perpetualrepair

Can anyone help?. have a US Engines 41 and know absolutely nothing about it. any and all help welcomed and encouraged,
Thanks in anticipation.

mrbigg

My Feedback: (21)

I just did a search and you can click this link and view the results. Looks like there's a few pages worth of threads. http://www.rcuniverse.com/forum/sear...reply=combined

khodges

My Feedback: (1)

What do you want to know in particular? It's essentially the same as a Quadra 42, has a Walbro carb, magneto igniton, a good basic gas engine. I've got one I've been flying for three years, never had the spark plug out of it. I run 40:1 Klotz and regular pump gas. Mine doesn't have a choke, or a spring starter, so forget hand flipping to start it. Takes about 20-30 seconds of electric starter to fire it up, I let it idle a couple of minutes to warm it up, and then run it at full throttle for 5-10 seconds to check response, and then take off. Has NEVER quit, and I can fly for twenty minutes or better on a 16 oz tank and still have fuel left when I land. I have a 20-6 Dynathrust prop on it and it will turn 7000 rpm, and idle at 1250.

The only problem I've ever had with it is the screws that hold the muffler vibrated loose and wallowed out the holes in the cylinder head. I had a friend helicoil the holes and mount studs, red loctited in place. No more problems.

Damn good engine, wish I had 3 or 4 more.

Flypaper 2

18-10 is the pretty well standard prop but as KHodges says, there are variations, depending on the plane.

eugene

I had a US41 in a TFGS Mustang... Not a powerhouse, but dependable as sunrise... A XOAR 20 X 8 prop, or a 19.5 X10 Menz gave me the best performance, in the 68 to 7000rpm range.. The Zinger and Top Flite props gave much noise, but little performance..
Just a solid, dependable old gasser, in the Quadra family..

perpetualrepair

is there a Walbro carb that has a choke that would fit this engine?. and is it possible to change the magneto to electronic ignition?.

Flypaper 2

The original Frontier chainsaws that were made in Trail BC and the origination of the Quadra motors, had a sliding plate that pivoted under one of the carb mounting screws. A spacer washer and a wave washer and a tin plate and you could make your own. Otherwise a small motor repair shop usually has them kicking around, at least I did. Just make sure the throat size is the same.

beepee

CH has the electronic ignition system for the US41. I have it on mine. Easy enough to install and set up. Performance is about the same with better idle and much lower weight.

Have fun!

Bedford