An228 & AN229

[TimHicks]

Re: An228 & AN229

The funny thing is that when I go to the website of Ralmark (whose name is stamped on the new pulleys that I bought from Doug Combs), the only 3" pulley that they have has a 2.500" groove diameter. That's the same as my old pulley. Not the new one.

http://www.ralmark.com/ms20220.html

Now these production pulleys have a lot of other dimensions that are different. So there is no way that they would work on a TCraft. But it reinforces my opinion that the old pulleys are pretty standard.

Does anyone know of a source for standard bushed pulleys (instead of these fancy ball-bearing pulleys from Doug)?
I'd like to find the groove diameter.

The theoretical difference in cable length needed to use the new pulleys is 0.43" for every 90° of cable wrapped around the pulley. So if I have a 180° turn, I'd have to lengthen the turnbuckle .86" or about 7/8".

[Mark Julicher]

Re: An228 & AN229

Consider switching the turnbuckle eyes to the long variety. Then you could have full engagement of the turnbuckle threads and the new pulleys to boot!

[Hal]

Re: An228 & AN229

Does anyone know what quantity of the two sizes of pulleys are needed to do a complete retrofit of a BC12D?
Thanks,
Hal

[TimHicks]

Re: An228 & AN229

I just counted the 3" pulleys in my airplane the other day. I counted 10 total in my '46 BC-12. I also remember someone mentioning 7 of the smaller ones. But I haven't actually counted those myself.

[GallagerG]

Re: An228 & AN229

My question has nothing to do with pulleys, but deals with exhaust possibilities for my F 21 B. This is my first time on the site and I haven't figured out how to start a new thread. Anyway, I have an '87 F21 B, and the exhaust is cracked, been welded, and cracked and eroded some more, and I am looking for ideas on repair or replacement. Any ideas on where to start, approvals, etc. without breaking the bank, are appreciated.

Thanks

[TimHicks]

Re: An228 & AN229

Gallager,
Welcome to the tribe. First, you should go near the top of this page, a little right of center is a "Search" tab. Try searching first, because your exhaust question may have been discussed already.
If you want to start a new thread, go to the very top left and click on "Taylorcraft Foundation Discussion Forums". Once you're on that main page, click on a Forum, let's say "Everyday Taylorcraft Discussion".

Once you're on the forum page, go to the bottom left and look for the "New Thread" button.

Good luck
Tim

[TimHicks]

Re: An228 & AN229

Tribe,
I'm still trying to get my TCraft back together after annual, including having replaced two pulleys in the elevator control system.
The difference in pulley diameter between the old and new meant that I needed to make the cables longer.
The turnbuckles didn't have enough adjustment to make a difference, so my IA made a new link between the turnbuckle and the elevator horn out of 4130.
Now it's finally getting back together, and my IA wants to know the correct cable tension for the elevator cable. I searched the forum and only found some anecdotal info for aileron cables. Any suggestions on elevator cables?

Tim

[Forrest Barber]

Re: An228 & AN229

They did not use cable tension at the factory. We adjusted the cables to get the correct up and down from the TC sheet, then tightened each the same amount ; perhaps 1/2 turns till they were snug and with a properly lubed system the elevator would free fall from the neutral poisition with the tail up in level flight. Pull the wheel clear back and secure with seat belt then go to the rear and the elevator should stay against the stop even if you apply moderate pressure to the end of the elevator. Perhaps compare it to a properly rigged Cessna 150?

[TimHicks]

Re: An228 & AN229

Great stuff. Thanks Forrest.

[Forrest Barber]

Re: An228 & AN229

Back then , things were done by "feel". I do have a tension-o-meter pehaps on a 59 degree day I will use it on my New TAylorcraft and save the results. We do all this at the Fly-In , perhaps these REgional Fly-Ins can have a maintenance walk-around .

[OldBits2]

Re: An228 & AN229

For those interested in this subject and proper sizing / dimensions:

Our FAA PMA was established by reviewing the ORIGINAL taylorcraft drawings for #228 and #229 commercial pulleys (we have those drawings). We did a 100% dimensional equivalency work-up and proof for the FAA between those and the old pulleys as defined on the drawing.

Those were compared with later re-designs of those pulleys using the ball bearing inserts as they were installed by Taylorcraft in the F-19, and sold as replacement pulleys by two Taylorcraft organizations.

Thus we have a very HIGH level of confidence that our product is properly designed to the latest and most considered Taylorcraft designs (such as they were).

We would note that the original pulleys were a commercial design specification, and the internal diameter could have had a large variance within that 'specification', or the manufacturer(s) might have changed the commercial specification without Taylorcraft's knowledge.