Flying freak

Hello,



I will shortly be building an altra sport 40 this will be my first kit so expect it to be on the heavy side there will be digital servos for everything i plan on using it for both 3d and parrern I would like to get a four stroke,



any suggestions?



Steven

RCKen

My Feedback: (9)

OS 46 AX is more than enough power for this plane. But don't plan on doing 3D with it, it's not designed for that and won't do very well at all. On the other hand, for pattern it's a fantastic ship.

Ken

Flying freak

Ok so then il use it as a pattern plane (heres the thing i love the hobby im new but i dont really know what way i would like to go so im building a nice aerobatic plane (ultra sport) and im building an old pylon kit frm there i will decide which was i would like to go in the futur)

umm i would really like to put a four storke in there.. how does a saito .82 sound to you guys?

Steven

felker14

My Feedback: (50)

My vote would be YS-63 4 stroke or OS-55 2 stroke.

fredscz

My Feedback: (47)

I fly mine with an OS 46 FX and another club member flys one with an OS70Surpass. An 82 Saito would be plenty without weighing a ton.
Fred

Flying freak

[quote]ORIGINAL: felker14

My vote would be YS-63 4 stroke or OS-55 2 stroke.
[/quote






Ca i run a ys on power master sport fuel
-15% nitro
-18% oil (half castor half syth)

Steven

RCKen

My Feedback: (9)

You can run it on that fuel, but you'd be better off with a higher percentage nitro fuel. The YS's like 20%-30% nitro, and run better with that fuel. But you'll be ok with what you have.

Ken

Flying freak

I had anotherr idea..

how about i build the plane finish rtf minus the motor and try and balance it obvoulsy it will be tail heavy (no eninge) i then slowly add wight (ziplock bag wedged in the motor mount with soe srewes as wightt) once i get enough screws in the bag for the plane to balance i wight this and look for an engine that wight about that form there i can go..

is this a good idea or am i REALLY tired?

submikester

My Feedback: (6)

Saito 82 will be more than enough engine for it. The other suggestions are also good but if you like the 82 go with your gut.

Flying freak

I had anotherr idea..

how about i build the plane finish rtf minus the motor and try and balance it obvoulsy it will be tail heavy (no eninge) i then slowly add wight (ziplock bag wedged in the motor mount with soe srewes as wightt) once i get enough screws in the bag for the plane to balance i wight this and look for an engine that wight about that form there i can go..

is this a good idea or am i REALLY tired?

MinnFlyer

My Feedback: (4)

The plane will probably balance better with a 46 2-stroke.

But if you go with a 4-stroke, you could always move the battery back into the tail

jzinckgra

My Feedback: (11)

I'm running a Fox 50 in mine, FWIW.

FlyingGreg

My Feedback: (4)

Freak--

I have a Tower Kaos, 40size, that I added turtle deck to--it looks just like an Ultra Sport. I would't be surprised if they were the same plane. The Kaos kit came with formers for the turtledeck, but I had to provide the sheeting. Cut a Chipmonk canopyin half that was alying around. Engine mounted upright and just wood cheeks for cowl, but still looks pretty "Ultra Sport like." I prefer two stroke motors on these planes, although they fly fine with four strokers. I have a YS-45 w/ tuned pipe on mine and it flies very well. Good luck.

RCKen

My Feedback: (9)

FlyingGreg,
You're not too far off. The Ultra Sport and the Kaos have the same wing on them. So yes, they are quite a bit alike.

Ken

felker14

My Feedback: (50)

In my YS's I have only run Power Master 20/20 so not for sure on sport mixture for YS but for the OS it would be fine. Let us know what you decide.

FlyingGreg

My Feedback: (4)

I have only the one YS, a two stroker and puts out plenty of power with tuned pipe and Wildcat 15% nitro/18% synthetic oil --it's what I use in all my engines.

Flying freak

What would you suggest as for retracs i know nothign about them I fly JR if that helps with what servos and what other gear i will need.