View Full Version : mini mouse motor?

11-16-2004, 11:02 PM
In the current copy of Fly RC (January 2005)is an article on a scratch build 1/8 scale working Rolls Royce Merlin !

Built by Dick Yeagley over a 10 year period with information provided by the Smithsonian Air and Space Museum, the EAA and the Stallion 51 Group

made out of all aircraft material, no castings

It burns 100-octane low lead aviation gasoline ,lubricated by a 50/50 mix of 5x30 castrol motor oil and Shaler Rislone and cooled by diluted ethylene glycol

Its been ran at approximately 5,000 rpm with a 17in 4 bladed prop

11-17-2004, 12:19 AM
1/8 scale? If this is the x,y,z dimensional scale factor the displacement works out to ~3 ci !!! If the ci were scaled 1:8, we would have 200 ci and an engine about 1/3 x,y,z scale.

If this is a working, SOHC, 4-valve, etc. etc. Merlin at 3 ci it is an absolutely incredible achievement. That's a whopping 4 cc per cylinder. A decade? Sounds like a life's work!

11-17-2004, 09:44 AM
overall length11.5in, cylinder bore is.688 and the stroke is .766 inches for a total displacement of 3.4 ci

The distributors have 69 individual pieces and the caps have 40
the larges machine screw is 0.034 in diameter

11-17-2004, 10:15 AM
Not the same engine BlackSheep is talking about but just as impressive I'm sure ---> http://archive.dstc.edu.au/BDU/staff/ron/gallery/croft/eagle/

I have some video of one of these small Merlins running, sure wish I could remember where I got it from...

11-17-2004, 01:06 PM
I thought the minature Offys and V-8's I've seen were cool until I saw these , OUTSTANDING !!

11-18-2004, 08:41 AM
I knew if I looked hard enough I'd find IT! (www.enginehistory.org/model_engines.htm) Click the link, then check out the video :eek5:

11-18-2004, 11:45 AM
I knew if I looked hard enough I'd find IT! (www.enginehistory.org/model_engines.htm) Click the link, then check out the video :eek5:Wow... sure would like to hear it with straight stacks! Or, maybe hear a real Merlin with the combined maifolds/headers

Simply amazing what someone can do with their spare time, given talent and tools!