Need some help here. I have a new Saito .56 to go with my 4*40. Some issues are that the throttle arm lines up with the mount and is above the cowl and the engine looks too high. Any thoughts? Here are some pics.

Also, if I mounted the engine inverted, the throttle arm would still hit the mount.

Thanks!

Another...

Elwood,

I think that the Saito .56 is the engine that they have drawn on the plans isn't it?

It's the .50 in the plans. I wonder how they did it. If I reverse the carb and then lower the throttle arm it should look OK, I guess.

saw one of these planes at my flying field last week with this same engine. That guy had used a Du-Bro 4-stroke throttle linkage to hook up his servo/throttle. The linkage itself was attached to the engine mount. This arrangement is somewhat difficult to initially set-up, but once done, seems to work great. Take a look at the website for this item:

http://www.dubro.com/Cat_2002/Cat_44.html

The Saito .56 is the same size as their .45 and .50s and will fit just fine. The Dubro linkage is great or you can whip one up yourself from a 1/2A U-control (remember those?) bell-crank. You can also reverse the throttle arm to the bottom if there is enough room in your mount, and failing all that, you can make a trombone bend in the linkage wire to double back and connect from the front to give an offset. Any way you do it will be just fine. Don't forget to explore mounting your Saito sideways to put the exhaust out the bottom and let you fuel up without having to pull the pressure line from the muffler.

quint

You don't need a bellcrank. Just use a servo arm with a screw through it into the engine mount. Use a little thread lock to keep it there. A pushrod from there to the throttle takes care of things??

"Don't forget to explore mounting your Saito sideways to put the exhaust out the bottom and let you fuel up without having to pull the pressure line from the muffler."

Hey Quint, would you explain what you meant by that? I honestly do not understand. I am installing a 4-stroker in my 4*40 also, and want to know what all the advantages are to a sideways mount. Exhaust out the bottom I get, but what about that other statement?

Thank You, Craig - N7OR
Sandy, Oregon

When you have the exhaust/muffler below the engine, fuel overflow when filling the tank will run out the muffler without the posibility of flowing back into the cylinder and causing a hydrostatic lock. With the engine in the upright position and the exhaust straight back or (as most mount it) at an angle up, the fuel can flow back into the cylinder and most folks will pull off the pressure line each time they fuel up to let the fuel overflow safely.

quint

It is also easier to get the tank at the correct level with the engine side mounted. Many planes with upright engines have the tank too low, trainers, especially.

If you do side mount, reverse the carb so the needle valve is up rather than underneath.

I see. Thanks.