Don’t forget the oil pan helps some to hold the whole thing together for those of us who don’t have the engine sitting on the mounting plate.  A thinner, “defoaming” plate might be a good idea if you are looking for something to add stiffness to the engine stack using the Mistral design.

 

Bill B

 

 

The tension bolts held everything in the Mistral design.

That is my starting point however its not to say that there couldn't/wouldn't be some added

hardware across the top to help w/ rotational stiffness as well as bending loads if it is warrented. I could see a such an attachement doing several things

for the install, from torsional stiffness [takes out some of the torque loads that are currently held by the clamp force from one housing to the next], as well

as bending stiffness [hard landing load downwards] as well as even interfacing w/ an intake system to lend support there as well.  At this point its all

very much in the air [pun intended]. I will end up doing lots of modeling, some FEA and possibly going as far as getting an engineer to evaluate the whole

thing before we're done. :)

Jarrett Johnson
www.innovention-tech.com

----- Original Message -----

From: Bryan Winberry <bryanwinberry@bellsouth.net>

Date: Thursday, May 5, 2011 9:30 am

Subject: [FlyRotary] Re: Back-plate (93-95 Front Side Hsd Needed)

> Kelly or anyone else familiar,
>
> Maybe I missed it, but what did Mistral do, if anything, to
> support the
> engine forward of the mounting tabs?  Or do the front plate and
> the tension
> bolts bear all the load of the engine, re-drive and prop?
>
> Bryan
>
>
>
>  _____ 
>
> From: Rotary motors in aircraft [flyrotary@lancaironline.net] On
> Behalf Of Bryan Winberry
> Sent: Thursday, May 05, 2011 11:22 AM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: Back-plate (93-95 Front Side Hsd Needed)
>
>
>
> Just got off the phone with Mazmart.  They may have one!  Will
> know for sure
> this afternoon.
>
> Bryan
>
>
>
>  _____ 
>
> From: Rotary motors in aircraft [flyrotary@lancaironline.net] On
> Behalf Of Kelly Troyer
> Sent: Thursday, May 05, 2011 10:42 AM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: Back-plate (93-95 Front Side Hsd Needed)
>
>
>
> Bryan,
>
>
>
>    That would be very helpful..................If you can find
> one let me
> know and I will
>
> make arrangements with Jarrett about where he will want it sent to
> avoidcustoms
>
> and duties as he is in Saskatchewan, Canada.............
>
>
>
> Thanks,
>
>
>
> Kelly Troyer
> "DYKE DELTA JD2" (Eventually)
>
> "13B ROTARY"_ Engine
> "RWS"_RD1C/EC2/EM2
> "MISTRAL"_Backplate/Oil Manifold
>
> "TURBONETICS"_TO4E50 Turbo
>
>
>
>
>
>  _____ 
>
> From: Bryan Winberry <bryanwinberry@bellsouth.net>
> To: Rotary motors in aircraft <flyrotary@lancaironline.net>
> Sent: Thu, May 5, 2011 9:02:32 AM
> Subject: [FlyRotary] Re: Back-plate (93-95 Front Side Hsd Needed)
>
> If Mazmart has one lying around, I could pick it up.  I live in
> the area.
>
> Bryan
>
>
>
>  _____ 
>
> From: Rotary motors in aircraft [flyrotary@lancaironline.net] On
> Behalf Of Kelly Troyer
> Sent: Wednesday, May 04, 2011 7:09 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] Re: Back-plate (93-95 Front Side Hsd Needed)
>
>
>
> To The Rotary Group,
>
>     Yes I know I am a troublemaker (too much computer time
> available with
> my day job) and some of you are probably sick of all my posts
> !!.............."But" with that being said one of our group is
> seriouslyconsidering the development of a "Mistral" type
>
> back-plate to allow the use of a standard "Lycoming" "Dynafocal
> type 1"
> engine mount ring that will be a virtual "Bolt-on" to the
>
> 93-95 13BREW , Cosmo 13B & 20B and the Renesis 13B
> Rotarys.............Several builders and potentials have indicated
> they
> would be interested in such a back-plate (including
> me)............I have
> one of the few "Mistral" back-plates that ended up in the
>
> hands of experimenters (waited 2 years for it)..........It is
> severely over
> engineered for our use (and overpriced) and has many
>
> features we do not need...........
>
>
>
>    If you have followed "Back-plate" string of posts recently you
> know that
> Jarrett Johnson one our group with aspirations to
>
> install a Cosmo 20B in his project started the discussion first
> about an
> developing an intake manifold for 13B & 20B Rotarys
>
> (which needs to be done also) then I jumped in and said that a
> common engine
> mount design might also be needed and if
>
> you have been reading the posts lately a lot of info has been
> kicked around
> about the various Rotarys and what it will take to "Marry" the
> "Mistral"back-plate with a "RX8 "Renesis" water-pump (with the
> magic of digital
> scanning & CAD) to design
>
> such a back-plate.........
>
>
>
>     Those that have been on the Rotary forum for several years
> may remember
> Jarrett posting his trials and tribulations in
>
> building a huge CAM mill (at home).............He is a commercial
> designerwith the talent and equipment (including foundry)
>
> to pull this off............I have offered my "Mistral" back-plate
> to be
> scanned (He trying to find someone here in Okla to do
>
> the  job) and I also have a "Renesis" front cover to
> scan............What we
> really need now is a 93-95 13BREW front side
>
> housing (unusable condition preferred as long as front side is
> undamaged) to
> put in his hands as this is what the back-plate
>
> will bolt to..............If someone in the group has an unusable
> 93-95
> 13BREW front side housing they will donate I will pay
>
> to have it shipped to Jarrett..............You may contact me off
> the forum
> if you would prefer..........I have no horse in this race
>
> I would just like to see such a product be made available to the
> group..........
>
>
>
> keltro@att.net
>
>   
>
> Kelly Troyer
> "DYKE DELTA JD2" (Eventually)
>
> "13B ROTARY"_ Engine
> "RWS"_RD1C/EC2/EM2
> "MISTRAL"_Backplate/Oil Manifold
>
> "TURBONETICS"_TO4E50 Turbo
>
>
>
>
>
>  _____ 
>
> From: Kelly Troyer <keltro@att.net>
> To: Rotary motors in aircraft <flyrotary@lancaironline.net>
> Sent: Tue, May 3, 2011 11:45:09 PM
> Subject: [FlyRotary] Re: Back-plate
>
> Jarrett,
>
>
>
>    Will be a good idea to scan both the Mistral and Renesis
> housings.............You really need
>
> a 93-95 13BREW (preferably) or Cosmo 20B front housing to
> scan.............Most of my 13B
>
> engines are 86-91.............My Cosmo 13B is adaptable but lacks
> some of
> the machined bolt
>
> and stud pads of the 13BREW, Renesis or Cosmo 20B front side
> housing which
> you need
>
> to make allowances for on the redesigned back-plate if you want it
> to fit
> all three versions of
>
> these engines..................Throw this out to the group and see if
> someone has a 1993-95
>
> 13BREW front side hsg (need not be usable) they would donate or
> lend to the
> project.........
>
>
>
>   You really need this front side housing in front of
> you......... Even
> with all the scans nothing
>
> beats having the actual hardware............IMHO
>
>
>
> Best Regards,
>
>
>
> Kelly Troyer
> "DYKE DELTA JD2" (Eventually)
>
> "13B ROTARY"_ Engine
> "RWS"_RD1C/EC2/EM2
> "MISTRAL"_Backplate/Oil Manifold
>
> "TURBONETICS"_TO4E50 Turbo
>
>
>
>
>
>  _____ 
>
> From: H & J Johnson <hjjohnson@sasktel.net>
> To: Rotary motors in aircraft <flyrotary@lancaironline.net>
> Sent: Tue, May 3, 2011 10:43:03 PM
> Subject: [FlyRotary] Re: Back-plate
>
> Evening Kelly, so just thought I'd send a note w/ an update. I did
> find a
> fella in Tulsa who has access to a laser scanner. He's getting me some
> pricing
>
> on what it would cost to get the job done. I'm thinking it might
> be a good
> idea to get both the Mistral housing as well as a Renisis Front Cover
> scanned?
>
> I'd like to get an Iron [preferably the side that mates to the
> front cover]
> scanned as well but don't know if you've got one handy [as in, not
> 'in' an
> engine]. I could always
>
> do it here in time but that might take a bit before I get my hands
> on one
> that is not in an engine.
>
>
>
> I'll keep you posted as this goes and see where we get.
>
> Jarrett Johnson
> www.innovention-tech.com <http://www.innovention-tech.com/> 
>
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> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>

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