Need Set of Tcraft BC 12 D Pedals

[swift1b]

I need a set of the original TCraft pedals if anyone has any to sell.

thanks bob

[Hank Jarrett]

Brake or rudder?

[swift1b]

Brake.. I am working with a DER to get FAA approval for hyd brake conversion that may benefit a lot of BC12D owners. I am setting up a model to determine the pressures produce using Cleveland Brake cylinders activated by the original pedals.. The question: is he leverage of the original pedals enough to activate the brakes.

[astjp2]

Yep way more force than what toe brakes can provide.

[Hank Jarrett]

Have you considered MAKING new pedals? You could make a couple of simple improvements to the design like increasing the size of he foot pad a bit and making the vertical arm longer below if you are attaching the master there or deeper if you are attaching it behind the pedal. I have done some engineering on control force analysis and would enjoy working some if the engineering if you are interested. I also have a restored fuselage (un covered) with dual factory brakes that aren't in yet. It would be perfect for testing your concepts.

Hank


Winchester (KOKV) is only 165 NM from KSFQ!

[astjp2]

Don't over think this. You can google the forces for using your heels, its something like 200# or more, toe pressure is less than heel pressure. The master vs caliper size is also important, you don't need dual puck brakes on a Taylorcraft, even with 31" wheels. Dual pucks are a good way to flip an airplane on its back.

If it was me, I would mount the master cylinders on the through holes of the gear where the mechanical brake bellcrank is mounted. Use a 3/16" pin and a spacer to take up the slack on the lower mount, use an AN111 cable bushing for the upper part of the master cylinder, run the cable to the pedals, mount the reservoir on the gear leg with a strap or directly to the master via a 1/8" nipple, a short hose to the calipers and done.

[PA1195]

Good idea Tim about the lower gear leg pull cylinders (http://www.groveaircraft.com/mcpull.html) and using cable that's already available. How about a fluid feed reservoir on the firewall with split feed lines from a bulkhead fitting on the boot cowl? I'd also want to protect the master's extension rod from debris with a flexible rubber cover like shock absorbers use. Reservoirs often have a drilled 1/8" NPT vent plug that can be exposed to the elements.

Rubber protection bellows example below.

Gary

[astjp2]

https://www.aircraftspruce.com/catal...?clickkey=8214

Just screw it into the master...and use covered gear

[Jim Herpst]

If you had original Shinn Brakes don't throw the parts away. Many here still use them and are happy with them.

[swift1b]

Does anyone have a source for a drawing of the original pedals?

[Hank Jarrett]

They are cast aluminum. I haven't seen any drawings of them but if you are going to try to "make" some an accurate sketch would probably work.

[PA1195]

If a tree falls near Forrest does he hear? Sorry for that analogy but after all his years what will outlive him?

Edit: If anyone has prints of the pedals it's likely Forrest Barber @ http://www.barberaircraft.com

Gary

[Hank Jarrett]

I seriously don't think anyone will have drawings. We will have to make some.

[Hank Jarrett]

And Forrest has been around running engines all his life. I kind of doubt he hears a lot, but he is pretty good at reading lips!

[PA1195]

Maybe do a 3D scan of a pedal at a shop that does that. Tim would know. Maybe water cut from a block to make one.