effect of changed thrust line.

On Fri, 14 Nov 2008 16:16:21 -0600, cavelamb himself
wrote:

wrote:


Lowering the thrust line to below the center of aerodynamic drag would
cause nose up - OK I get that. Now where is the center of drag on a
peg? and it will DEFINETLY change with flying attitude - ie with the
flaps on, or the slats extended.

I guess what it boils down to is it will not be a HUGE effect.
On a 28" long engine, 3 degrees is roughly 1.5" offset, so 1/4" is
roughly 1/2 degree. One 1/8" washer at the firewall and one at the
engine rubber on both sides will make 1/2 degree change if I need to
do a bit od "fine" tuning.

Spec for the O200 mount is 1.5 degrees down IIRC,amounting to .75"
offset - guess I'll put in about .875 and see what happens

I thought about this a bit last night.
And a couple of thoughts seemed worth relaying.

First, (and most obviously) a new mount will be needed.
So build it as close as you can guess to what you'll need.

Adjusting the mount at the firewall end strikes me as a bit "iffy".

More that a washer or two makes for a noticeable misalignment between top
and bottom bolts. When torqued down, something it GOING to give.

Either the mount gets twisted or the firewall support structure does.
Or both?

The engine end, if rubber cushioned would be a lot more compliant.
Might consider all that when designing the new mount.

The Corvair would use a bearer style mount, wouldn't it?

Not on this plane. I'll get pics of the mount design on line soon.
I've put mounting tabs on the top and bottom rear so I'm mounting it
like a Conti O200, but using 1" diameter Licoming type homebuilder
mounts.The typical bed mount would interfere with my 180 degree header
system.

Rubber pads front and rear would give quite a bit of adjustment room.

I think Stealth got it right.

Same side alignment and a touch more down.

wrote:

The Corvair would use a bearer style mount, wouldn't it?


Not on this plane. I'll get pics of the mount design on line soon.
I've put mounting tabs on the top and bottom rear so I'm mounting it
like a Conti O200, but using 1" diameter Licoming type homebuilder
mounts.The typical bed mount would interfere with my 180 degree header
system.



How will the mount attach to the engine case?
I don't recall how the aft end of the engine is arranged.






--

Richard

(remove the X to email)

On Fri, 14 Nov 2008 22:53:23 -0600, cavelamb himself
wrote:

wrote:

The Corvair would use a bearer style mount, wouldn't it?


Not on this plane. I'll get pics of the mount design on line soon.
I've put mounting tabs on the top and bottom rear so I'm mounting it
like a Conti O200, but using 1" diameter Licoming type homebuilder
mounts.The typical bed mount would interfere with my 180 degree header
system.



How will the mount attach to the engine case?
I don't recall how the aft end of the engine is arranged.


I'll get pictures, but I used a chunk of auminum channel, cut away to
make a "U" shaped bracket that bolts to the top surface of the engine
case, with "ears" to which mounting blocks are fastened, immitating
the top ears of an O200 case. The bottom has an angle boted down each
side, like the typical bed mount but without rubber isolation, with
mount blocks fastened to them as well,.

Very similar to the way it is mounted on my engine test stand,
pictured on my website.

On Sat, 15 Nov 2008 11:46:10 -0500, wrote:

On Fri, 14 Nov 2008 22:53:23 -0600, cavelamb himself
wrote:

wrote:

The Corvair would use a bearer style mount, wouldn't it?


Not on this plane. I'll get pics of the mount design on line soon.
I've put mounting tabs on the top and bottom rear so I'm mounting it
like a Conti O200, but using 1" diameter Licoming type homebuilder
mounts.The typical bed mount would interfere with my 180 degree header
system.



How will the mount attach to the engine case?
I don't recall how the aft end of the engine is arranged.


I'll get pictures, but I used a chunk of auminum channel, cut away to
make a "U" shaped bracket that bolts to the top surface of the engine
case, with "ears" to which mounting blocks are fastened, immitating
the top ears of an O200 case. The bottom has an angle boted down each
side, like the typical bed mount but without rubber isolation, with
mount blocks fastened to them as well,.

Very similar to the way it is mounted on my engine test stand,
pictured on my website.


OK guys, the pictures of the mount are up on my website at:
http://www.pegazair.on-the-net.ca/Cl...ared/Mount.htm

Drop by and take a gander. You can get to the rest of the project from
there as well.

On Sun, 23 Nov 2008 17:51:18 -0500, wrote:


OK guys, the pictures of the mount are up on my website at:
http://www.pegazair.on-the-net.ca/Cl...ared/Mount.htm

Drop by and take a gander. You can get to the rest of the project from
there as well.

that is either a bloody big aeroplane or the wife is the cutsiest
little thing.
her washing line is half the height of the rudder!!


......yeah I know. it was taken from the second floor....

nice workmanship. thank god you're not a simmer!
Stealth Pilot