RE: Bernard Dumas' Canadair CL-215  
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RE: Bernard Dumas' Canadair CL-215 - 10/4/2006 4:54:02 PM   
Kmot



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Ciao Giacomo! Any more updates?

-Tom

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RE: Bernard Dumas' Canadair CL-215 - 10/6/2006 3:39:02 PM   
g_boxwood



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Quite busy right now ...

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RE: Bernard Dumas' Canadair CL-215 - 10/8/2006 10:34:58 PM   
Kmot



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Understood. I know how it can be sometimes! Ciao.

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RE: Bernard Dumas' Canadair CL-215 - 12/19/2006 5:31:31 PM   
g_boxwood



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Hi gentlemen!

Christmas time inspired me to get back to the long-abandoned building board for some more dust-time!

Sheeting the hull ahead of the step

A rather uncomplicated matter given the simple shape but... things got though approaching the nose. Rememeber I couldn't bend those very soft 5x5 balsa sticks?

I wanted to run one(*) balsa sheet from the step to the nose but I couldn't. Bending the grain was really too much -close to the nose-. I decided to end the parallel-grain sheeting up to bulkhead C20 and continue with cross-grain from there on.

I added some scrap balsa (red arrows) around the bulkhead where they'd meet (green line) to provide better support and anchoring.

After-thought: a better (and too late) way to sheet it is to end the parallel-grain up to a point where a single cross-grain sheet would be required. Bending is indeed critical but only -really- close to the nose. Hull will be fiberglassed so it isn't really a structural matter... Additional support (scrap balsa) is advised anyway.

Sheeted with Gorilla Glue, applying pressure with the custom-bar sander and masking tape. Remember GG foams... make sure things stay where they belong...

(*) Hull width requires you to join balsa sheets to cover it in one piece. I prefer to do it prior to sheet for a better surface at the joint.

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RE: Bernard Dumas' Canadair CL-215 - 12/19/2006 5:38:26 PM   
g_boxwood



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The cross-grain sheeting bends easily and follows the composite curvature of the hull up to the nose given the appropriate amount of -help-.

Gorilla Glue really turned out fantastic for this kind of jobs: fills the gaps, sands easily and is both light and strong!

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RE: Bernard Dumas' Canadair CL-215 - 12/19/2006 5:45:07 PM   
g_boxwood



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The last 2 sheets were glued at the same time.

Everything was then trimmed masking the thin 1.5mm sheeting itself.

I'm satisfied with the results. Except for the sheeting pattern.

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RE: Bernard Dumas' Canadair CL-215 - 12/19/2006 5:59:29 PM   
g_boxwood



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Wing holding plates (WHP)

They're 10mm ply and should be placed at the locations shown on the plans.

They look rather beefy so lightnening holes will be drilled once wing attachment is completed.

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RE: Bernard Dumas' Canadair CL-215 - 12/19/2006 7:45:39 PM   
g_boxwood



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quote:

ORIGINAL: g_boxwood
After-thought: a better (and too late) way to sheet it is to end the parallel-grain up to a point where a single cross-grain sheet would be required.

Just added a pic to clarify a bit what I mean (lower pattern). Or at least this is what I hope... Dotted lines denote joined sheets.

I need advise on splash rails: are they needed? I saw a few model designs feature them.

Do they:
- improve water handling?
- prevent water from hitting the props?
- help get onto the plane quicker?

Thanks,


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RE: Bernard Dumas' Canadair CL-215 - 12/19/2006 8:30:14 PM   
Strykaas



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Great !

quote:

need advise on splash rails: are they needed? I saw a few model designs feature them.


They are even used on the real ones : "prevent water from hitting the props?"



What is Gorilla glue btw ? Any link ?

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RE: Bernard Dumas' Canadair CL-215 - 12/20/2006 7:35:01 AM   
g_boxwood



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quote:

ORIGINAL: Strykaas

Great !

What is Gorilla glue btw ? Any link ?

Thank you, Strykaas.

[GG is a polyurethane glue, you can find more in this thread (page 2, posts #46 and #47)

http://www.rcuniverse.com/forum/m_4400160/mpage_2/key_/tm.htm

and in this useful post that stresses how every kind of gluing job needs a -specialized- adhesive (IOW you can't use GG instead of -every- other adhesive):

http://www.rcuniverse.com/forum/m_3895442/anchors_3895442/mpage_1/key_gorilla%252Cglue%252Cconcerns/anchor/tm.htm#3895442

I suggest reading post #49 directly.]


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RE: Bernard Dumas' Canadair CL-215 - 12/20/2006 10:44:43 AM   
Strykaas



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Thanks !

Here is the pictures I wanted to post :





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RE: Bernard Dumas' Canadair CL-215 - 1/7/2007 2:36:47 PM   
g_boxwood



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Happy new Year to everyone! I know I'm late but I've been away... from town and ADSL...

Although I was away from my workshop I did my homework and CAD modeled the MAIN GEAR: I basically drew again all the components already drawn by Bernard just to get a better understanding of the involved cynematics. Again, everything is very well thought-out and the gear looks incredibly scale as well (check out previous Strykaas pic)!

I first modeled the gear in Rhinoceros and here are the resulting renderings.

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RE: Bernard Dumas' Canadair CL-215 -