KR> Reading related to Cranks and flywheels

2011-12-29 Thread Charles Smiith 
Seems to me that all of the ?solutions? just transfers the problem away from 
the crankshaft, dosen?t make it go away.  Whatever the propeller is connected 
to just has to be strong enough to never break. So the ultimate solution seems 
to be a stronger crankshaft to withstand the propeller vibrations.  Can the 
Corvair crankcase bearing be bored out for a bigger journal?  And can the 
crankshaft be modified to a larger  journal?   I know they can rebuild them by 
building up the journal with an electric welder and regrinding it.

KR> Reading related to Cranks and flywheels

2011-12-28 Thread Vaughan Thomas 
Spose its too common sense for most but  'if its not broken dont fix it" 
thinking applies in a lot of cases!  flywheels are needed (as are harmonic 
balancers). The suggestion from Phil re belted reduction drives is partly 
correct as to allowing engines to produce the designed rpm/power, but belted 
reductions impose side thrust on the rear main bearing. Neil Hintz 
(www.autoflight.co.nz) produces a PSRU that uses a flexible coupling to 
isolate the engine fom the reduction gears which seems to be a sound 
engineering approach. (the PSRU would provide some measure of flywheel 
inertia effect I would think). Just more fuel for the fire of debate! 
Vaughan Thomas
Hamilton New Zealand
- Original Message - 
From: "Glenn Martin" <rep...@martekmississippi.com>
To: "KRnet" <kr...@mylist.net>
Sent: Wednesday, December 28, 2011 9:24 AM
Subject: KR> Reading related to Cranks and flywheels


Might be helpful:

http://www.flat6innovations.com/broken-crank
-- 
Glenn Martin,
KR2 N1333A,
Biloxi, MS

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KR> Reading related to Cranks and flywheels

2011-12-27 Thread Tony King 
Running a type 4 VW with a direct drive prop at the 'right' end (from a car
perspective) is considered by many (and proven by some) to be a recipe for
disaster, however that's considered the correct end for a PSRU.  So to
answer the question, the aircraft equivalent of the auto transmission (in
terms of its effect on dampening pulses) probably is the PSRU.

Cheers,

Tony King
Queensland Australia


On 28 December 2011 06:48, Barrett <barret...@comcast.net> wrote:

> Good article. The L-98 Corvette engine (and LT-1) when coupled to the
> 6-speed tranny also use a dual mass flywheel, for exactly that same reason.
> When switched to an aluminum flywheel- same results. Another thing too-
> when
> the clutch disc with spring dampeners are changed to one without the
> springs, same thing happens, just takes a bit longer. The Corvettes with
> auto tranny's don't have this problem as the transmission acts as the
> buffer
> (shock & harmonics absorber).
> In our case, I'm sure the problem can be fixed by finding and fixing the
> dynamics of the problem rather than the use of just brute strength (heavier
> crankshaft).
>
> With all else being equal, do planes with constant speed props have the
> same
> problem?
> (grasping at straws here- what would our equivalence be to the auto tranny
> vs. manual gearbox)
> Rubber mounted prop huh??
> Self balancing prop huh??
> More mass in the prop hub??
> 2-blade vs. 3-blade prop??
>
> -Barrett
>
> -Original Message-
> From: krnet-boun...@mylist.net [mailto:krnet-boun...@mylist.net] On Behalf
> Of Glenn Martin
> Sent: Tuesday, December 27, 2011 1:25 PM
> To: KRnet
> Subject: KR> Reading related to Cranks and flywheels
>
> Might be helpful:
>
> http://www.flat6innovations.com/broken-crank
> --
> Glenn Martin,
> KR2 N1333A,
> Biloxi, MS
>
> ___
> Search the KRnet Archives at http://www.maddyhome.com/krsrch/index.jsp
> to UNsubscribe from KRnet, send a message to krnet-le...@mylist.net
> please see other KRnet info at http://www.krnet.org/info.html
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>
> ___
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>

KR> Reading related to Cranks and flywheels

2011-12-27 Thread Glenn Martin 
Might be helpful:

http://www.flat6innovations.com/broken-crank
-- 
Glenn Martin,
KR2 N1333A,
Biloxi, MS