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Todd, Thanks for the comment and it is well received............Unless I hear otherwise from a majority of the group I will then keep all further discussion on the group forum...............As a further note if and when I acquire the mount/backplate under discussion I will probably add it to my "P" port 13BREW that I mentioned instead of the "Mistral" mount/housing that I have......I have a 20B but it would be seriously too much power and weight for my "Dyke Delta" even if the 20B were all alloy housings..........
Thanks Again, Kelly Troyer Hi Kelly; This mount idea is an excellent idea worth pursuing as a practical engine mount is a major roadblock to many builders that are otherwise considering alternative engines. While I'm not currently in the market for one myself, so I hadn't raised my hand to say "count me in", but the future could bring another project where I would be happy to have that availability of a ready to go engine mount. However I'd like to encourage you to keep all further discussion of this topic online. I'd much rather simply delete a conversation that I may not have an interest in, than see the list with no discussion at all as we've seen all too often in the recent past. Any and all discussion pertaining to rotary powered aircraft helps to keep the list active and encouraging to other builders, as well as adding ideas to the archives. The archives have been a gold mine of info for me over the years, sometimes even reading my own comments to give me an insight as to "what the hell was I thinking" when I came up with some failed concept. But more often than not as a source of info for more successful concepts.
Todd C-FSTB RV9 13Bturbo
Flyrotary Forum Members, I appreciate the response of all members to my posts regarding the possible production of an "Aircraft Specific Alloy 13B/20B combination Engine mount/Side plate" that would be a direct bolt in to a Lycoming O/IO 540 "30 degree Dyna 1" engine mount ring.............. There are several aftermarket companies currently producing all the alloy side housings that are necessary for an all alloy 13B/20B for the auto Racing crowd.........What we are trying to do is produce at this time is a front side housing specifically designed with the proper mount points to be essentially bolt in to any aircraft that normally be powered by any of several versions of the Lycoming O/IO 540 engine..........The current plan is to use the RX8 Renesis front cover with its water pump and ignition pickup and retain the stock oil pump........This mount could also be used many other aircraft that normally would use the Lycoming O/IO 320-360 engines by using the Lycoming O/IO 540 mount ring (currently available from "Vans" for about $150.00) with a 13BREW engine (all alloy if wanted)........
This is a project that I have a personal interest in and at this time cannot report a time schedule for its completion.........I have committed for the first "Beta" housing for testing and will keep the forum appraised of progress...........The forum is probably tired of me cluttering it up with this subject so for the time being any of the group that have an interest in this project or have any additional questions or concerns may E mail me directly if they choose..........Thanks for listening...........
Best Regards Kelly Troyer
Guys, More info on the "Glasair 3" in Europe with "Mistral" 20 B based rotary engine.........
Kelly Troyer
Lynn, Forgot to mention what the "Black" plate is.........."Mistrall" took oil from the normally plugged oil galley on the side of the front iron to a machined "O" ringed alloy plate that incorporated the oil filter and a "Vernitherm" (a Continental part I think) to bypass the oil cooler until oil temp got up to about 150 degrees F........I have this plate also..........
Kelly Troyer Marc & Lynn Yes the photo of the "Mistral" 13B engine on the bench is like what my 13BREW will look like except it will have "Racing Beat" alloy center & rear housings and will be "P" ported........Their early 13B engines were based on the 1986-1991 models.............Yes Lynn this is the early mount scheme that combines the alloy mount casting and front cover into one unit that bolts to the front iron and incorporates the water pump and mount for the alternator plus the pickup for their electronic ignition..........It also had provisions for a drive for a vacuum pump.........I did not get the gears for this drive (less expense)(electric airplane) with my housing.........This casting mounts to a "Dynafocal Type 1" Lycoming O/IO 320-360 mount ring.........
Thanks, Kelly Troyer
In both pictures the mount appears to attach to the front iron. And to a cast oil pan and a plate bolted to the left side of the front iron (black plate).............LEH
In a message dated 7/9/2020 1:38:35 PM Eastern Standard Time, flyrotary@lancaironline.net writes:
Great stuff. I saw and read that Kitplanes article with great interest back when.
Here’s some conical mounting back plate pictures I found on my hard drive, I believe they are all Mistral, but don’t know where they came from originally (perhaps Paul Lamar’s group) One is a 13B named ‘Steve’. Hopefully these pics get thru-there is a picture limit on this list that makes it difficult to send larger files, so I didn’t send all of them I have just of the backplate, what is the MB/KB limit here?
Marc
From: Rotary motors in aircraft
Sent: Thursday, July 09, 2020 1:28 AM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: [FlyRotary] Re: Aviation Specific 13B/20B Mazda Front Side Housing
Le Roux,
Thanks for digging this up as it will answer a lot of questions from the group..........This was the final iteration of "Mistrals" alloy side housing / accessory drive
that was headed for US & European certification.........It incorporated the "30 Degree/#1 Dyna Mount Ears" for the Lycoming O/IO 540 engine mount..........This is
what this thread is all about..........My friend is attempting to come up with a less expensive version of this plate but without all the accessory drives and using the
stock RX 8 front cover with stock water pump and ignition pickup (electric airplanes)............Photos are worth a thousand words..........
Kelly : Just saw this on the archive on our group thread you post in April 2011
Only the early "Mistral" 13B/20B based engines used the bolt on front cover/accessory drive alloy cover that had mount points that used the Lycoming O/IO 320-360 "Dynafocal Type 1" mount ring.........I know this
as fact as I am the proud owner of one of these alloy housings.........I have all the housings and parts to build a bastardized part alloy "P port" 13BREW engine.........I retained the cast iron front (Rear in tractor A/C)
side housing because I was not comfortable having my engine hang on its mounts from a housing attached only by several 6 mm bolts threaded into a cast alloy "Racing Beat" front side housing.........All the other
housings (Center & Rear) are alloy "Racing Beat"..........The earliest "Mistral" 20B engines also used this alloy front cover but also had mount points at the redrive end of the engine (Essentially a Bed type Mount) and
only used the bottom two mount points on the accessory end of the engine.........At that point in "Mistral's" engine development the engines they sold to experimenters were basically "Mazda" engines and all their parts
were directly adaptable to a stock "Mazda" engine (such as my engine)............The last iteration of their engines were designed to be certifiable so they had to have a verifiable manufacturing trail..........So they made
engineering changes in their parts to eliminate things about the stock "Mazda" parts that were not needed or were improvements for aircraft use..........Most of the last versions of their engines had parts that were not
adaptable to the stock "Mazda" engines...........Long winded but perhaps will enlighten some about the "Mistral" series of engines..........
Yes Charlie the accessory "iron" side housing is what would be replaced with an aluminum housing with built in mount points that replicate the Lycoming O/IO 540 mount ears and locate the Mazda eccentric
shaft centerline in the same place as the Lycoming crankshaft centerline and make the Mazda a bolt in to any aircraft using the O/IO 540 30 degree "Dyna1" mount system.............
Mark I am well aware of the different opinions on using the rear dyna focal mount on the Mazda.........Bill is correct about the need for .500 in/12.5mm studs and a stiffening plate and/or rigid oil sump to
further resistance to torsional twisting..........But remember that the O/IO 540 family of engines with firewall forward weights of 400+ to over 500 lbs for some turbo models are all using this mount system and
that an all alloy 13B or 20B (even with reduction drive) will be much lighter..........I do not believe that the "Mistral" 13B or 20B used alloy housings for other than the front accessory housing and I have never
heard if they used the oversize .500 inch/12.5 mm studs in any of their engines..........This is probably a question that will have to be proven one way or another in actual use..........IMHO
Wonder why Mistral used dynafocal type mounting on their 13b and 20b designs?
M
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
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..............
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