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  • November 21, 2017, 03:09:00 AM

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Author Topic: PDK Mockingbird SSR kit update  (Read 1782 times)

Offline bill bischoff

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PDK Mockingbird SSR kit update
« on: May 03, 2017, 08:52:03 PM »
I am currently building a PDK Mockingbird SSR and evaluating the kit. I decided that I wanted to use internal line connections on my model, so I made two changes to the wing. First, I moved the bellcrank mount to the front side of the spar. This makes the lines exit the wing straighter. Second, since I wanted to access the line buttons from the bottom side of the wing, I turned the spar and ribs upside down and built the wing with a suspended bellcrank mount rather than upright.

Pat has changed the design of the ribs to reflect the forward bellcrank position, and as before, the wing can be built with either the upright or suspended bellcrank mounting depending on how the parts are oriented.

As an FYI, the cable in the outboard wing will go to the fuel shutoff. Since it connects directly to the bellcrank, it has to be extremely smooth and free moving to not create drag in the control system.


Offline BillLee

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Re: PDK Mockingbird SSR kit update
« Reply #1 on: May 04, 2017, 05:09:19 AM »
A small extra belcrank in the outboard wing instead of the long cable might be an alternative for the shut-off link.

Also wonder why there isn't a slip joint in there somewhere so that the shut-off link doesn't move except when the down control is used.
Bill Lee
AMA 20018

Offline bill bischoff

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Re: PDK Mockingbird SSR kit update
« Reply #2 on: May 04, 2017, 12:09:05 PM »
You're right. A simple reversing bellcrank through the center rib would have been better and easier. I may try to retrofit something.  H^^
But keep in mind the post was actually about the bellcrank mount!
BB

Offline Matt Spencer

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Re: PDK Mockingbird SSR kit update
« Reply #3 on: May 04, 2017, 05:55:08 PM »
And a mighty fine bellcrank mount it is too . . .

but what the heck is a
Quote
PDK Mockingbird SSR
.   S?P

Offline bill bischoff

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Re: PDK Mockingbird SSR kit update
« Reply #4 on: May 04, 2017, 08:32:50 PM »
PDK= Pat D King, the person who made the kit
Mockingbird= the name of the airplane
SSR= Super Slow Rat , the event for which the plane was designed

Offline Motorman

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Re: PDK Mockingbird SSR kit update
« Reply #5 on: May 08, 2017, 12:43:28 PM »
There's allot of cable outside that jacket. If that kinks you'll be stuck in down elevator. Also, I like my pushrod to be pull for up for a solid up elevator.


MM
There will be a sunny day and we will fly our airplanes.

Offline bill bischoff

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Re: PDK Mockingbird SSR kit update
« Reply #6 on: May 08, 2017, 01:19:47 PM »
True enough, but the fuselage dictates that the internal control horn be on the bottom. The internal pushrod won't have much room to flex.

Offline bill bischoff

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Re: PDK Mockingbird SSR kit update
« Reply #7 on: June 24, 2017, 09:23:49 PM »
Ready for fillets, then paint. Z-poxy finishing resin and 1.5 oz glass on the wood, Fibafilm (like Micafilm) covering. Finish will be Klasskote. Should be ready for the NATS.

Offline Lyle Spiegel

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Re: PDK Mockingbird SSR kit update
« Reply #8 on: June 28, 2017, 02:43:20 AM »
what do you use for BC? Looking for BC to use in Perky. Thx
Lyle Spiegel AMA 19775

Offline bill bischoff

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Re: PDK Mockingbird SSR kit update
« Reply #9 on: June 28, 2017, 06:50:38 AM »
I have a stash of Fox and Veco bellcranks. When they're gone, I guess I'll have to make my own.  ???

Offline bill bischoff

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Re: PDK Mockingbird SSR kit update
« Reply #10 on: July 12, 2017, 08:42:13 PM »
I just finished my Mockingbird. I actually built it dual purpose, for AMA Slow Rat AND Super Slow Rat. It has interchangeable engine mount plates and fuel tanks. This is the AMA Slow Rat configuration. It has a Weston UK (Webra) 25. I have no idea if it will be worth a darn. Most of the time, it will have a Brodak 25 for SSR.

Offline john e. holliday

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Re: PDK Mockingbird SSR kit update
« Reply #11 on: July 13, 2017, 01:07:46 PM »
Looks great.  Hope she does well for you. H^^
I was always taught to respect my elders, but it keeps getting harder to find one.
Today I broke my personal record for most consecutive days lived.
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Offline Motorman

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Re: PDK Mockingbird SSR kit update
« Reply #12 on: July 14, 2017, 02:08:59 PM »
I like the bird and the purple colors. How did the weight come out?
There will be a sunny day and we will fly our airplanes.

Offline bill bischoff

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Re: PDK Mockingbird SSR kit update
« Reply #13 on: July 23, 2017, 05:40:10 PM »
26 oz as SSR, 29 oz as AMA SR. 1st in SSR, 2nd in AMA SR at the NATS. Plane flew well, everything worked "right off the board" as they say.

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Offline Motorman

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Re: PDK Mockingbird SSR kit update
« Reply #14 on: July 23, 2017, 10:16:31 PM »
What were your lap times with the Webra?


Thanks,
MM
There will be a sunny day and we will fly our airplanes.

Offline bill bischoff

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Re: PDK Mockingbird SSR kit update
« Reply #15 on: July 23, 2017, 10:40:44 PM »
.340 venturi, 4mm spraybar through the center, box-stock, one tank ground run before flying, maybe 6 tanks flown before racing. Only tried two props so far. High 17's. Steady running, good starting. Lots more potential to be extracted. Just wanted to get it working first.

Offline bill bischoff

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Re: PDK Mockingbird SSR kit update
« Reply #16 on: August 04, 2017, 10:32:28 PM »
The kit is now on the web page. pdkllc.com  (051)


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