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Re: SCAT superlight crank [Re: polyspheric] #2578964 11/15/18 11:08 PM 11/15/18 11:08 PM
Joined: Mar 2003 Posts: 9,099 Rogue River, OR Jeremiah master
Jeremiah master Joined: Mar 2003 Posts: 9,099 Rogue River, OR	target bobweight? I'm surprised no one has asked.

Re: SCAT superlight crank [Re: Jeremiah] #2579017 11/16/18 02:22 AM 11/16/18 02:22 AM
Joined: Jan 2003 Posts: 31,021 Oregon A AndyF OP I Win
AndyF OP I Win A Joined: Jan 2003 Posts: 31,021 Oregon	Bobweight for the engine I'm building should be around 2300 grams. I don't have the pistons yet so I'm just guessing where they'll come in at. The Molnar rods are fairly light for a 7.100 long rod.

Re: SCAT superlight crank [Re: AndyF] #2580631 11/20/18 02:30 PM 11/20/18 02:30 PM
Joined: Jan 2003 Posts: 16,376 D dogdays I Live Here
dogdays I Live Here D Joined: Jan 2003 Posts: 16,376	Consider the shapes of the leading and trailing edges of the counterweights. Experiments with shape run quite a while ago showed that the rounded leading edge and tapered trailing edge had the least amount of drag. So, I would say the crank manufacturer knew EXACTLY which direction the crank would turn. R.

Re: SCAT superlight crank [Re: dogdays] #2580638 11/20/18 02:39 PM 11/20/18 02:39 PM
Joined: Jan 2003 Posts: 17,843 S.E. Michigan ZIPPY I Live Here
ZIPPY I Live Here Joined: Jan 2003 Posts: 17,843 S.E. Michigan	Originally Posted By dogdays Consider the shapes of the leading and trailing edges of the counterweights. Experiments with shape run quite a while ago showed that the rounded leading edge and tapered trailing edge had the least amount of drag. So, I would say the crank manufacturer knew EXACTLY which direction the crank would turn. R. I bought a new K1 4.500 RB crank a few weeks ago, it has the same counterweight shape on the leading/trailing edges as described. This seems to be the conventional wisdom these days. Rich H. Esse Quam Videri

Re: SCAT superlight crank [Re: AndyF] #2580721 11/20/18 06:12 PM 11/20/18 06:12 PM
Joined: Jan 2003 Posts: 31,021 Oregon A AndyF OP I Win
AndyF OP I Win A Joined: Jan 2003 Posts: 31,021 Oregon	I'm sure that the engineer at SCAT was going with a tear drop design on the counterweights. So a rounded nose and a v shaped tail. I talked to the engineer a few times when he was working on the CAD file for the superlight but I don't think we discussed the shape of the counterweights.

Re: SCAT superlight crank [Re: AndyF] #2580725 11/20/18 06:24 PM 11/20/18 06:24 PM
Joined: Mar 2006 Posts: 9,835 MI, usa dvw master
dvw master Joined: Mar 2006 Posts: 9,835 MI, usa	The bob weight of my 572 with Molnar 7.100"x 2.200" rods, Molnar 4.500' x 2.200" crank, Diamond 4.500" flat tops is 2238 grams Doug

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