asaad_civic99

Hi,

I have an OS 46 LA engine that I originally bought for a 40 size trainer. Unfortuantely my LHS - which is the only one in my country - ran out of 40 size trainers and has 60 size trainers (70" wing span). I know that some 70" trainers can be flown on 46 size engines like the tower trainer 60.

If I try to fly a 60 size plane with a 46 size engine, will I eventually crash the plane? or It will only need more runway for takeoffs and more throttle to keep it airborne?

TedMo

You probably will not have much trouble flying the larger plane, since present 46 engines are very powerful and trainers are docile. Go to it and enjoy.

novatubbed

My Feedback: (13)

i fly a 78 inch piper cub with a .40  it is no speed demon but flys very nice with a 10-6 prop

LargeScale88

I flew my SIg kadet lt 40 (70" wingspan) many many years ago wheni started flying with an os 46. A 10-6 flew it almost 2 fast, and I had a pound of lead in the fron for balance because I fiberglassed the fuse.

It should be plenty of power.

Jason

thailazer

You should be fine with the 46 as long as the trainer is not too heavy. Here's a video of my Tower Hobbies Trainer 40 with a modified 82 inch wing and powered by an OS 25 on it. The bigger wing made the model a lot more docile and faster on take-offs.

http://www.youtube.com/watch?v=4EkaU9emYWU

One thing you might want to do is be prepared to move your battery back and forth to get the center-of-gravity in the right place.

big max 1935

My Feedback: (9)

It should do OK . You might play with the props & use a fuel with a little more nitro. I would fly it first & go from there. Might try a 11X5 or 12X4 prop & 15% nitro . Good luck ,Max H.

ES CONTROL

LA Engines like long props, and not to much pitch.

Ed_Moorman

My Feedback: (1)

You'll be fine with an OS .46LA in a 60 sized trainer. Most trainers are very over powered anyway. Your 60-size trainer will have plenty of lift and will probably be easier to fly than the smaller version. As someone else suggested, I'd use an 11-5 prop.

Try to keep the tail as light as possible. The OS is fairly light, so you may end up tail heavy. You might consider a smaller tank as the 60-size tank will be over size. Then you can put a flat pack battery under the tank. This may help you get the CG correct without adding lead. I would shoot for a CG on the main spar and not for the forward edge of the CG in the instructions.

asaad_civic99

Thanks guys for your advise. I will let you know the results in a couple of weeks.

jester_s1

Like any plane with the horsepower toward the lower end, you can expect it to be more wind sensitive and prone to stalling with more difficult stall recoveries. Longer takeoff runs as previously mentioned are to be expected as well. The biggest aggravation will be if you go out and fly on a gusty wind day, a blast of wind will hit the nose and raise it, slowing your plane at the same time thus setting it up to stall. Good piloting responds by pushing the nose back down, but it is nice to have some extra power on tap for when you forget to.

acejinx

I like underpowered planes. Not all of mine but once in a while it's nice. It's easier for a beginner to keep the motor running if you don't have long periods of idling. Oh, it's easier for the expert too. Plus a little bit of weight really makes a big difference.

Aerobat152

My Feedback: (5)

Gentlemen, I would like an opinion(s) as to whether a .46 size engine with a 10-6 prop would fly an 81" ARF cub instead of a .60 engine. I am using 18% nitro. on a grass field. Any response would be helpful since I'm fairly new to the sport of RC. Flying

thailazer

Aerobat.... That will depend on how heavy the cub is. Most likely it will unless it is very heavy. Larger wings are more efficient than smaller ones, especially if they have a high aspect ratio (span/chord) like a standard cub has. What is the weight of your cub?

Gray Beard

My Feedback: (-1)

The prop question is a test and find out thing. Most of my planes I have had in the past with the .46 flew better with a low pitched 11 inch APC. Only testing will tell? At the moment I am just finishing up a 40 size 72 inch wing CG Cub for a friend. It's a very heavy little Cub and I'm not a weight watcher. I don't think I would use a .46 at all on this plane. I would be looking at the .70 four stroke or a .60 two stroke. In this case it is a float plane and the owner is using a OS .91 four stroke, he would be using a .70 but he doesn't have one. I once had the GP Cub of the same size and the .46 was just fine. As Thail said, weight is a key factor. This one is a PIG!!!!!!