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Author Topic: Proper Fuel for Engines  (Read 2279 times)

Offline Christopher Root

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Proper Fuel for Engines
« on: February 01, 2018, 03:52:20 PM »
Hello All!

Getting ready for spring (albeit early!)  Need to know the proper fuel for the following:

Gilbert Thunderhead .074
Gilbert Thunderhead .11
Fox .15
McCoy .19, 29. 35
Enya .29
Fox .35
OS-FP 25


I'm inclined to use 10% nitro 29% oil on all the Fox's, McCoy's, and Enya's, but open to suggestions.  The Gilberts and the OS I really do not know. 

Thank you!

C R

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Offline Christopher Root

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Re: Proper Fuel for Engines
« Reply #1 on: February 01, 2018, 04:06:15 PM »
P.S. Flying line length suggestions would be appreciated as well!

C R
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Offline Skip Chernoff

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Re: Proper Fuel for Engines
« Reply #2 on: February 01, 2018, 04:37:01 PM »
CR  all of the engines except the Gilbert ones can run on 10/29. The Gilbert engines would benefit from higher nitro. I'm thinking 20 to 25% nitro.

As far a line length goes that's a horse of a different color. I'd say on the 15 and 19 like 50' lines, all others 55 to 60'. The Gilbert stuff around 45' .Best of luck
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Offline pat king

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Re: Proper Fuel for Engines
« Reply #3 on: February 01, 2018, 05:26:32 PM »
29% oil is too much for an Enya 29. For 10% Nitro use 20% oil. When I go to 25% or higher Nitro I go to 25% Castor.

Pat
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Pat King
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Offline Christopher Root

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Re: Proper Fuel for Engines
« Reply #4 on: February 01, 2018, 05:34:25 PM »
Thank you! But why would 29% oil be too much for the Enya ?  I believe it is a 5224, or iron-piston lapped setup with bronze bushing . . .


C R
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Offline Skip Chernoff

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Re: Proper Fuel for Engines
« Reply #5 on: February 01, 2018, 06:47:05 PM »
I'd like to know why 29% is too much for the Enya as well. I used 29% pure castor in my Enya 35 for years and she ran great! Still does....
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Offline RandySmith

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Re: Proper Fuel for Engines
« Reply #6 on: February 01, 2018, 07:38:10 PM »
Quote from: Christopher Root on February 01, 2018, 03:52:20 PM
Hello All!

Getting ready for spring (albeit early!)  Need to know the proper fuel for the following:

Gilbert Thunderhead .074   .....  15% NITRO 25% OIL
Gilbert Thunderhead .11   .....          15% NITRO  25% OIL
Fox .15           ......    10% NITRO   25% OIL 1/4 SYNTHETIC
McCoy .19, 29. 35 .........   5-15% NITRO    28% OIL 1/4 SYBTHETIC
Enya .29  .......  5- 15% NITRO  23% OIL 1/2 CASTOR
Fox .35   ........   5-15% BITRO    28% OIL AT LEAST 1/4 SYNTHETIC
OS-FP 25 ............. 22% OIL 1/2 SYNTHETIC    WHATEVER NITRO IS NEEDED  (5-20%)



C R
« Last Edit: February 01, 2018, 10:03:20 PM by RandySmith »
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Online Brett Buck

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Re: Proper Fuel for Engines
« Reply #7 on: February 01, 2018, 08:14:59 PM »
Quote from: Skip Chernoff on February 01, 2018, 04:37:01 PM
CR  all of the engines except the Gilbert ones can run on 10/29. The Gilbert engines would benefit from higher nitro. I'm thinking 20 to 25% nitro.

   I am sure it would run better on that. I am less confident that it will survive for long with 25% nitro, unfortunately.

     Brett
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Online Brett Buck

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Re: Proper Fuel for Engines
« Reply #8 on: February 01, 2018, 08:19:29 PM »
Quote from: Christopher Root on February 01, 2018, 03:52:20 PM
The Gilberts and the OS I really do not know.

   29% straight castor is WAY too much oil for the 25LA. It won't permanently damage anything, but it will greatly reduce the power and cause a rapid buildup of varnish, which you would want to remove to restore the performance.

    This engine will get by with 18% castor/synthetic blend, up to about 22% blend. Don't use all-castor and keep it in that range - which, not coincidentally, is about what you can normally get at local hobby shops. More nitro would be OK, but above 20% it won't help very much.

     Brett
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Offline pat king

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Re: Proper Fuel for Engines
« Reply #9 on: February 01, 2018, 09:58:28 PM »
Enya literature states 20% Castor. The Enya engines have excellent metallurgy. 29% lube will only slow them down, gum them up and get more slime all over your airplane. I have about 30 Model 5224 engines. I have never run more than 25% Castor oil lube and only when the Nitro is 25% or more. My 1966 29 IV and 35 III have a lot of hours on them. The 29  has been run in a Rat Racer with the 9 to 1 head, #3 Venturi, timed crankcase pressure, and a 7-11 Rev-Up wood prop. The fuel was 25% Nitro and 25% Castor. Even with lean runs that stopped the engine in flight there was never any engine damage. The engine still starts and runs well. The old Fox engines have so-so metalurgy, and small diameter crankshafts, that results in high main bearing loads. The high loads are better supported with the 29% oil. 29% oil in glow fuel is a hell of a lot of oil.

Pat
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Offline Christopher Root

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Re: Proper Fuel for Engines
« Reply #10 on: February 02, 2018, 08:10:33 AM »
So in the interest of simplicity, is there one fuel that I can use for all of my McCoy and Fox engines?  Say 5% Nitro 29% castor, or 5% Nitro 11.5%castor/11.5%synthetic?

C R
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Online Brett Buck

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Re: Proper Fuel for Engines
« Reply #11 on: February 02, 2018, 10:12:32 AM »
Quote from: Christopher Root on February 02, 2018, 08:10:33 AM
So in the interest of simplicity, is there one fuel that I can use for all of my McCoy and Fox engines?  Say 5% Nitro 29% castor, or 5% Nitro 11.5%castor/11.5%synthetic?

   I would suggest 10% rather than 5, all the engines will run much better and needle better, and it's not enough extra to break anything. I would use 29%, probably straight castor.

     Brett
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Offline RandySmith

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Re: Proper Fuel for Engines
« Reply #12 on: February 02, 2018, 09:37:38 PM »
Quote from: Christopher Root on February 02, 2018, 08:10:33 AM
So in the interest of simplicity, is there one fuel that I can use for all of my McCoy and Fox engines?  Say 5% Nitro 29% castor, or 5% Nitro 11.5%castor/11.5%synthetic?

C R

Yes  as I wrote to you ,  you can use  5 to 10% nitro  with 28%  oil, and  DO NOT  use all castor, make sure some of it is synthetic  1/4  will be  good

Randy
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Offline Christopher Root

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Re: Proper Fuel for Engines
« Reply #13 on: February 24, 2018, 11:48:57 AM »
 Thank you!  Going the 1/4 synthetic route: do I buy it pre-mixed from Brodak, or do I buy fuel with X% castor oil and add in 1/4 more synthetic oil?

C R
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Offline RandySmith

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Re: Proper Fuel for Engines
« Reply #14 on: February 24, 2018, 12:10:27 PM »
Quote from: Christopher Root on February 24, 2018, 11:48:57 AM
Thank you!  Going the 1/4 synthetic route: do I buy it pre-mixed from Brodak, or do I buy fuel with X% castor oil and add in 1/4 more synthetic oil?

C R

IF you can buy it  pre mixed  do that

Randy
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