RCU Forums - View Single Post - Why we don't see pattern planes for gas?
Old 10-04-2009 | 12:23 AM
  #28  
MTK
Senior Member
 
Joined: May 2004
Posts: 5,386
Likes: 0
Received 1 Like on 1 Post
From: Whippany, NJ
Default RE: Why we don't see pattern planes for gas?


ORIGINAL: AAbdu

I would love to see a 35% or 40% pattern plane. I know that it wouldn't be legal for pattern or IMAC, but how cool would it be to see like a 126 inch x 126 inch 150CC Integral! I know it will never happen and it is probably a little off topic but I think that would be great
No real reason this couldn't be done. A DA150 puts out a terrific amount of power on canister mufflers. A well thought out design would weigh considerably less than the typical 40% IMAC plane.

Props are not really available for pattern type performance though. You'd have to carve you own which isn't a big deal actually. Something with around 18" of pitch should work very nicely at the lower rpm of the 150. But it would need to be crafted properly to do any good

BTW, a few months ago I watched a video of an electrified 40% IMAC plane which was using a conventional wood prop of appropriate size to drive the crate. It sounded about as noisy as the gas powered counterpart...that's how bad some large props are. That much noise requires a lot of power to generate

Another BTW, Ed Alt, Frank Imbriaco and I have been discussing the Syssa 30 cc gas engine. We will try to get to their shop in the next few weeks and bring a few pattern props with us. We will also bring the ES 40G pipe along and play a bit. We'll report in the KFactor probably. Having had considerable experience running Moki 30cc on glow, (and OS and Webra) it will be interesting to see how the engines compare.

I have a project going right now and have planned to use the ZDZ40RE F3A engine in it. If the Syssa 30 cc works well, I may reconsider the powerplant. The weight savings is substantial. The ZDZ has superb manners however....the Syssa has alot to live up to

MattK