Pinning the firewall - 50cc SBach - RC Groups
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Jan 07, 2013, 10:22 PM
Illegitimi non carborundum
grosbeak's Avatar
Discussion

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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Jan 07, 2013, 10:27 PM
Illegitimi non carborundum
grosbeak's Avatar
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.



Jan 07, 2013, 10:33 PM
Illegitimi non carborundum
grosbeak's Avatar
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.

Jan 07, 2013, 10:37 PM
Illegitimi non carborundum
grosbeak's Avatar
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.

Jan 07, 2013, 10:43 PM
Illegitimi non carborundum
grosbeak's Avatar
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
Jan 08, 2013, 07:27 AM
Registered User
rjstrickjr's Avatar
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!
Jan 08, 2013, 09:30 AM
Zor
Zor
Suspended Account
grosbeak,

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

Zor
Jan 08, 2013, 12:03 PM
Illegitimi non carborundum
grosbeak's Avatar
Quote:
Originally Posted by Zor
grosbeak,

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

Zor
Zor, done and replied - thanks!
Jan 11, 2013, 02:09 AM
Who Dat!
GeetarJoe's Avatar
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.
Jan 11, 2013, 06:32 AM
Illegitimi non carborundum
grosbeak's Avatar
One mountain, many paths. Thanks Joe!


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