mrad128

My Feedback: (6)

Anybody have an idea if this plane/motor combination works?

Hill202

My Feedback: (24)

well, i have an H9 Cub 80" wingspan with a saito 65 and it is somewhat overpowered. I believe a 91 is too much.

mrad128

My Feedback: (6)

Thanks! That actually makes sense as the most recommended engine I've seen for this plane is the OS 70 4-stroke, which seemed like a powerful engine for the plane. I just thought I heard of someone who used a 91, and that happens to be the only engine I have currently without buying something else.

Thanks,
Mike

Meesh

My Feedback: (135)

My buddy had the Saito 90 twin in his. Took off at half throttle, flew at 1/3 throttle. Fuul throttle on take of and it would do nothing but ground loop.

waagbuck

My Feedback: (1)

I had one with an os 70 four stroke - it was perfect. I think a 91 would be too much.

mrad128

My Feedback: (6)

If the weight is not too much....at what point do you think too much power is a bad situation?

yard-dart

My Feedback: (35)

I don't know if your talking about this plane (Cub) or not, but IMHO there is a breaking point when it comes to too much engine. Take for instance a .40 sized cub. You "can" put a .91 four stroke on the nose of it and it ballance out just fine, but the power of the engine is going to stress the airframe. Number one, you don't need that much power on a .40 sized cub for it to fly comfortably, or even at higher speeds. Number two, you're wasting a perfectly good .91. Nobody in their right mind is going to use "all" of the .91 on a Cub. Put the .91 on a plane that "needs" the power of the .91. A .40 sized cub will fly comfortably with a .50 sized four stroke. Keep in mind that a Cub is a "slow" flyer, so it doesn't need all that extra power.

Just my opinion,

John

mrad128

My Feedback: (6)

John, thanks much..... I just could not get past that 80" wingspan ...... the .91 was from a 70" span Chipmunk.....so I just had a tough time thinking a 40 cub with all that wingspan would be that overpowered. But from what I read, like you said, the cub flies comfortably with much smaller 4-stroke engines.....

Thanks for your input!

SkyDude

I have an OS .91 four stroke on my GP Cub J-3 ARF and it works fine. Plenty of power, but I'll need that when I use the floats.

Do a search on "GP Cub J-3 ARF", there are several posts on this plane. I've replied to at least 4 of them with my experiences.

polstery

Look at it this way guys. You can always throttle back BUT you can't always throttle up

EMCalvin

I am enjoying all this information. I am a raw beginner. Just ordered a GP 40 cub kit and it isn't here yet. I don't have an engine yet. The manual says it needs a special "slimline" muffler to be contained in the cowl.

Is this a normal option with anybody's engine, or do I need to stick with OS who seems to have that kind of muffler?

(And ... starting from scratch ... what engine would you recommend? Right now I am still having trouble landing the simulator!!!)

Meesh

My Feedback: (135)

This plane flies better in real life than it does on the simulator. I can't land it without damaging it on the Sim

ICE_MAN

Guy at our field has a clipped wing 0 sized with a .91 in it. I'd imagine if you wanted you could have a friend hold it give it power and it'd fly otta your hand. get a 50-65 4 stroker. I've heard nuthing but good from those rcv <?> engines. Sound good too.

EMCalvin

Thanks for the help and info. But ... what about the muffler question?

The kit calls for a slimline muffler which exhausts below the cowl. Looking through the Tower catalog, the only one I see is the OS engine where I could order a slimline muffler.

Are mufflers a "one size fits all" deal, or does every engine have a slimline style muffler option, or do you experienced folks use a regular muffler, and then where do you put it? or what??

crashland 73

My Feedback: (24)

I have a Saito 72 on mine and I know it is more than it needs. I fly it slow and that 72 helps it leap off the ground and if I am needing a sudden burst of power it has more than enough.

Sprocket1

The slimline Pitts will stick out slightly below the engine cowl. The motor will be mounted on its' side. Be sure and order a couple of 4-40 x 1-1/2" bolts too. (Tower part no. LxJ976 I think.) The muffler is part no. LxF685 I think. BTW, the Pitts muffler will make the cub look like it has buck teeth when you look at it from the front. I have a .46 Tower in mine and it is way more than enough power.

dhable

My Feedback: (3)

Sprocket1-

How did you fit the smaller Tower .46 into the ARF-supplied motor mount? I wanted to use an OS .46 FX on my cub, but I can't get the motor mount arms close enough to fit the mounting template (despite the fact that GP recommends the OS .46FX.)

I finally decided to go with an OS .61FX. I know that's way more power than I need, but I figured I could "prop the power down". (I'll add a pitts muffler.)

I even tried to replace the motor mount with a .40-sized GP motor mount, but it was too late, I'd already drilled for the supplied .60-size-mount.

Thanks in advance for any answer you might have.

deadduk

I need a little help wit this Plane myself. I just bought the Cub Piper Great Plains ARF and I want to put my O.S. 56 4 stroke on it. Is this engine going to provide enough power for quick take offs and will it be enough power to take off with the floats on this plane or should I put a Saito 72 on it for water take-offs? Thanks for any advise

Dano13

Please tell, what prop size/brand are you using? While mine (still in the build stage) is not the same as what is being discussed here, it is rated for a .40 - .46 two stroke. I have a TT .46 pro I plane to use.

TIA

dano13

Sprocket1

I'm using TF 11"x6 props. I want to emphasize props, too. After your first ground loop you will know why. I had to "slightly modify" the motor mount with a dremel tool to make the motor fit correctly. Since my post I have replaced the Tower .46 with an O.S. 46 that was salvaged from a hole in the field that I made while trying to hover another plane upside down. I have to send the Tower back and see why it dies for no apparant reason a little above half throttle.

SkyDude

I used the stock muffler on the OS .91 and it requires some cowl cutting to get clearance.

The .91 is a lot of motor for this plane, but it still flys very well. Taking off is another story, it loves to ground loop and my only reliable method is to hold a bit of left rudder and slowly advance the throttle. I still have to abort about a quarter of take-off attempts, but that's a lot better that what I did a couple times and had it g-loop just before it was airborne.

I still haven't tried the floats on it, but that may change by the end of this month.

I'm using a 14x6 prop.

jcilia

Guys,

I'm flying the TT 82inch Piper Cub with .61 ASP 4FS and it has more then enough power in fact it flies mostly at half throttle.

regards

John_RedSox

My Feedback: (75)

Why would you want to cut so much cowl just to put a big motor in it? What ever happened to flying "Scale" which perfect for a cub? I have a OS 52 in mine and it is perfect.

John

Meesh

My Feedback: (135)

I agree John,

I have a Saito 60 twin in mine and it is more than enough power. I even think it would fly off of floats with this engine. The OS 91 is WAY too much engine for this plane.

Bob

hgiles

My Feedback: (4)

Keep in mind also, a lot of your flying with the cub will be with the left stick (rudder). If that stick is way down it could be difficult to control, especially if your other planes are flown with the stick way up. The orientation could throw you.

Seems like a miniscule concern, but comfort and familiarity mean a lot when your flying expensive planes.

BTW, my H9 80" cub flies fast, fast on a Saito 56. It would probably fly on floats just as well.