I was wondering if this engine would be a good selection for this plane that i am currently building in an aerospace class in school.
this is the cub: http://www2.towerhobbies.com/cgi-bin...?&I=LXN774&P=7
and this is one of the engines i am considering: http://www2.towerhobbies.com/cgi-bin...?&I=LXUJ71&P=7
or: http://www2.towerhobbies.com/cgi-bin...?&I=LXLW81&P=7
I Like the OS engine because of their great reputation, i have one in my rc car and it has never failed me. the kit calls for a .049-.061 size engine, but i wanted the extra power because i thought it would be less likely to stall. and i wanted to be able to use a throttle, instead of the .049 engines my teacher supplies that have no throttle control.
so if not these engines i would appreciate if someone could tell me another that would better suit my needs.
i was also wondering if the os could run on the 20% fuel i have left over from my car.
Thanks,
James

Commander, I would not like to rain on your parade. But the OS is just too much. It is too big and heavy to be carried by that airframe. You would probably not be able to balance it. The other engine in your list would likely do well. Another good choice would be a Norvell engine. I believe they would also work for you. The 20% is a good idea. Little engines really do need nitro to run well. Be sure to use the appropriate radio gear as well. I am not real familiar with the small gear. Any help there will have to come from somewhere else. And lastly be sure to build light. Small planes are very intolerant of weight. Be careful with it. The kit you chose is from a manufactuer that has a good rep. Just follow thier directions and reccomendations and you should have a fine flying model.

Mark Shuman

i would go with the .09 but i wouldn't use the car fuel as it doesn't normally have enough oil in it.

James,
First, welcome to RCU. It's a great place and you should get a lot of terrific info.

I agree that the OS would be a bit much for that plane, and would also agree with a Norvel. They make an 0.061 with throttle control.

Here's their catalog page for engines in your size range: http://www.shopatron.com/index/100.0.1979.1981.0.0.0

Keep in mind that the Herr Cub is relatively small, so you'll want to keep it as light as possible. Adding throttle will add weight, but if you're careful, and use something like the GWS Pico servos, receiver, and maybe Lithium Polymer Battery pack for the on board stuff, it should be a nice, light, good flying airframe.

Good luck with your project,
Dennis-

Hey guys thanks for all the great information. im concerned about this plane being overweight. we have micro servos and stuff but the battery we will be using is probobly a bit too heavy, it is designed to be used in an rc car. the last plane we built was another cub from herr, but with only a 35 inch wingspan, it was electric powered and we were very disappointed when the provided electronics made the plane too heavy to get off the ground. so i dont really know what to do, the teacher probobly will not invest in lighter stuff, so i was hoping to solve the problem by adding more power, but i dont really know anymore. any input would be great. thanks.
-James

With glow power you only need a 4 cell battery pack to power the receiver and servos. An RC car pack is 6 cells and won't be useable. (Too much voltage.)

You or your teacher can buy a standard receiver pack at the hobby shop for about $15.00.

Has your teacher flown RC planes before, or is there someone to fly the plane when it's ready?
Dennis-