ETLB Squawk Forums — Archive

I saw this video with a 220CC V4 4 stroke engine for an rc plane.. but the builder says it has 25hp shaft output!  Imagine if it was a little bigger!  We could use it on our planes! And listen to that sound.  The whole plane's takeoff weight is about how much our engines weigh.  A v6 or bigger v4 of this engine.. would be incredible.

https://www.youtube.com/watch?v=-xpi67OTBFo

according to the youtube thing, it's only 220CC. I agree, if the engine has 25HP with 220CC, then about 500 CC might be 50. I just wonder what that configuration would weigh?
Sounds like a Nascar going down the track!

Check out the landing gear too? interesting spring setup in the middle to help the aluminum spring gear.

Notice the wind in the Video! WOW

If that engine and entire plane weighs less then my engine and has 25hp, I say make a v8!  Imagine that sound!

Also yeah, I agree, that landing gear is very interesting. Whoever this german person is, they are very talented.

TBO would be measured in minutes, unfortunately,

As long as the number of minutes is in the high five digits, we should be fine  

In all reality, I was trying to figure out how they get so much horsepower from such a tiny engine, but in reality, it's not.. that crazy?  25hp from 220ccs is 113.6hp per liter.  That's at the high end, but there are many production sports cars that are naturally aspirated that meet and exceed that number, well into the 130's of hp/liter.  So..  It's not that crazy?  It's not like some kind of drag engine that has a life time measured in thousands of revolutions of the crank.  A lot of those sports cars are naturally aspirated Porsche 911s and Audis.. which I know can have very decent engine lifetimes.

In all likelihood, it probably just runs a very high compression ratio and has really good airflow in the inner workings.

Or motorbike engines. My Honda VFR put out 100h.p from 750cc. And it did it reliably for 60,000 miles. But it did need to rev to 12,000 to make the h.p. You'd need a hell of a reduction gear!

Bruce

Imagine the glorious sound an ultralight at 12k rpm would make!