bgwatson

I have a profile plane with a 48" w/s. I am currently using a Thunder Tiger Pro 46 with a 12x4 prop. Weight of the plane without the motor is 3lbs 8oz. I use this plane to do aerobatics and hovering.This motor is not quite pulling the plane out of a hover the way I would like. I have already removed the baffle from the muffler and it's still not the power I need. Can anyone recommend a name brand and/or size for a 2 stroke engine that could give it a bit more power to pull this plane out of hovers.

aussiesteve

[link]http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXNMD1&P=0[/link]

or - not a 2 stroke but will give significant reliable throttle response

[link]http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXBHES&P=7[/link]

ThumbSkull

My Feedback: (57)

55AX is very hard to beat for 3D on a 40 size profile (4-5lbs).
A Saito 72 or 82 is also great as is a YS63. All these are similar in power and overall weight.

The edge goes to the 55AX because you carry less fuel ans it can be made a full 2oz. lighter by putting a macs Scotsman muffler and also increase it's power.
Here is a poor video of my 5lb. profile but you can hear this setup.
http://www.youtube.com/watch?v=kyAJJ6970VI

fredscz

My Feedback: (47)

You might give an 11x5 prop a try. I have found an 11x5 to be better on my TT46's than a 12x4. I also have several OS55AX's in use and there is no comparison between them and the 46 size engines. I replaced a Saito 82 with the 55AX and the 55 is better on my 6 lb plane.

yankos

Hi guys

Also ys 70fzs would be a very good case

F4U Corsair

My Feedback: (22)

A cheaper option, $4., try an APC 13x4 sport prop (thin, not the thick one). I fly these on my .46FX/AX, and .47GMS. Not a speedster, but has gobs of pull/torque, and pulls good out of a hover with my profiles. If this doesn't work, I agree with the other suggestions, upsize the engine to a .55AX, or .82 Saito. DG

gene6029

Something you might want to try first. I run 30% heli fuel in my motors & it improves your rpms a bit. It will smoke alot due to the oil content. I'd try it first to see if it helps before buying another motor. You may be able to bum a few tanks of fuel off someone flying helis at your field before buying a jug of 30%....Gene

Pylonracr

Put an AX55 on it. You will pay a little for the engine, but if you take care of it it will last forever. Take the baffle out of the muffler to start, or if you can swing it buy a jett muffler or put a full length tuned pipe on it. The jett costs less, but the pipe will give you a little more power if you tune it correectly. The full length pipe wil also move the cg back a little if you need that.

ThumbSkull

My Feedback: (57)

You need smooth linear throttle response for 3D. Tuned pipes don't give you that.
They are great for getting maximum power but are not good for 3D.

daven

My Feedback: (1)

APC 11 1/2" x 4 give it a shot.

Kevins_RC

My Feedback: (1)

Couple of other ideas that I've used for years.
1. Run an extra long Mac Header and Long Tuned pipe. I tune the header long to put a little extra back pressure on the head. this pushes the torque curve down in the lower RPMs where you want them on a profile.
2. Buy some Zinger 12x4 wooden props. I balance the prop, then cut the tip like a Zinger Pro. I sweep the tip back further than a Zinger Pro. The wooden prop gives better throttle response since its light, and the modified tip allows it to rev higher. Experiment on how much sweep your engine needs.

I ran Webra Speed 50s for years. I ordered a couple of ASP 52s from HobbyKing and was amazed on how tired my Webras were. Sometimes you just have to retire the old :-)