GP .40 J-3 Cub on Floats - RCCanada - Canada Radio Controlled Hobby Forum
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Old 01-07-2008, 11:01 AM   #1
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GP .40 J-3 Cub on Floats

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So For Christmas my in-laws bought me a very nice Great Planes .40 size J-3 Cub kit. I want to run it on a set of GP .40 sized floats too. MY question is... what to power it with?

Any suggestions?
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Old 01-07-2008, 11:37 AM   #2
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I had the GP cub and installed a Super Tiger GS.45 with a Pitts muffler. I had a set of Goldberg cub floats and a set of home made skis, and I flew that think all year long!
The power was more than enough and I had installed a bit bigger fuel tank for longer flights.
I had that plane for several years, and I put 8 or 10 gallons of fuel through it, I adjust the carb twice a year, once in spring, for summer flying and once in the winter, for ski flying. the reliability was great!
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Old 01-07-2008, 02:11 PM   #3
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A Thunder Tiger .46 was ample power when I had Mine.
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Old 01-07-2008, 02:30 PM   #4
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Hello Kristoph:

Nice in-laws! I'm looking at the same outfit, GP Cub on floats or perhaps a Hanger 9 Cub on floats. I live on a lake and to keep the neighbors happy I plan to go electric. Have you considered that type of power? Electric power is certainly more expensive - .40 size motor/speed control approx $280.00 versus a $150.00 glow engine - but, its nice and quite and very clean. I happen to have an AXI 4130/20 and matching Jeti speed controller in my workshop, so I only need to purchase the rather expensive battery and I'm all set.

Good luck with your decision.

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Old 01-07-2008, 03:34 PM   #5
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What would be ideal would be a .56 four stroke (both OS and Saito offer them) if you can afford it, the prices will never be lower than they are right now.....
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Old 01-08-2008, 10:59 PM   #6
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I have a OS .60 in the H9 cub with the largest recommended prop and it allows for a nice scale-like take off. The only downfall is the noise, the trees and the water at the cottage are a natural amplifier so if I could suggest a 4 stroke should be a consideration. Also if you buy the fiberglass floats from hangar 9 make sure you seal the area where the pushrod exits the back of the float (to the rudder). The little grommet they send with the kit does not quite cut it. I took the float servo apart and sealed it with gasket silicon as well.

My 2 cents, and Its a blast when they come up and are on step before take off, and settling in after touch down. Good luck!

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Old 01-09-2008, 06:02 AM   #7
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I have the same plane & floats, I first started with a TT Pro 46 and 12X4 APC. Seem to be ok, enough power. Later switched to a Saito 65 which seemed better at low speed. Might want to consider Slocan floats they are foam and are a lighter than balsa.

Good Luck

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Old 01-15-2008, 12:34 AM   #8
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I'm doing an Adrian Page 80in cub on floats and am going to go electric so that I can fly in the early morning and evening, when it's nice and calm, without making everyone upset about the noise. I'm going to go with the large Torque outrunner and Elite Airboss ESC from The combo is on for around $200 (us) and will provide ample power for floats. The elite ESC also has a built-in switching BEC that can be used with 4 - 5 cell lipos, so an external one or a seperat Rx battery pack won't be needed. I'm sure that I'll be able to get enough watts with two 2100 4 cell packs in parallel or possibly even 3 cell packs. Another option with this motor is the A123 cells. This electric setup won't be alot more than going glow and will allow alot more oppertunities to fly. -Greg
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