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Avatar User Offline fwjeff
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Posted: September/02/2019 at 4:18pm  Quote
 
Sad to see the damage, she was a beauty! Glad to see the repairs well under way!

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Avatar User Offline kuhn
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Posted: September/17/2019 at 10:01am  Quote
 
So after a few weeks of producing my Brian Taylor Typhoon kits for Sarik Hobbies it's back to the re build.

Next up was to re-establish the exact engine thrust line for the OS 120 E so I could get the cowl nose ring and spinner back plate positioned.

To mount the engine I used two 20 mm x 20 mm aluminium angles as beams with the old aluminium crush plate as a spacer just behind the engine. These ran from the back of the tank bay box forward and was glued and screwed to the top of the tank bay box.

Pic below of engine bearer beams and the spacer.


Engine bearer beams.


Still nice and level.


Spinner back plate positioned.


Engine bearers being glued in. Later countersunk screws where added.


I made these to hold the engine securing bolts. Old idea to stop bolts turning when tightening the nuts.


Engine being trial installed.


The old brass tube engine braces were re-used. 
Tank positioned to see where the inlet lies relative to the carb spray bar.


Retract air bottle sits here in a cradle shaped to hold it. Siliconed into place.





Air flow from the cowl front, over the engine and out the bottom 
was achieved by following the full sized principle. Formers were dremelled to create apertures.


A shelf, just above the tank bay box floor (fuselage is up side down) 
was made up against former 3. The flight batteries will live here and be 
accessible from the wing seat area. 


This area was planked and will be glassed against oil from the engine bay.
The flight batteries sit in that cone shaped area.


That's it for now. Wing seat area next.






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Building: Getting my Mo Jo back slowly to finish a few projects.
 
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Avatar User Offline Sparky
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Posted: September/17/2019 at 11:12am  Quote
 
The idea of the diagonal brace looks good. What is the material being used? Have you done this successfully in the past?
The crimped ends are a weak point and likely to fracture from vibration.
I would suggest for your consideration using a section of your angle aluminum piece just cut off the angle part so you have a flat piece of aluminum and run it from the side of you angle aluminum motor mount up front back to the firewall where it attaches to a block on the firewall so it doesn't have any bends.

Sparky

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Avatar User Offline kuhn
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Posted: September/17/2019 at 11:34am  Quote
 
Sparky,

Thanks for the concern.

Those are over 21 years old and survived the crash.

They are hollow brass tubing about 4.5 mm in diameter. 

The ends have been flattened and silver soldered after the holes were drilled.

The soldering was run up past the bends as well. Very strong.

Where they are bolted to the fuselage the the bolts run through rubber grommets to aid in damping vibration.




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If in doubt. Don't!
Flying: HIGH!
Building: Getting my Mo Jo back slowly to finish a few projects.
 
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Avatar User Offline dd71
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Posted: September/17/2019 at 2:40pm  Quote
 
nice and neat work Khun!!! some time is necessary for start a repair/rebuilding but at the end, when she flays again ... 
Cheers
Daniele


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