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Old Jan 07, 2013, 10:22 PM
Illegitimi non carborundum
grosbeak's Avatar
Canada, ON, Ottawa
Joined Mar 2011
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Pinning the firewall - 50cc SBach

I've seen many recommendations on pinning the firewall. When I first heard about it I had no idea what was involved, and it wasn't until I got a giant scale airplane that I saw the light. I knocked this job off in about fifteen minutes (including time for photos).

Step 1 - Mark the locations for the pins

Using a ruler and eyeballing from diagonal corners of adjacent tenons, I made an X between each.



Next, I used an awl to mark the points for drilling.

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Old Jan 07, 2013, 10:27 PM
Illegitimi non carborundum
grosbeak's Avatar
Canada, ON, Ottawa
Joined Mar 2011
1,503 Posts
Step 2 - Drilling the holes

I saw a recommendation for bamboo skewers as pins - I picked up a package of 100 at a local supermarket. Before I could drill the holes I needed the diameter:



I marked the drill bit at 15mm and drilled the holes.



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Old Jan 07, 2013, 10:33 PM
Illegitimi non carborundum
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Canada, ON, Ottawa
Joined Mar 2011
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Step 3 - Prepping the pins and the holes

For the six holes I cut six pins, each about 20mm long. I cut the tip off the skewer first.



I opted for Chair Doctor glue from Lee Valley, designed to swell the wood in the joints.



I little squeeze in each hole did the trick.

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Old Jan 07, 2013, 10:37 PM
Illegitimi non carborundum
grosbeak's Avatar
Canada, ON, Ottawa
Joined Mar 2011
1,503 Posts
Step 4 - Installing the pins

I used a wooden mallet to tap the pins into place.



Once they were in, out came the trusty flush cut saw.



Presently the job was done...



... with skewer to spare.

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Old Jan 07, 2013, 10:43 PM
Illegitimi non carborundum
grosbeak's Avatar
Canada, ON, Ottawa
Joined Mar 2011
1,503 Posts
Summary

A fast, easy and almost free modification. The items involved are listed below; those with an accompanying price I didn't already own and had to purchase.

Parts
- Skewers ($1.99)

Tools
- Pencil
- Ruler
- Awl
- Drill
- 7/64" drill bit
- Mallet
- Flush cut saw

Supplies
- Sandpaper
- Glue
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Old Jan 08, 2013, 07:27 AM
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United States, NC, Faison
Joined Jan 2011
687 Posts
Welcome to giant scale and thanks for the thread.

This should also be done even on the smaller planes. The folks at my flying club pin all their firewalls, just makes sence. A 15 minute job can save a an airplane from dropping like a rock and destroying your hard work and pride!
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Old Jan 08, 2013, 09:30 AM
Zor
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Ontario,Canada
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grosbeak,

Have a look in the other thread "pinning firewall" where you posted a link to this thread.

Zor
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Old Jan 08, 2013, 12:03 PM
Illegitimi non carborundum
grosbeak's Avatar
Canada, ON, Ottawa
Joined Mar 2011
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Quote:
Originally Posted by Zor View Post
grosbeak,

Have a look in the other thread "pinning firewall" where you posted a link to this thread.

Zor
Zor, done and replied - thanks!
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Old Jan 11, 2013, 02:09 AM
Who Dat!
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United States, LA, New Orleans
Joined Sep 2011
650 Posts
great writeup, and good job.

you can also use toothpicks, servo screws, bits of carbon rod, hardwood dowel, etc. whatever strikes your fancy. i use toothpicks. i just drill a 1/16 hole, dip the toothpick in gorilla glue, and then shove it in. let the glue cure and cut them off. same thing for the hardwood dowel. for the carbon rod, rough it up and then use epoxy. for servo screws, you can drill a 1/16 hole, dip the screw in titebond, and then screw that puppy in.
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Old Jan 11, 2013, 06:32 AM
Illegitimi non carborundum
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Canada, ON, Ottawa
Joined Mar 2011
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One mountain, many paths. Thanks Joe!
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