Re: Prop Hub

Tom Mueller · Post by **Tom Mueller** » Sun Aug 13, 2006 11:26 am

'I've recently had the prop off for inspection. This was due to a
slight vibration felt in the 1500 rpm range. The prop did check out ok
balance wise, and I'm suspecting one of the eight flange nuts had been
improperly torque. The question I have, I see no front cone for this
hub set up. This is off a 200hp ranger with wood prop. When I took it
off I found one spacer at the rear, one cone, the hub flange section
with long portion facing forward, then the large prop nut holding the
whole thing together. The manual indicate I should have a cone on the
front side also. Anybody...thanks
Tom
Hanford,Ca'

cgalley · Post by **cgalley** » Sun Aug 13, 2006 11:56 am

'Why not follow the manual?

----- Original Message -----
From: Tom Mueller
To: fairchildclub@yahoogroups.com
Sent: Sunday, August 13, 2006 12:25 PM
Subject: [fairchildclub] Prop Hub

I've recently had the prop off for inspection. This was due to a
slight vibration felt in the 1500 rpm range. The prop did check out ok
balance wise, and I'm suspecting one of the eight flange nuts had been
improperly torque. The question I have, I see no front cone for this
hub set up. This is off a 200hp ranger with wood prop. When I took it
off I found one spacer at the rear, one cone, the hub flange section
with long portion facing forward, then the large prop nut holding the
whole thing together. The manual indicate I should have a cone on the
front side also. Anybody...thanks
Tom
Hanford,Ca

[Non-text portions of this message have been removed]

'

Buell Powell · Post by **Buell Powell** » Sun Aug 13, 2006 2:00 pm

'Hi Tom,
There is a flange pressed in both the front and rear of the Hub.
I think you need part no. AN5007-20. The hub I have is from a PT19 that had
the original wood prop. I have not used it yet and can e-mail you a picture
if you think it would help-just send your e-mail address to
bhpowell@gvtc.com.
Buell Powell

----- Original Message -----
From: "Tom Mueller"
To:
Sent: Sunday, August 13, 2006 12:25 PM
Subject: [fairchildclub] Prop Hub

> I've recently had the prop off for inspection. This was due to a
> slight vibration felt in the 1500 rpm range. The prop did check out ok
> balance wise, and I'm suspecting one of the eight flange nuts had been
> improperly torque. The question I have, I see no front cone for this
> hub set up. This is off a 200hp ranger with wood prop. When I took it
> off I found one spacer at the rear, one cone, the hub flange section
> with long portion facing forward, then the large prop nut holding the
> whole thing together. The manual indicate I should have a cone on the
> front side also. Anybody...thanks
> Tom
> Hanford,Ca
>
>
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>

'

Tom Mueller · Post by **Tom Mueller** » Sun Aug 13, 2006 3:11 pm

'Buell,
I would like to have photos. Thanks, Now I've looked real hard at the
schematic on page 74 of the Airplane parts catalog Army models UC-61A
and UC-61K, I think they're describing the hub for Scarab motor. If I
am to believe this drawing,, that it's for the Ranger motor also, I'm
not only missing a front cone, the hubs on backwards. Warner # 8599
is stamped on back . Lost!
Tom
Tommuell@earthlink.net'

cgalley · Post by **cgalley** » Sun Aug 13, 2006 3:17 pm

'Did you check the tracking of the prop before you removed the it?

You need to check the tracking when you re-install, regardless of the parts you use.

Cy Galley - Chair,
AirVenture Emergency Aircraft Repair
A 45 Year Service Project of Chapter 75
EAA Safety Programs Editor - TC
EAA Sport Pilot

----- Original Message -----
From: Tom Mueller
To: fairchildclub@yahoogroups.com
Sent: Sunday, August 13, 2006 4:11 PM
Subject: [fairchildclub] Re: Prop Hub

Buell,
I would like to have photos. Thanks, Now I've looked real hard at the
schematic on page 74 of the Airplane parts catalog Army models UC-61A
and UC-61K, I think they're describing the hub for Scarab motor. If I
am to believe this drawing,, that it's for the Ranger motor also, I'm
not only missing a front cone, the hubs on backwards. Warner # 8599
is stamped on back . Lost!
Tom
Tommuell@earthlink.net

[Non-text portions of this message have been removed]

'

Tom Mueller · Post by **Tom Mueller** » Sun Aug 13, 2006 3:49 pm

'Cy,
I did check tracking a couple of months age. Seemed ok,but thinking
back on it I could have spent more time with it. I saw a mechanic use
a tape measure one time, guess I picked up a bad habit. The shake was
bad enough I had my "supervising mechanic" do a check with a
electronic device mounted near the prop. He said the vibration was
unacceptable. The wood prop has since checked out just fine. I've got
a hub problem here, or maybe the way it was mounted. Found a lot of
heavy grease had been used in the mounting, that's supposed to be a no-
no.
Tom'

little_restorer · Post by **little_restorer** » Sun Aug 13, 2006 4:42 pm

'--- In fairchildclub@yahoogroups.com, "Tom Mueller"
wrote:

>
> I've recently had the prop off for inspection. This was due to a
> slight vibration felt in the 1500 rpm range. The prop did check

out ok

> balance wise, and I'm suspecting one of the eight flange nuts had

been

> improperly torque. The question I have, I see no front cone for

this

> hub set up. This is off a 200hp ranger with wood prop. When I took

it

> off I found one spacer at the rear, one cone, the hub flange

section

> with long portion facing forward, then the large prop nut holding

the

> whole thing together. The manual indicate I should have a cone on

the

> front side also. Anybody...thanks
> Tom
> Hanford,Ca
>ok,before to do more investigations,the first step is this:your

engine is absolutely ok?Do you know if all cylinders are working
well?specifically to measure compression leakage.or if the engine
was reassembled with desbalanced part.

second:the prop was stored in the right way?horizontally all
time.and when is in not flying in a dry place or covered.'

bty697859 · Post by **bty697859** » Sun Aug 13, 2006 5:06 pm

'hi guys , just to throw somthing in the pot,
if when you were running your plane up and you had a cross wind or a
side wind you will notice a vibration, ive noticed it alot with my
200hp ranger engined f24 , you can hear it as well. especially at
the rpm your talking about. hope im wrong but thought i would add my
bit and if it wasnt there before why would your vibration magicly
apear?
sorry but i am under qualified to give you a tec answer, just
somthing ive noticed.
Best regards to you all G-RGUS n Janes

--- In fairchildclub@yahoogroups.com, "little_restorer"
wrote:

>
> --- In fairchildclub@yahoogroups.com, "Tom Mueller"
> wrote:
> >
> > I've recently had the prop off for inspection. This was due to a
> > slight vibration felt in the 1500 rpm range. The prop did check
> out ok
> > balance wise, and I'm suspecting one of the eight flange nuts

had

> been
> > improperly torque. The question I have, I see no front cone for
> this
> > hub set up. This is off a 200hp ranger with wood prop. When I

took

> it
> > off I found one spacer at the rear, one cone, the hub flange
> section
> > with long portion facing forward, then the large prop nut

holding

> the
> > whole thing together. The manual indicate I should have a cone

on

> the
> > front side also. Anybody...thanks
> > Tom
> > Hanford,Ca
> >ok,before to do more investigations,the first step is this:your
> engine is absolutely ok?Do you know if all cylinders are working
> well?specifically to measure compression leakage.or if the engine
> was reassembled with desbalanced part.
>
> second:the prop was stored in the right way?horizontally all
> time.and when is in not flying in a dry place or covered.
>

'

Tom Mueller · Post by **Tom Mueller** » Sun Aug 13, 2006 5:50 pm

'Thanks for the input fellow fliers, All I can say, I've got less that
6 hrs in this monster and just finished my tail dragger
instruction . if I hadn't been so consumed with thoughts of crashing
and burning my much loved sixty year old Fairchild ,not to mention
the hair raising 3 point landing training,
I probably would have noticed something like a little prop shake.
Anyway, it definitely is a prop hub problem. I can tell from
the "work marks" on the inside of wood hub. Something just not lining
up.

BUELL, thanks for the photos. There was an identical unit on ebay
about a week ago, it didn't sell. Supposedly new old stock.
Tom'

Bob Haas · Post by **Bob Haas** » Sun Aug 13, 2006 6:26 pm

'As I recall there are three prop hubs that fit the Ranger
shaft. They all have detachable cones, they all have

Inner and outer flanges and have the nine grooves with a blank as the shaft
has. There are two different prop bolt mounting

diameters You must identify. the hub you have and check the sequence of
cones and flanges as well as the direction of thrust..

Bob Haas.

_____

From: fairchildclub@yahoogroups.com [mailto:fairchildclub@yahoogroups.com]
On Behalf Of cgalley
Sent: Sunday, August 13, 2006 1:55 PM
To: fairchildclub@yahoogroups.com
Subject: Re: [fairchildclub] Prop Hub

Why not follow the manual?

----- Original Message -----
From: Tom Mueller
To: fairchildclub@ yahoogroups.com
Sent: Sunday, August 13, 2006 12:25 PM
Subject: [fairchildclub] Prop Hub

I've recently had the prop off for inspection. This was due to a
slight vibration felt in the 1500 rpm range. The prop did check out ok
balance wise, and I'm suspecting one of the eight flange nuts had been
improperly torque. The question I have, I see no front cone for this
hub set up. This is off a 200hp ranger with wood prop. When I took it
off I found one spacer at the rear, one cone, the hub flange section
with long portion facing forward, then the large prop nut holding the
whole thing together. The manual indicate I should have a cone on the
front side also. Anybody...thanks
Tom
Hanford,Ca

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]

'