Tach Race Fuel and Prop Update

Kim Tue Nov 29, 2011 11:57 am

Mark, Chris, and I have been looking at some changes in the fuel and prop type used in the upcoming Tach Race. Looks like we're leaning toward 24 or 25 % Nitro, and going with a Cox Grey 5-3 for a prop. The consideration for the fuel change was to put the engine run in the realm of what is typically run by modelers, as with the use of the Cox propeller.

I'm good with it, and figure the switch away from the APC prop might help avoid my having a personalized coffee cup at the local emergency room.

As always your comments are welcome.

microflitedude Tue Nov 29, 2011 12:50 pm

Kim wrote:I'm good with it, and figure the switch away from the APC prop might help avoid my having a personalized coffee cup at the local emergency room.

Yep, those APC's are sharp!

Seriously though, you may want to look into some finger protection flipping all those engines.

Paulgibeault Tue Nov 29, 2011 1:08 pm

Hi Kim:

Yes, your suggested prop & fuel change sounds just fine by me. Good Luck!

Cheers, Paul

nitroairplane Tue Nov 29, 2011 1:43 pm

I think it was Andrew that told me APC was an acronym for :awfully painful cut Smile

Mark Boesen Tue Nov 29, 2011 2:16 pm

Hi Paul!

Good to see you on the forum, your knowledge is invaluable!

I forwarded your Mouse Engine set up to Bernie, now thanks to Warren its got your photos added.

Mark

**RknRusty** Tue Nov 29, 2011 2:39 pm

I was tinkering with a good running freshly rebuilt Black Widow in the shop this morning. I made 4 runs comparing Sig 25 to Glowplugboy 24. In two runs on each, the Glowplugboy ran smoother and was easier to needle, plus ran an extra 30 seconds. Un-scientific, but notable to me. So if that trend continues, I'll use Sig for the fast rotaries and Glowplugboy for the reedies. I recently tried Sig because I thought the lubrication would be a safer choice for the TD and Medallion.
I'll try to duplicate the results. If anyone is interested in trying, I'd like to see if it's a fluke or generally valid.

Kim Tue Nov 29, 2011 3:20 pm

RknRusty wrote:I was tinkering with a good running freshly rebuilt Black Widow in the shop this morning. I made 4 runs comparing Sig 25 to Glowplugboy 24. In two runs on each, the Glowplugboy ran smoother and was easier to needle, plus ran an extra 30 seconds. Un-scientific, but notable to me. So if that trend continues, I'll use Sig for the fast rotaries and Glowplugboy for the reedies. I recently tried Sig because I thought the lubrication would be a safer choice for the TD and Medallion.
I'll try to duplicate the results. If anyone is interested in trying, I'd like to see if it's a fluke or generally valid.

Good note Rusty!! I got both...may have to give it a try.

Paulgibeault Tue Nov 29, 2011 4:20 pm

Thanks Mark for your assistance in doing that. Also thanks to Warren for help with the photo's.

A combined effort is often better than a solo effort especially when the solo guy isn't
all that computer literate!!
Unlike some, I certainly believe in the sharing of information amonst my fellow modellers.

Cheers, Paul

P.S. I ran my first reed crankcase pressure fuel system today. No big numbers, but it starts & runs fine...

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