. What do you use to charge 4 x 6S LiPo's?

Rog
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