I am building the 104" wingspan Piper Cub. Going gas engine. What size gas engine for this plane? Like it to be a little over-powered.


thanks for the help.


Waddie

I have a Bill Hempel 1/4 scale L4 with 105" wingspan. I used the DLE 55RA for the powerplant. Another club member went with the DTL 35RA for the same plane and it flies more scale where as I have way more power. Either will fly it but the 55 would give you the edge on power.

Something 4 stroke and multi cylinder. Hold a gun to my head and make me install a 2 cycle single cylinder in a scale plane and I'll fly the plane straight into a tree. Nothing worse than a well built scale war bird with an ugly single cylinder hanging out under the cowling.

helps to include things like projected finished weight and altitude at which you fly. A friend has a 96 in Decathlon with a DLE 55RA and it's pretty spirited. At that size a 35 is a bit small.

I have the H9 X Cub which is 116 in, and it has a DA 70. It's not an installation that would warm the heart of a scale enthusiast.

What kit? A light build will fly great with a 35. A heavy build will fly ok with a 50. A light build with a 50 can/will become kindling if you don’t reinforce it in the right areas. Most small gas four strokes are best suited as paper weights.

Really! 50cc engines on 1/4 scale Cubs.....
The 3 1/4 scale Cubs I had all flew great on DLE-20's and had plenty of power. Flew most of the flight, including take-off, at half throttle and would loop from level flight. Had a good friend with a 1/4 scale Cub on floats that he flew for years on an old, worn out G-23 and it flew well.
Does a 20" prop on a 50 cc engine even clear the ground on a 1/4 scale Cub?????

Originally Posted by dhal22

Something 4 stroke and multi cylinder. Hold a gun to my head and make me install a 2 cycle single cylinder in a scale plane and I'll fly the plane straight into a tree. Nothing worse than a well built scale war bird with an ugly single cylinder hanging out under the cowling.

99 out of 100 warbirds have 2 strokes and the cylinder heads comming out of the bottom! I dont think anyone is gonna hold a gun to your head.. what would you put in a TF Mustang, or a Spitfire?

Eflite Power 160 on 10s. You will not be disappointed!! Been flying a 1/4 scale Dave Patrick arf on floats for a few years. The engine never quits and when you pull the throttle all the way back it actually descends.

Originally Posted by ROBNBAY

Eflite Power 160 on 10s. You will not be disappointed!! Been flying a 1/4 scale Dave Patrick arf on floats for a few years. The engine never quits and when you pull the throttle all the way back it actually descends.

No way!! The price of batts and a good charger would break the bank..

Originally Posted by 3DJP

99 out of 100 warbirds have 2 strokes and the cylinder heads comming out of the bottom! I dont think anyone is gonna hold a gun to your head.. what would you put in a TF Mustang, or a Spitfire?

All that hard work to get to authentic scale reproduction at the field/ in the air and it is ruined with a 2 stoke.

Kolm..... Valach..... Moki..... Roto......

Originally Posted by dhal22

All that hard work to get to authentic scale reproduction at the field/ in the air and it is ruined with a 2 stoke.

Kolm..... Valach..... Moki..... Roto......

Well spoken sir 😊

I have to laugh at the constant gas 4 stroke comments you guys make.. How many do you own? I have had several and in general POS comes to mind. 3x the cost , 2x the weight, 1/2 the power, plus tons of maintenance compared to a two stroke.. The only one i have kept is my 250 moki asI have a 1/3 scale stearman for it.. If I want to listen to sweet sounds I will stay home and play my stereo.. for reliable flying fun get a good two stroke gasser.

My current build is a 1/3 scale Cub and will be powered with a gas burning Kavan 50cc 4 stroke.

Originally Posted by 2walla

I have to laugh at the constant gas 4 stroke comments you guys make.. How many do you own? I have had several and in general POS comes to mind. 3x the cost , 2x the weight, 1/2 the power, plus tons of maintenance compared to a two stroke.. The only one i have kept is my 250 moki asI have a 1/3 scale stearman for it.. If I want to listen to sweet sounds I will stay home and play my stereo.. for reliable flying fun get a good two stroke gasser.

You are saying that Kolms and Valachs are POS's or you bought other brand POS's?

I have to laugh at people who don't appreciate the final step to scale building. This is a POS? Underpowered?

The Galloping Ghost - Perfect Set Up - Kolm Engine 4 cylinder (3 min 17 sec)

A single cylinder 2 stroke with a cheap muffler is a horrible thing to do to a Mustang/Spitfire/109, etc, etc.

As yours, just my opinion btw.