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Speed,Combat,Scale,Racing => Rat Racing and Team Racing => Topic started by: bill bischoff on May 03, 2017, 08:52:03 PM

Title: PDK Mockingbird SSR kit update
Post by: bill bischoff 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.
Title: Re: PDK Mockingbird SSR kit update
Post by: BillLee 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.
Title: Re: PDK Mockingbird SSR kit update
Post by: bill bischoff 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
Title: Re: PDK Mockingbird SSR kit update
Post by: Air Ministry . 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
Title: Re: PDK Mockingbird SSR kit update
Post by: bill bischoff 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
Title: Re: PDK Mockingbird SSR kit update
Post by: bill bischoff 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.
Title: Re: PDK Mockingbird SSR kit update
Post by: bill bischoff 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.
Title: Re: PDK Mockingbird SSR kit update
Post by: Lyle Spiegel on June 28, 2017, 02:43:20 AM
what do you use for BC? Looking for BC to use in Perky. Thx
Title: Re: PDK Mockingbird SSR kit update
Post by: bill bischoff 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.  ???
Title: Re: PDK Mockingbird SSR kit update
Post by: bill bischoff 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.
Title: Re: PDK Mockingbird SSR kit update
Post by: john e. holliday on July 13, 2017, 01:07:46 PM
Looks great.  Hope she does well for you. H^^
Title: Re: PDK Mockingbird SSR kit update
Post by: Motorman on July 14, 2017, 02:08:59 PM
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Title: Re: PDK Mockingbird SSR kit update
Post by: bill bischoff 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.

BB
Title: Re: PDK Mockingbird SSR kit update
Post by: bill bischoff 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.
Title: Re: PDK Mockingbird SSR kit update
Post by: bill bischoff on August 04, 2017, 10:32:28 PM
The kit is now on the web page. pdkllc.com  (051)