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Author Topic: My second Perky  (Read 426 times)
Paul Smith
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« on: March 18, 2017, 02:11:01 PM »

I put together my first Perky in about three weeks and it lasted me 12, maybe 13 years. 
I've broken ground on a replacement. 
Second verse, pretty much like the first.

I use a wood pan type of construction.  The original has held together OK with three 4/40 bolts.  The new one will have two 3 mm bolts.  I've gone metric via Bob Hornberger (father of State Rep Pam) of Metrics Unlimited.

Step One is crudeing it in like a Viking ship.
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Paul Smith

Paul Smith
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« Reply #1 on: March 18, 2017, 02:12:33 PM »

Step Two is to go out the frozen barn and run it by the belt sander.

As you might notice, some old aluminum engine mounts have been buried to give the engine something to sit upon.

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« Last Edit: March 18, 2017, 04:23:11 PM by Paul Smith » Logged

Paul Smith
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« Reply #2 on: March 18, 2017, 07:20:13 PM »

Please explain the big rib little rib concept.
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« Reply #3 on: March 18, 2017, 08:02:32 PM »

Paul,

Nice planking.  Grin

CB
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Paul Smith
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« Reply #4 on: March 19, 2017, 04:52:31 AM »

Big ribs?  Sure.

I layed up the wing from scrap wood and plan to sand it to shape on the belt sander, much as you would with one big piece if 1/2" balsa, but a little lighter and MUCH less expensive.

Since the ribs will be sanded down thin, I made them wide so as to hold the LE & TE together.  Also, I made them even thicker on the outboard side, since I'll be adding even more tip weight.

The other photo was the top of my first Perky during a rehab.  The principle will be the same on this model.
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Paul Smith
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« Reply #5 on: March 19, 2017, 07:21:39 AM »

Lookin' good Paul!  There are a couple new ones taking shape in N.J. too.
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bob whitney
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« Reply #6 on: March 19, 2017, 12:10:42 PM »

Florida also y1
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john e. holliday
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« Reply #7 on: March 19, 2017, 02:58:01 PM »

Why not leave out board solid and save tip weight?   I need to start on my Perky if I can find where I misplaced them.  Have a Cox that should work.
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Paul Smith
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« Reply #8 on: March 19, 2017, 06:00:01 PM »

That's a thought.  I did go somewhat heavier on the outboard.  But lead nearer the tip has more leverage that wood near the body. 

It only has 9" of wing on each side.  With the pointy tips, you can't get the weight much more than 8" out, so it takes a fair bit to keep it from torquing in.

The leadout guide has a similar issue.  You can only get it about 8" inside the CL and it needs to be ahead of the LE for best results.
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Paul Smith
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« Reply #9 on: March 19, 2017, 06:03:10 PM »

I assume the new Perkys are scratch built, or does Blackhawk new owner still offer kits?
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Paul Smith
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« Reply #10 on: March 19, 2017, 07:31:48 PM »

Mine are built from plans.
The Black Hawk Perky was rather popular.  You might find one on the aftermarket.
Here is the plan.  
With an 18" wingspan as a  guide you can get it printed to size.
There's a lot left to the imagination, including the bellcrank & leadouts.
People respected Jim Walker's lawyers.
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Paul Smith
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« Reply #11 on: March 22, 2017, 05:02:57 PM »

Let me think about this step-by-step:

1. Chose the engine.
2. Bottom
3. Landing gear.
4. Wing
5. Top
6. Tailplane.
7. Flight controls.
8. Fuel tank.
9. Final assembly
10. Paint
11. FLY

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Paul Smith
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« Reply #12 on: March 22, 2017, 05:05:40 PM »

After a few passes of the sander...
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Paul Smith
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« Reply #13 on: March 23, 2017, 07:40:25 PM »

Some of the rough edges smoothed-out and carbon veil applied.
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Paul Smith

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