propeller hubs and tapered crankshafts

[OldBits2]

I wanted to let folks know that we are taking deposits on the Continental taper shaft propeller hubs used for the 65, 75, 80, 85 HP engines Continental Motors PN 3745. If you need one of these, or know someone who needs one, please call to reserve yours. We are collecting deposits and customer information. These are being produced to an FAA-PMA drawing set and to approved tolerances to be released under CFR 14, part 21.

We presently have three folks who have reserved the items, and we are seeking 4 more who might need these for their airplanes or air boats. Cost will be modest, and quality is very high.

Please let other lists and your friends with vintage equipment know to contact [email protected], or 480-650-0883, or 480-917-0969, before May 15 to make a reservation.

Most Sincerely, Doug Combs

[Jim Herpst]

Re: propeller hubs and tapered crankshafts

I know that seems like a bunch of money to some on this site.Actually they sent me a brand new one back in 2000 or abouts and it was the same price then . Very pleased with the part and glad to get it as my Taylorcraft was at a remote airport due to the wood prop working loose and trashing the old hub. Thank you for remaking these. That is an important part that is much needed. Many old ones out there(actually NOT that many) . Those that are loose or even on plane ALL should be looked at by a shop to yellow tag em at OH time in MYHO.

[barnstmr]

Re: propeller hubs and tapered crankshafts

What's the price? Am I missing something?

[Guest]

Re: propeller hubs and tapered crankshafts

I wanted to let folks know that we are taking deposits on the Continental taper shaft propeller hubs used for the 65, 75, 80, 85 HP engines Continental Motors PN 3745. If you need one of these, or know someone who needs one, please call to reserve yours. We are collecting deposits and customer information. These are being produced to an FAA-PMA drawing set and to approved tolerances to be released under CFR 14, part 21.

We presently have three folks who have reserved the items, and we are seeking 4 more who might need these for their airplanes or air boats. Cost will be modest, and quality is very high.

Please let other lists and your friends with vintage equipment know to contact [email protected], or 480-650-0883, or 480-917-0969, before May 15 to make a reservation.

Most Sincerely, Doug Combs

Will these parts come with a valid FAA/PMA tag and approval?

Dave

[Jim Herpst]

Re: propeller hubs and tapered crankshafts

Sorry. I saw the Price on Barnstormers not the announcement placed here Terry. They were around 899. Cheap considering the magnitude of what they do , They are obsolete. Read the announcement ...the approval is in it. I am not their spokes person just a past satisfied customer. They are doing a lot out there that no one else is willing to take on. I wish he did more for the Taylorcraft...he is primarily Luscombe support.....

[Guest]

Re: propeller hubs and tapered crankshafts

Did anyone check to see if Fresno Airparts has them? They used to have some NOS.

I have a NOS Continental one I bought around 1987, will be interesting to see what my executer gets for that.

So Jim you are sure that they come with an FAA/PMA tag? The reason I asked above was that he used too many words to simply say that it comes with an FAA/PMA tag so it made me wonder.

[Laz]

Re: propeller hubs and tapered crankshafts

Fresno no longer has NOS. I just had mine checked for cracks and re-plated. That will run you around a 100 bucks.

Fresno does have some that are used and yellow tagged. They are around 400 bucks. d

My hat is off to whoever is willing to make new PMA parts. Even if you find a good used one they do seem to develop cracks over time.

[magman]

Re: propeller hubs and tapered crankshafts

Didn't the originals come from the factory with cracks?

Most of them I look at are defective.

That wouldn't be due to rust & some of the removal methods used, would it?

[Jim Herpst]

Re: propeller hubs and tapered crankshafts

Wow crazy if they came from the factory with cracks or for that matter there are that many bad ones out there.. That gives me the creeps .Ought to ground the fleet that has old ones on them. Drude I read the same thing you do. I am not assuming they come tagged with the wording they have on that. Suggest anyone needing one to check out the wording above on Dougs announcement. I believe mine (purchased brand new from them over 11 years ago was Tagged as PMA D. Some one please call them that needs one. I am not in need of one now than heavens.

[Guest]

Re: propeller hubs and tapered crankshafts

I suspect that the cracks are due to overtightening. I have an old Aeronca insruction (service helps and hints #14). It makes more sense to me than hundreds of pound feet. It is a tiny bit bigger (about 70Kb too big) than the .pdf file limit so I can't attach it.

[N-43121]

Re: propeller hubs and tapered crankshafts

Here is a link to the Aeronca instruction that Dave mentions above. I used this technique recently and it seems like a very practical and common sense approach. It is the way I plan to remove and install hubs in the future.

http://www.aeronca.com/docs/HelpsAndHints/14/21-Feb-1961/SHH_14_Champion_21-Feb-1961.pdf

Rod

[rammon3]

Re: propeller hubs and tapered crankshafts

There is an excellent article about this at the Cub Club website. I made a set of the special tools shown in the article and it made hub removal a piece of cake.

[Guest]

Re: propeller hubs and tapered crankshafts

There is an excellent article about this at the Cub Club website. I made a set of the special tools shown in the article and it made hub removal a piece of cake.

I think that may be the article that lists a very high torque at installation.

I don't like that part.

I suspect the high torque is the cause of the hub cracks.

There is no need for high torque on a keyed tapered shaft.

If you make the torque too high on the nut then you merely put excess hoop stresses on the hub and likely cause a crack at the sharp corner of the keyway (Which is what we see).

The Aeronca installation method is pretty docile, I have used it for 29 years, no cracks yet. I am pretty sure that many years ago the same method had been on a Continental service letter too.

Dave