[QUOTE]Originally posted by Richard L.
The YS .91 can swing a 15x8 apc at 9300 rpm on YS 20/20 fuel. That's over 13 lbs. of static thrust. [/QUOTE

That would be approximately equal to a 1.08. But if that fits then maybe a 2 stroke 1.2 would also. OS, Magnum, ASP, TT all make either the 1.08 or 1.2 size. ASP and Magnum are the same engine, but early ASP's had high comperssion requireing low nitro fuel. That is the only problem with early ASP engines.