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Mark,
What about getting a non-drilled output shaft from Tracy
and have it locally fitted to match the MT flange?
Bobby Hughes
Yes, it’s a stepped
hole. There is a ¾ counterbore on the mating side which is 3/32” deep. The
remainder is 5/8”.
Mark
S.
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Tracy Crook
Sent: Wednesday, December 15, 2004 12:36
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: M/T Prop Won't Fit
PSRU
Can do, but the
one-of-a-kind shaft price from the CNC facility that does this part is high
(> $500). There are better ways to do this. BTW, is the drive lug
called for by MT really 5/8"? That’s not what I remembered from past
discussions. If it really is, my last suggestion would be the
easiest answer. Cost is almost zero.
----- Original
Message -----
Sent: Wednesday, December
15, 2004 1:28 PM
Subject: [FlyRotary] Re: M/T
Prop Won't Fit PSRU
Tracy,
I do have access (if
$ufficiently bribed) to an experienced machinist, with a Bridgeport that should be
able to handle the job. What’s the chance of getting an output shaft
pre-drilled with ¾” bushing holes?
Mark
S.
(lawn ornament
comment referred to the M/T prop.)
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Tracy Crook
Sent: Wednesday, December 15, 2004 12:16
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: M/T Prop Won't
Fit PSRU
I have no
objection to removing the 5/8" drive lugs and drilling out the prop flange
hole for 3/4" bushings. I'm just saying it probably can't be done with a
hand drill in the garage. Any good machine shop would be able to do
this with the required precision.
Tracy (cringing
at the thought of RD-1C lawn ornaments)
----- Original
Message -----
Sent: Wednesday,
December 15, 2004 12:37 PM
Subject: [FlyRotary] M/T
Prop Won't Fit PSRU
I have been
working to resolve a problem for more than a month now and thought I would
query the group for a possible solution.
If anyone else is
running (or planning to run) a 3-blade M/T electric prop with the RD-2C
gearbox, I have discovered a mating problem in using this prop/gearbox
combination for my 20B. The problem is the RD-2C prop flange comes
with 3/8 id x 5/8 od bushings. The M/T prop has a stepped hole that is
¾” for the first 3/32” and then goes to 5/8”. Tracy is not
comfortable with drilling out the 5/8” bushings and M/T adamantly advises
against using anything less than ½” prop bolts with this prop. So, I’m
at a standstill until I can get this resolved. The only solution I can
see is to press out the existing bushings and open up the holes to accept ¾”
od x ½” id bushings. But that would require disassembly of the gearbox
and some precision machine work, possible but not my first choice.
Mark
S.
Lancair ES –
20B
(with a very
pricey lawn ornament)
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