ORIGINAL: Joseph Fisher
Gald I started this tread It is fun. I was at Keesler in 1963-1964 and went to the Air Traning Comand contest at Lackland. I got theard place in rudder only with my Ambroid Charger OS pet .15 ,Controlair mule transmitter Controlair 4 reciver(I built from kits) . Stunt I Crashed my Nobler.
I found out I can get the Ethonal in Chanute and I will get the castor from Sig. I will try it with out the nitro. Aperentaly I can get the nitro mix with methonal 50/50. I will see what happens.
Well we were not far apart. I did not make the ATC in 63 or 64 but did the 65-66-67.
Here is that fuel formula that works with all my OLD engines, that I fly every so often. Fox 19, Fox 29, and Fox 35s - 36, and .40, included along with even some .049, 074, and .15. Regardless of the other opinions, a good friend now gone, but once was an engine man for a magazine, FM, I seem to recall told me this and he was RIGHT!
Small engines need lot of oil vice nitro. My Cox .049s fly sport very easy to start and needle with the formula below. I always had trouble with my 1/2 A speed and FF engines by using high nitro as it was said one must do. When I learned it was all about OIL, I never had anymore problems.
No problem getting the fuel basics and just some Castor needed as the only extra.
. (1/2 Gal.) of 10% nitro, 18% oil (Standard 80-20 syn-castor)
(qt) 5% Nitro 16% oil (Std 80-20 syn/castor)
Add 14 Oz. Castor Oil
110 Oz. fuel: 7.8% nitro, 27.8% oil at 56% Castor and 44% Syn.
It works fine for me.