Quote from: C.T. Schaefer on September 15, 2024, 03:57:18 AM
I have been flying a Shark 15 with .15x for several years and flew it GMA 10/22.

Just to clarify, does 10/22 stand for "10% Nitro/22% all castor" or "10% Nitro/ 11% castor and 11% synthetic oil"?

What does GMA stand for and is that fuel still available?

In another Fox .15x thread someone mentioned Powermaster 10/22.  Is Powermaster still available?

Thanks,
Joe Ed Pederson

GMA was George M Aldrich.  He is gone now.  Ritch's Brew is the current leader in glow fuel.  He has anything anybody needs or wants.

There is a point in getting all fuel sensitive with a new high quality engine. 
But an old sport engine has, most likely, been abused in the past and maybe worn out.

Quote from: Paul Smith on September 16, 2024, 10:58:12 AM
GMA was George M Aldrich.  He is gone now.  Ritch's Brew is the current leader in glow fuel.  He has anything anybody needs or wants.

There is a point in getting all fuel sensitive with a new high quality engine. 
But an old sport engine has, most likely, been abused in the past and maybe worn out.

   Per the other thread, one thing that stood out in my limited ground testing was that if you are running the 15x with the "spacer", and try to run it on typical stunt fuel, you are going to have a bad experience trying to start it. Fox recommended Missile Mist, which as I recall was 25% nitro, that's what it wants with the extremely low compression.

    Brett

Quote from: Paul Smith on September 16, 2024, 10:58:12 AM
GMA was George M Aldrich.  He is gone now.  Ritch's Brew is the current leader in glow fuel.  He has anything anybody needs or wants.

There is a point in getting all fuel sensitive with a new high quality engine. 
But an old sport engine has, most likely, been abused in the past and maybe worn out.

I tried to order fuel from Ritch's Brew like a year ago. I actually talked with him and emailed him wanting to order fuel. Then he just totally stopped corresponding with no explanation. So, I finally gave up. I guess he did not want my $$.

I have been able to source my fuel from others.

Quote from: Joe Ed Pederson on September 16, 2024, 10:05:32 AM
Just to clarify, does 10/22 stand for "10% Nitro/22% all castor" or "10% Nitro/ 11% castor and 11% synthetic oil"?

What does GMA stand for and is that fuel still available?

In another Fox .15x thread someone mentioned Powermaster 10/22.  Is Powermaster still available?

Thanks,
Joe Ed Pederson

    Powermaster GMA is still available, it is 22% oil with 50/50 castor/synthetic. As noted, I would not use 10% nitro for a Fox 15x. It worked OK when I tried it with a 15xx (no spacer).


      Brett

Brett,

Thanks for the clarification, Brett.

I have some Red Max 15/22 (11% syn/11%castor).  I'll give that a try.

I've had the same experience with Ritch's Brew (no response).  I hear that brings fuel to some contests.

Who distributes Power Master fuel these days?


Joe Ed

Quote from: Joe Ed Pederson on September 16, 2024, 05:52:16 PM
Brett,



Who distributes Power Master fuel these days?


Joe Ed

Never mind.  I found the VP Racing Powermaster website.
 
Boy, do they think highly of themselves.  $17 a quart and $53 a gallon.  Perhaps I'm just behind the inflation curve, but if that's what everyone is charging for nitro fuel, I guess I'll have to retire my IC motors and go electric when my remaining fuel is gone.

The last time I was in Schaeffer' Hobby shop a gallon of Omega 10% nitro was under $30 dollars.  I can always add more oil to the Omega if it is still available at that price.

Red Max was very accommodating to five different mixes in small quantities and were quite prompt.    But they no longer make/sell nitro fuel.

Joe Ed

Don't buy your fuel from VP, you'll pay through the nose. Give Stan a call at S&W fuels 610-252-2024.

MM

Quote from: Motorman on September 16, 2024, 09:08:16 PM
Don't buy your fuel from VP, you'll pay through the nose. Give Stan a call at S&W fuels 610-252-2024.

MM

Thanks for the tip.

Joe Ed

Been through this thread a couple of times and haven't noticed what version of the Fox .15 the OP is asking about. The earlier "steel fin" is ok with an 8-4 (I used a Tornado nylon), but the slant plug .15X likes smaller props and higher revs.

If you look at the APC line, they have some fractional diameters (like 7.5") and a variety of pitches. It's highly unlikely that your LHS will stock them, but the APC factory is extremely fast and they give excellent service. I got my order in 3 days, but it's a pretty straight shot up I-5.  Steve

Steve

It be the simple steel fin version. Yes, APC is top notch service with an outstanding line up. I might lean on them should the MAS change its mind about being a good prop. Thanks for the follow-up.

Dave Mo...

Resurrecting this thread. Motorman suggested naphtha for cold weather starts in "At the Handle" above.

Motorman: Assuming fuel is brought up to the needle from the tank, are you shooting this go juice into the venturi followed by a few flips, or does it go directly into an open exhaust port?

I'm vulnerable to cabin fever during Winter here and need to get out for flying. Your advice is appreciated.

Dave Mo...

Quote from: Dave Moritz on October 20, 2024, 08:05:45 PM
Resurrecting this thread. Motorman suggested naphtha for cold weather starts in "At the Handle" above.

Motorman: Assuming fuel is brought up to the needle from the tank, are you shooting this go juice into the venturi followed by a few flips, or does it go directly into an open exhaust port?

I'm vulnerable to cabin fever during Winter here and need to get out for flying. Your advice is appreciated.

Dave Mo...

  Squirt it anywhere the fuel goes!!! If you have a muffler in place, you have to put it in the venturi. Just a squirt, about as much as you would a prime of normal fuel. In cold weather, make sure you have a hot plug and a good, hot battery for the best glow possible. I have heard of some guys squirting some on the head and cylinder, then lighting it off carefully to heat up the cylinder, or even using a small propane torch if i t's a profile with easy access to the cylinder. For me, it had just better be at least 50 degrees before I'll subject myself to that kind of abuse any more!! Those days are behind me now!!
   Type at you later,
    Dan McEntee

Gotcha, Dan. Don't blame you a bit in avoiding the freeze. I never thought of a small torch to heat the cylinder. Might be good to have a handful of snow available in case things get out of hand.

Thanks.

Dave Mo...

              Dave , if you do use lighter fluid for cold starts make certain you have hand protection on. It makes the engine really kick back at you. Backflipping is a better way to start your engine using the lighter fluid.

Also, keep the lighter fluid off your silicon tubing.

This is one of my favorite engines, Larry Scarinzi liked them, I always replace the needle valves with ST clones and it makes them worlds better, Hobby King Turnigy 8x4 is what I use . They like 10/22 GMA fuel, I add a touch of extra castor to it, I have used Glo Devil and Fire Ball shorts mediums or hots, going to try milling out a tongue muffler for it when I get my shop set back up after the move. TJ

I have been running a 15x on a Sig Buster for a dozen years or so it was my first plane after not flying for 35 years, I put an RSM needle valve in with the throat narrowed like you do for Fox.35. I used Master Airscrew 8x4's since thats what it came with off of EBAY and also had good luck with the Turnigy props from Hobby King I run the Omega 10-22 CL fuel with a little caster added, a little more if its hot out. Ive been running the same Sonic Tronics short plug in it that I bought at the last Wram's show in White Plains NY. I love the little 15x's get rid of the fox needle valve and they are so much better to use. TJ

What's funny is I've got a Fox 15x on a Yak9. Anyway, you could use an APC 7-5 sport prop on your Sig Buster if you want more speed.