I have the Powermaster 15%nitro and 18% castor/synth fuel is it wise to add 4oz of Longs Drugs 100% U.S.P. Castor oil (Laxative) to the gallon to get the oil content up to 20% or is that fuel okey at 18% for Break-in.
Also I have a Two Blade 14x6 prop and a 12x8 three blade prop which is better for breaking the TT91 in. Or should I buy a 13x6 for break in.