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Author Topic: C-65 Prop hub lost in flight  (Read 723 times)
N5618Z
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A/C: 1940 J3F-65
City: Acworth
State: Georgia
Posts: 16
« on: 07/29/10, 09:51 AM »
Has anyone ever heard of a C-65 prop hub being lost in flight?
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bob turner
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SILVER DONOR
« Reply #1 on: 07/29/10, 01:59 PM »
I have had three of them crack - just seems to make more noise, and when you check it it will not tighten.  Cracking may be due to under or over tightening, but more likely it is a defect in the design.
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Jackson
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A/C: 1946 J3, C85-12
City: Long Beach
State: California
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« Reply #2 on: 07/29/10, 03:36 PM »
220 Foot Pounds, no more or it will crack.
Continental has a SB out on this problem
Jackson
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Jorgen
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City: Lund, Sweden
State: Sweden, Europe
Posts: 202
« Reply #3 on: 07/29/10, 04:55 PM »
Quote from: N5618Z on 07/29/10, 09:51 AM
Has anyone ever heard of a C-65 prop hub being lost in flight?

Does it count to loose a skull cap spinner?

Just (L-)4 fun/ Jörgen
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1944 Piper L-4H, shipped to UK july 1944, now dressed as a J-3. Sold as war surplus to Sweden after WW2. Has a 1944 A-65, but not the original one, so it must have seen some action...
Bunkerhill
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« Reply #4 on: 07/29/10, 05:18 PM »
Quote from: Jorgen on 07/29/10, 04:55 PM
Quote from: N5618Z on 07/29/10, 09:51 AM
Has anyone ever heard of a C-65 prop hub being lost in flight?

Does it count to loose a skull cap spinner?

Just (L-)4 fun/ Jörgen
                          How about a Scott Tailwheel Hubcap   Relpacement cost 100.00   Cry Cry Cry
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Lee S Simmons -son of Roy L. Simmons, B-24 squad leader Pacific
Corky Carson
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« Reply #5 on: 07/29/10, 09:01 PM »
220 foot lbs sounds like a lot!
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Charlotte NC
1945 J-3 N1129V
jimmy
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A/C: 1947 J3Cub I rebuilt it in 94. Flying and maintaining ever since.
City: dallas
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« Reply #6 on: 07/29/10, 10:54 PM »
      I had a prop loosen up after a hundred seventy or so hours. Several nuts loosened. The nuts were safety wired in a circle. After the retorque, I used cotter pins, a better system.  At cruise power, 2150, there was a noticable slight vibration, but throttled back to 1600 there was an unmistakabe shake. After landing and a walk around, the prop was the first thing I touched; ;you could feel it was loose.     jimmy
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bob turner
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« Reply #7 on: 07/29/10, 11:28 PM »
Wood prop?
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Jackson
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A/C: 1946 J3, C85-12
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« Reply #8 on: 07/30/10, 01:43 AM »
Directions for installing and removing Propeller and Propeller Hub from a Tapershaft Engine.
Jackson
« Last Edit: 07/30/10, 01:46 AM by Jackson » Logged
Jorgen
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City: Lund, Sweden
State: Sweden, Europe
Posts: 202
« Reply #9 on: 08/02/10, 05:00 PM »
Quote from: Bunkerhill on 07/29/10, 05:18 PM
Quote from: Jorgen on 07/29/10, 04:55 PM
Quote from: N5618Z on 07/29/10, 09:51 AM
Has anyone ever heard of a C-65 prop hub being lost in flight?

Does it count to loose a skull cap spinner?

Just (L-)4 fun/ Jörgen
                         How about a Scott Tailwheel Hubcap   Relpacement cost 100.00   Cry Cry Cry
I actually found  my spinner. Wasn't much good though, but at least it hadn't hit someone Roll Eyes

Just (L-)4 fun/ Jörgen
« Last Edit: 08/02/10, 05:03 PM by Jorgen » Logged
1944 Piper L-4H, shipped to UK july 1944, now dressed as a J-3. Sold as war surplus to Sweden after WW2. Has a 1944 A-65, but not the original one, so it must have seen some action...
glennj3
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A/C: 1940 J3L
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« Reply #10 on: 08/03/10, 12:56 AM »
I have never heard of losing a skull cap ! Did the screw come out or break and was it on strait (the mount even)?

GG
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Retired USAFR, Active RN, Family Man.
Jorgen
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City: Lund, Sweden
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« Reply #11 on: 08/03/10, 02:49 AM »
Hi Glenn,
I think the screw came out of the nut plate. It was loose, I thought I had fixed it by bending/re-tensioning the nutplate but evidently that was not a good fix.

The Luscombe community seems serious about their SkullCaps:
http://luscombe.org/index.php?page=skull-cap-spinner

Just (L-)4 fun/ Jörgen
« Last Edit: 08/03/10, 02:57 AM by Jorgen » Logged
1944 Piper L-4H, shipped to UK july 1944, now dressed as a J-3. Sold as war surplus to Sweden after WW2. Has a 1944 A-65, but not the original one, so it must have seen some action...
J5man
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« Reply #12 on: 08/03/10, 06:40 AM »
Jorgen,

Good advice indeed. I installed a skull cap on the bipe(experimental) and was provided a steel bracket with slip-on Timmermann PK plate. I can see where the fine thread screw/slip-on plate would be better. And FAA approved too.

We must be carefull buying stuff for certified aircraft. Many vendors are selling to the experimental market a product that "looks" just like an approved item, and cheaper too.

They will likely work ok if carefully installed but if anything happens, even an incident not related to the non FAA/PMA item, we would be unhappy with our decision to no use care in our purchase(or being cheap)....

Jack
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D18GE
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A/C: Legend Cub N77355 s/n 1003
City: Brookhaven
State: NY
Posts: 212
« Reply #13 on: 08/03/10, 09:13 AM »
One day a neighbor who knows I fly called and said "A piece of an airplane fell in my yard and landed 2 feet from where I was standing." I said "really?" I went over to look feeling sure it was some thing else. It turned out to be a skull cap spinner. I took it and went to the airport and found the C140 it came from. It had a Tinnerman nut on the brackett.
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Rich Giannotti
CFI-A, CFI-I
Legend Cub AL3 N77355
Previously owned 1946 J3C N92395
Brittle
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A/C: 1941 J3C-65
City: Acworth
State: Georgia
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« Reply #14 on: 08/05/10, 08:29 AM »
Yes
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