I never seen a carb set-up like that. I supose the fuel/air mix gets to rotary valve through some kind of passage you cut in adapter. I would apply about 1 pound or less of air pressure to pressure fitting on exhaust. Make sure exhaust outlet is plugged so you can pressure crankcase. Now take some bubble water and spray and check for any leaks around front of engine. You will have to hold your finger over carb intake. If you find leaks where they should not be...it will not tune right. Hope this Helps. capt,n

What glow fuel are you using?

I am using power master 100% castor.

1, The adapter for the ST has a channel cut into it. The channel goes to the stock intake (center in front of the cylinder). JB Weld holds it together. The adapter is actually two pieces interference fit and JBW. The first intake allowed fuel to collect in a cavity that has been filled by the "second Piece". It took several seconds for the engine to respond because of the fuel collected in the cavity. As I mentioned before this engine runs like the Stock version.

Gas problems! I do not know what oil is in my Traxxas Top Fuel and my gas may be older than I realize.

Sir Winston said something like " Onward and upward into the bright sunlit uplands"

Traxxas is what i run. It is the only fuel I can find out here that is 10/10. I have never had my fuel mix do that. I think there has to be water in that gas.

Paul

Very interesting Profgigawatt. Keep them coming [sm=thumbup.gif]

Got new gas, name brand. Same result. I mixed Redline oil into the mix after it seperated to see if something would mix.

.40 size plane (Twist) on gas. 21 cc Featherlite, C&H ignition, throttle coupled spark advance. 50:1 gas:synthetic. Hovers at 1/2 throttle. Flies 12 minutes on 4 ounces of fuel. 3 seasons and ready to go again. CHEAP fun. Joe

Cool Joe! On my next 40/25 I'm going to do another sport plane that I can shorten the nose. On my Kaos I put the servos for the tail in the tail and the battery under a hatch half way back to the tail. That torque is really something! I am getting that 16/8 to about 7700 rpm. I found a site out of the UK that has a highly modified WE spinning that prop well over 8K. This guy tried the Gas-Glow and CDI, he's gone back to the CDI. Thanks for the pics. Prof G

i'll remember that post when someone states that you cant fly a gas engine on anything less than a 120 size plane ha ha. man a 40 size plane with a gasser that is awesome.

I am used to the "You can't do that! That phrase sets me in motion. The 3 blade props make a scale warbird quite viable in the 40+ size. A short coupled (radial engined) fighter usually benefits from some sort of ballast. I was pleased to find that my Kaos had a 26oz wing loading with the 25 and the 5oz ignition/battery. I use a 10oz tank and have never run out of fuel. The 40 size gas was the inspiration for converting engines. My 25 with the ST carb is about 32oz. Sounds like a neat "Class flyer" Prof G

i have a 21cc featherlite at home i am going to experiment to see what i can do to get it on a 60 size yak in the next year or so.

That round plane should do well. If I could spell Sukoi?, I would tell you that the GP ARF looks good to me for a WE. ARF's are what you do after a B-17 cures your appetite for building! Prof G

I won the Yak at a swap meet at the beginning of the month otherwise i would rather build. its a seagull models 60 size yak pretty little plane. i am impressed.

Who sells the Twist .40? With a gas engine on it...they must be built good! Thanks Capt,n P. S. Thanks Carl for that quick reply for where this Twist Thread is.

Is the Twist .40 about like a Goldberg Hot Stisk? http://www.carlgoldbergproducts.com/.../gbga1091.html Thanks Capt,n

The Twist is made by Hangar 9 and available through Horizon Hobby.

Actually, there are 3 of them. I have the Twist 40 with a Fox .78 engine on it. (A rocket!) I also have the Twist 60 with a Super Tiger .90 on Gas/Glow on it. Then they also make the Twist 150 which is designed for Glow or a 26cc gas engine.

The Twist shown in this thread is the .40 version. They are fun planes, but have a weakness in the fuselage. There have been problems with them breaking the fuselage at the rear edge of the canopy where the fuselage is the thinnest. I never broke my Twist 40, (knock on wood!) but I broke my Twist 60 fuselage twice. I finally laminated 1/8" ply with epoxy onto both sides of the fuselage in that area, and no more problems.

Here's a pic of my Twist 60/Super Tiger Gas/Glow .90 combo. (Taken after fuselage repair)

AV8TOR

Hi ya Guys, It's Hangar 9's .40 size Twist 3D. Box stock except for the engine. No beefing up anywhere. Ignition and ignition battery in the fuel tank compartment. Fuel tank in the receiver compartment. Receiver and receiver battery under the casnopy. No lead anywhere and it balanced. The thick airfoil makes it handle the little added weight. Radar gun sez 81 mph flat out. With throttle management it can descend to land VERY slowly. Near vertical descent, with slight forward motion. I took off the stock design trim. Looked to toylike. Black sunburst on top with yellow checks on the bottom. Very rugged, has held up well for 3 seasons and ready to roll next season.

Pics of Twist. Didn't load 1st time.

BTW, my Twist 60 was the easiest ARF I have ever put together bar none. It can literally be thrown together in a few hours. The tail bolts on, and the controls are all hinged ready to fly, etc. Super neat ARF.

AV8TOR

Too Cool!!! I would think that a plane that is plank sided to the fire wall would be good without any more than insuring the joints are good. The only caution would be to rig the tail. My Kaos tail shakes pretty much at idle. I watch the tail mounted elevator servo very close and it has 4-40 linkages. I also try to use silicone between the wing and fuse using waxed paper etc. to get a solid wing/fuse interface to make the plane a rigid unit. I have an APC 4 blade I want to try. That should work for ground clearance and load the engine enough. Prof G.

If you look at the rear of the wing mount area, you can see that the distance between the canopy rail and the wing cutout is quite short. This is where they break if they are going to as it is the weak point. The structure from that area back is very lightweight.

Both times mine broke, I was flying in very gusty winds. Both times I landed successfully, and afterwards a gust of wind picked the airplane back up. When it fell down, it broke right in that weak spot both times. There is a really long Twist thread here in the forums, and others have mentioned the same problems. I don't think my fix of adding 1/8" ply doublers in that area added much weight, but it's much stronger.

AV8TOR

I have modified one of the newer 25cc Poulan engines, a California, 2005 engine. The engine has an opened up Zama carb and some internal changes. The ignition is a TIM with 60 degrees of dwell and a 1/4-32 spark plug. This engine has turned an APC 16/8 at 8400 rpm on gas only. The weight is 40 oz including battery and muffler. I was wondering how those numbers compare to what other builders of the Poulan 25cc have gotten.