RE: Which engines for Open B?
Engine Stats All on Mouse can pipes and 9X4 MA props
OS .25FX Consistantly 18.5K
Irvine .25 Consistanly 18.4K
Mag .28 Varies a little 18.2-18.8K
Norvel Big Mig .25 Who Knows (pretty inconsistant) 18.0K-19.4K At the higher rpms that the Novels run at you will be forced to run a bladder fuel tank. Standard tanks will foam uncontrollably and you probably won't even get them to run. This adds slightly to the cost and complexity but I now run bladder tanks on all my planes for greater consistancy. The Mags also have slightly lower grade Con rods and I have seen several break hitting high rpms yet it is still a good choice. Parts for Mags are dirt cheap also.