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Engine basics => Engine set up tips => Topic started by: Christopher Root on February 01, 2018, 03:52:20 PM
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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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P.S. Flying line length suggestions would be appreciated as well!
C R
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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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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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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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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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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
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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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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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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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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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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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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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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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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