Hello!!
Is there enyone else who has the same trouble with the engine mount??
I am placing the mount on the frame # one, and the right lower bolt mount hole is 3 mm shorter than the others. Is there somone else with the same problem??
And is ther someone with ide to fix it? Alu. Shim? Plywood shim??
Looking forward to hear from you.
Best regards.
Bjørn Brekke.

Do you mean that it doesn't touch the frame?
Not quite sure of what you mean here.

The frames that Sequoia ship are a bit distorted and need a bit of a "tweek" to get them to line up.. In fact I complained to Alfred about this and he wrote something in the builders letter about me being a moron basically..

His reasoning was that they get distorted in manufacture.. which I would agree with but I also don't think there are made very accurately but then again.. I AM a moron !

It sounds to me that Bjorn means that with the four little aluminium mounting blocks fitted to the face of frame no.1 he can only get the bolt that connects them to the engine mount through 3 of them. (That's pretty much what you've said GR)

If this is the case there must be a twist in the mount or the frame, or both.
If it is the frame and it's already glued into the airframe straightening it won't be possible now.

If it's the engine mount I'd just shim it with a plywood packer glued to the face of the frame. Actually, use two packers each 1.5mm thick - one under the lower right and one under the upper left to minimise any out of square issues.

If you'd prefer not to use packers it might be possible to straighten it with heat, but you need to ensure you don't stuff up the alignment of the nose gear steering point and the NG retract pivot points.

All of the foregoing assumes we've correctly interpreted what you mean Bjorn - if not, can you post a photo of the problem?

I'm also a bit confused on the exact problem your having (could be that moron thing, there's more then one out there!) but I do recall the engine mount being a big pain as it was, to be kind, most certainly not exact to plans! ...... Did take quit a bit of twisting and swearing to get the whole thing correct.

Duane

Rob!!
You hit the nail on the head!
I have lined the frame # 1 on a plane table and there is no twist. And the one right lower bolt hole on the mount is ca 3 mm from reathing the hole in the bracket bolted on the frame. Seams like a good ide to shim under the framebracket using plywood.
Regards.
Bjørn!

Yeah.. that sounds like a Sequoia mount.. Alfred swears it is correct but that is the same issue I had and it sounds like Duane too.

By the time you get that thing wedged in, I think the bolts are there just for show...


DR

Bjorn,

After thinking about this some more I remembered that mine was also a little distorted.

Mine is a little different in that I made it with just a single bolt at each corner, but after it was fully welded by the local aircraft certified welder one pad didn't quite touch the firewall. I just bolted it on and it pulled into shape.

This is it before final welding:


Maybe you can just fit the offending corner block to the mount first and then bolt it to the firewall, pulling everything into alignment. Of course frame no. 1 will have to be glued into the airframe first!

Hi again!
Regarding the engine mount! I clampt it to a plane table and bolted right upper legg at the exact possision. Then i just pulled by hand the other legs at the right possision and bolt it to the table. Ewery thing lock ok and its spot on center.I just have to live with the twist but it as i say, its perfekt when its mounted and thats what matters. I just wonder abouth one thing In sawdust on seqair.com i red somthing abouth ( trust line at 20 WL) not realy know what thats meens but in the builders manual its only refer to drawing A14 on the instalation of the engine mount so i have to stick to that.
Thanks for your help so far.
Regards.
Bjørn

Bjorn,



Your quote should actually read " . . . at -20WL"

It means that the centreline of the engine is 20mm below WL:'0' so when you set up the engine mount on frame No 1 the centreline of the 4 engine mount rings, when projected back onto the face of frame No 1, should pass through a point that's on the vertical centreline of the fuselage and is 20 mm below WL'0'.

The attached photo shows how I managed it when fabricating the mount - note the cotton lines connecting opposite engine mount rings to form a cross in the centre. A plumb-bob was then dropped down to locate the point 20mm below WL'0'

If you already have Frame no.1 fitted to the fuselage you'll have to find a way to project the "crosshairs" horizontally back to the frame.