I have been running Omega 10% pink that is the Castor Synthetic mix in my engine an OS VF40 . I know what you all are going to say , Don't run that in your plane n1but I live 140 miles from the hobbyshop and they carry mostly RC fuel so That's what I run in everyting . I hate to buy special fuel for C/L because I burn less than a half gallon a year . I run most of it through RC .

I won some Powermaster YS 20/20 last weekend , 2 gallons of it . will that work in the PIPE? or is 20% nitro too high , or should I stay away from all synthetic fuels.

thanks ,,

 H^^So nitro just controls the punch of the fuel . cool

On the oil side is 20% all synthetic fine?

dont know why Im so worried about fuel ? I am very new to Pipe flight and back in the day I would run anyting that would burn so why an I tripping out over fuel 

I use a basic methanol/castor fuel in my 40/46 VF's and have never felt any need for nitro. Power is more than adequate even with an overweight (72 ounce) model. Personally though I'd never use an all synthetic because I believe it could lead to the dreaded peeling syndrome.

H^^So nitro just controls the punch of the fuel . cool

On the oil side is 20% all synthetic fine?

dont know why Im so worried about fuel ? I am very new to Pipe flight and back in the day I would run anyting that would burn so why an I tripping out over fuel 

    Jason, buddy! Back to the VF, I see. I used 10% SIG Champion (50/50 castor/synthetic total around 18-19%) or 15% Byron "Traditional" ( 25/75 castor/synthetic for ~20% total). I wouldn't have a huge problem with 20 or 22% all-synthetic, but I would be nervous about anything less than 20 *by volume".

    There's nothing wrong with YS20/20, that will work fine. Its expensive and it doesn't provide much advantage, however. Ted ran YS 20/20 at the 2004 WC in a Jett 61, that makes some manly-man HP. I would choose whatever fuel it takes to make sure that there is just the slightest hint of 4-stroking on very rare occasions in level flight with everything else right. Using less nitro will push you further into a 2-stroke, until you start running out of poop lean at the tops of loops or towards the end of a square 8. More nitro will let you run it richer, but with the classic Paul Walker setup you don't want it to get into a 4-stroke other than an occasional missed stroke in level flight (usually coming into the wind). Of course you can play off the nitro, venturi, pitch, and pipe length to get it to work with any degree of nitro. The setup I usually recommend (pretty much straight out of the 1991 Paul Walker "Impact" article) is based on nominally 10% nitro.

    Less nitro also makes it slightly harder to start. I have run 5% but its pretty wimpy that way. I have run as much as Cox "Red Can" Racing Fuel (which I think is 30%), and it ran fine, very strong, and ran out of fuel right after the square 8. You can't destroy the engine in any reasonable setup unless you do something silly. Which I know you would never do.

   Brett