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"Wonder why Mistral used dynafocal type mounting on their 13b and 20b designs?"
Completely makes sense to me. Most of the kit and certified aircraft were already using dynafocal mounts for the certified engines. The plan was to make it easy to install the Mistral engine instead. They did not modify the front end housing (as in the current proposal), but they built a custom front cover that connected to the dynafocal mount and also provided for an alternator and vacuum pump. It looked like a really nice item and would have made home rolled rotary installations much simpler too. A modified front side-housing would be a nice option but the front cover has the advantages of being easier to make and fit. it could also be installed without disassembly of the whole engine. But it did seem to me like it would put quite a stress on the bolts going into the front side-housing.
Dave Leonard
Wonder why Mistral used dynafocal type mounting on their 13b and 20b designs? M Sent from my iPad Kelly, The "dynafocal" type mount has been tried on the rotary but has not worked out well..One of the obvious rotary traits is that it has a hot and cold side. Various methods have been used to limit this but there is no way to eliminate it completely. Because of this the engine tends to "work" and move around on the studs. Using the engine as a stressed member is not recommended with the rotary. If you were to do this anyway I wouldn't do it without a stud kit. You will have better results using a bed mount. YMMV Bill Jepson I am in contact with a person with the design and manufacturing capability to produce an Aviation Specific 13B/20B Mazda Front Side Housing machined from 7075-T6 with mount points that would allow these engines
to be a bolt in to the engine mount ring (30 degree number 1 Dyna) as used by the "Vans" RV-10 and other aircraft that use the Lycoming O/IO 540 engine..........This side plate is in the preliminary design stage and at this
point I am a go between to see if there would be any interest in this product if and when it is produced...........I personally am interested this side plate........As we on this forum know both the 13B / 20B are capable of truly
amazing power levels both naturally aspirated and turbo boosted.........The 20B would make the Van's RV-10 , Glasair 3 or Lancair's that use the Lycoming O/IO 540 an easy 300+ hp almost bolt in engine...........
The "Reno" Sport Class "Glasairs" and Lancairs" are producing almost 400 mph speeds using dual turbo Lycoming IO-550 engines that are virtual hand grenades pulling over 700 hp...........There are turbo 20B's pulling
1200 hp out in the auto racing world with good reliability..........A 20B boosted to 700+ hp is not even breathing hard.........IMHO
Would like to hear what interest there may be in this product if and when it may be produced............Or any comments pro or con..............
-- Kelly Troyer
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