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Dynaflite Super Cub Gas Engine Rec

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Dynaflite Super Cub Gas Engine Rec

Old 04-26-2011, 05:06 PM
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Default Dynaflite Super Cub Gas Engine Rec

I have a partially completed dynaflite Super Cub. I want to put a gas engine on this plane. what are your recommendations?

Thanks,
Chris
Old 04-26-2011, 05:11 PM
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Default RE: Dynaflite Super Cub Gas Engine Rec

What is weight and wing span, 1/4 or 1/3 scale ?
Old 04-26-2011, 05:20 PM
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Default RE: Dynaflite Super Cub Gas Engine Rec

well, it is not done yet, so i don't know the weight. It is a 1/4 scale, 104" wing span
Old 04-26-2011, 05:24 PM
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Default RE: Dynaflite Super Cub Gas Engine Rec

I would think a G26 should fly it fine. I have two G26's, one in my 110"Rascal and the other in a 100" SR Eindecker
Old 04-27-2011, 07:57 AM
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Default RE: Dynaflite Super Cub Gas Engine Rec

It will probably come in at 15-16lbs. I had a similar model with an OS 120 4 stroke, that was marginal power.
Old 04-27-2011, 08:02 PM
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Default RE: Dynaflite Super Cub Gas Engine Rec

Hi Chris,

Here are the specs right off the kit box cover. I picked this up last year right here on RCU. I always wanted this kit, too bad Dynaflite discontinued it.
I think Model Airplane News did a review on it about 10 years ago or so. Hope this helps you out.

The Best
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Old 05-04-2011, 04:07 AM
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Default RE: Dynaflite Super Cub Gas Engine Rec

I found a (poorly built) one last year (never flown), stripped it and finished most of it over again (leading edges not sanded/rounded, firewall covered with almost two pounds of lead shot/bars glued on...quite a mess). I re-finished the aircraft in a "U.S. Navy" finish and installed a DLE-30 engine. It's a heavy airplane.

As you can see in the photos, I made a larger (1/2") sub firewall, extended from the main firewall, along with the usual DLE-30 standoffs. I'm using a Fiberglass Specialties Super Cub cowl. The cowl and engine extends a little further out than stock, but with this setup, along with three servos in the tail (two-elevator, one-rudder), no lead is needed in the nose. Have a 20 oz. fuel tank in the cabin just ahead of the CG and can place 2100 or 3200 Mah LiFe batteries anywhere directly under the CG or forward if you wish. Have flown it four times (the last flight last night), getting it trimmed out. Lots of power from the DLE-30, spinning an 18X6 Xoar prop. Finished in flat grey Monokote with spray enamel trim and lettering cut out on trim Monokote sheets.
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Old 05-04-2011, 04:13 AM
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Default RE: Dynaflite Super Cub Gas Engine Rec

Here are a couple more photos.

As for flying qualities so far, lots of right rudder is needed on takeoff. Significant adverse yaw on right aileron application, so keep kicking the rudder in. With the engine a little further forward than stock, there's more of a moment-arm which leads to accentuated left-turning tendencies with the application of power (torque and p-factor). Flies much heavier than a stock quarter scale Cub, such as the Hangar 9, which I also have with a Zenoah 20. Also have an Aeroworks Sport Cub with a DLE-50, but haven't maidened that one yet.

Flaps work wonders to help slow-down the landing approach, but you can tell that this Super Cub doesn't like flying real "lazily" as the H-9 J-3 does. I think that's a function of the weight of this bird, at least in the configuration I have it.
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Old 05-11-2011, 06:23 PM
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Default RE: Dynaflite Super Cub Gas Engine Rec

Hey PlaneJaw,

What did you use for struts? I have this kit up in the attic with an OS 160 twin sitting on the shelf. Maybe my DLE 30 would be a better match.
Old 05-17-2011, 03:08 AM
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Default RE: Dynaflite Super Cub Gas Engine Rec

The struts appear to be the hardwood struts that came with the kit. They're epoxied and fiberglassed where joined. I also added some resin/micro balloons to fill the joint so they come together in a nice, smooth joint.

The DLE-30 is a great engine and lots of power. You do have to use an extended firewall, however, as the normal mounting for the DLE-30 on the standoffs, would not have solid plywood to mount to, the way that the front of the airplane is built, so the engine and cowl is extended a little further out than is scale, but it also means that no lead is needed for balance, even with three servos in the tail. I've got six flights on mine so far and there's plenty of power. Make sure you get plenty of down and right thrust built in, as the engine, extended further forward, has a greater moment arm requiring more right rudder on takeoff. She'll also want to climb under power, as the stock firewall, as built, has little down or right thrust built in...at least that's how mine was. Of course, mine was constructed poorly, so I had a lot of modifications to make to get it flyable. She's a heavy bird.

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