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.15 racing engines - 4/4/2008 4:56:01 PM   
windcosmic


 

Posts: 46
Joined: 2/1/2008
From: Vicenza, ITALY
Status: offline 		Hy! I have found a quarter miget plan of 1970's . I started building the model, but I still have to find the proper engine to power it. Could anyone tell me what could be the best engine of the following : Uctkam .15FR pylon, MVVS .15 rear exhaust, OPS .15 side exhaust... maybe you could suggest me other engines? anyone has a new .15 speed or C/L combat engine to sell?

       Post #: 1

RE: .15 racing engines - 4/4/2008 6:25:15 PM   
Dan Vincent


 

Posts: 908
Joined: 7/13/2003
From: Sanford, FL, USA
Status: offline 		I guess you just want to build and fly a vintage Quarter Midget. There are no races so you don't have to beat anyone.

I'd go with the OPS.

(in reply to windcosmic)
       Post #: 2

RE: .15 racing engines - 4/4/2008 7:10:54 PM   
YUKONFLYR



Posts: 206
Joined: 4/18/2007
From: WHITEHORSE, YT, CANADA
Status: offline 		I have seen lots of .15 racing engines on the auction site ( epay). Rossi .15 is really prevelant

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(in reply to Dan Vincent)
       Post #: 3

RE: .15 racing engines - 4/4/2008 8:07:08 PM   
fizzwater2


 

Posts: 654
Joined: 8/16/2004
From: Paola, KS, USA
Status: offline 		when these were being raced several years ago, the Nelson rear exhaust .15 became the engine of choice. With no particular rules to follow, you could use a larger venturi (the quarter midget class was limited to .240 inches max ID) and even a full tuned pipe.

In Australia, they currently fly airplanes with the same size restrictions, and use .21 cu in engines with full tuned pipes, and they're quite a bit faster than the old AMA quarter midget planes. I've heard they use the Novarossi .21 with a full length pipe.

I think it would be fun to fly one built to the Australian rules!

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(in reply to YUKONFLYR)
       Post #: 4

RE: .15 racing engines - 4/4/2008 8:38:38 PM   
Dan Vincent


 

Posts: 908
Joined: 7/13/2003
From: Sanford, FL, USA
Status: offline 		"Yeah But!"

He wants to build an old QM ship from plans. Since there is no longer a QM class he doesn't have to worry about having the latest and greatest. He can use any engine ever made that is a .15 and will fit in the nose. He won't be competing with anyone so engine choice is not that critical.

I'd look at the plans and determine what period it was designed for and go with an engine from that era.

I don't know what the current Australian rules are for their .21 class but his ship may or may not fit the requirements.

What model are the plans for?

If it's an old "Bonzo" or something like that with non-tapered wings you could use an old OS Max-III or Fox.

Something more modern might call for a Cox Conquest, Rossi or Nelson. Before that would be a ST G.15, K&B .15S or maybe a Taipan .15 Goldhead.

What kind of engine is shown on the plans, side or rear exhaust?

< Message edited by Dan Vincent -- 4/4/2008 8:43:35 PM >

(in reply to fizzwater2)
       Post #: 5

RE: .15 racing engines - 4/5/2008 8:36:21 AM   
windcosmic


 

Posts: 46
Joined: 2/1/2008
From: Vicenza, ITALY
Status: offline 		the engine is a rear exhaust

(in reply to Dan Vincent)
       Post #: 6

RE: .15 racing engines - 4/5/2008 4:13:32 PM   
vertical grimmace


 

Posts: 1071
Joined: 3/13/2004
From: ft collins , CO, USA
Status: offline 		I think for just practical user friendly flying I would just throw a .25 FX with a jett muffler on it. A .15 may capture the nostalgia but a modern small sport engine would be more fun overall I believe.

(in reply to windcosmic)
       Post #: 7

RE: .15 racing engines - 4/5/2008 4:37:26 PM   
HighPlains


 

Posts: 2525
Joined: 3/2/2003
From: Over da rainbow, KS, USA
Status: offline
quote:

I would just throw a .25 FX with a jett muffler

Why stop there? Lots of great engines in .25 size cases like the OS .32 which turns great on a light prop or TT.36 or Irvine .39 all of which are very light engines.

Many years ago, the Mexicans were racing QM airframes with pylon racing .40's at the high altitudes of Mexico City.

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(in reply to vertical grimmace)
       Post #: 8

RE: .15 racing engines - 4/6/2008 12:38:18 AM   
daven



Posts: 6617
Joined: 12/7/2001
From: Andover, MN, USA
Status: offline 		When I get to finishing mine up, it will have a Jett .35 in the nose.

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(in reply to HighPlains)
       Post #: 9

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