I,m watching the discussion re corvair engine & broken crankshafts with interest. (I'd like to get a couple of suitable engines having purchased WW's conversion manual - but the engines dont exist down here in NZ). It seems Glen martin might be ontoit as to the flywheel thing, can a prop achieve the power impulse dampening effect like a flywheel, especially on an engine intended to run a flywheel or torque converter ? do 3 bladed props give a better absorption effect? Has there been significantly more broken cranks on 2 or 3 blade propped engines?? Perhaps saving some weight but gaining a safety margin isnt such a bad idea? What does the guru WW think about the broken crank scenario? any comments? Vaughan Thomas Hamilton. New Zealand ----- Original Message ----- From: "Glenn Martin" <rep...@martekmississippi.com> To: "KRnet" <kr...@mylist.net> Sent: Tuesday, December 27, 2011 9:24 PM Subject: KR> Fwd: Cranks and flywheels
-------- Original Message -------- Subject: Cranks and flywheels List-Post: krnet@list.krnet.org Date: Tue, 27 Dec 2011 02:16:14 -0600 From: Glenn Martin <rep...@martekmississippi.com> To: KRnet <kr...@mylist.net> On 12/26/2011 9:56 PM, Tony King wrote: > One significant factor, regardless of which end it's being driven from, > is > that the torsional loads imposed on the crank in an automotive > application > are vastly smaller than those imposed by a propellor spinning at 3000 > rpm. On a theoretical note: Isn't the flywheel meant to store the energy imparted to the crank between the power pulses? And if that is the case, doesn't a lighter flywheel tend to cause the torsion differential between the pulses on the crank to increase versus a heavier flywheel which will tend to store the energy longer. This is comparable to what a filter circuit does in electronics. If I reduce the capacity of a filter, then the ripple voltage will increase, especially under heavy loads. Perhaps a heavier flywheel should be considered, especially in an engine which is being increased in its power output. I'd be interested in hearing the science on this. -- 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 -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 8.5.454 / Virus Database: 271.1.1/4103 - Release Date: 12/25/11 19:34:00
