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Author Topic: Supercharger stageing, compounding,  (Read 35038 times)

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Offline jl222

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Re: Supercharger stageing, compounding,
« Reply #60 on: May 06, 2009, 12:51:37 AM »
 
  Bvillercr will be posting some fotos when he gets a chance of some Pratt and Whitney two stage super chargers of WW11.
  Both show the superchargers for the R2800 radial engine. One for the 10W series [the W stands for water injection or ADI]
 and the other the 32W series. Check out those twin sidewinder centrifugal blowers that went to intercoolers and back to the carb and
 into the blower at back of engine. Total of THREE superchargers and they were two speed also, including the 10W.
   All those years racing without intercoolers.

     JL222 :cheers:



« Last Edit: May 06, 2009, 12:55:42 AM by jl222 »
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Offline bvillercr

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Re: Supercharger stageing, compounding,
« Reply #61 on: May 06, 2009, 10:20:46 AM »
Pictures as promised.







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Offline jl222

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Re: Supercharger stageing, compounding,
« Reply #62 on: May 06, 2009, 12:41:46 PM »
 
 The top foto showing the air flow from first stage supercharger is only one side, the same setup was on other side
of airplane. Its hard to make out but airflow from the intercoolers went through carb then to second supercharger
were the air was compressed a second time. These blowers were also two speeds.
 Some aero superchargers were three and four speeds.
 We have a lot of catching up to do. This technology is 65 years old or more!!

    JL222
 
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McRat

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Re: Supercharger stageing, compounding,
« Reply #63 on: May 06, 2009, 02:56:52 PM »
It might be old tech, but huge amounts of development dollars were spent on it.  IIRC, the B-29 program was one of the most expensive projects in the history of the US (corrected for inflation), I think it cost more than the Manhattan Project.   How much went into engines development?  Dunno.
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Offline floydjer

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Re: Supercharger stageing, compounding,
« Reply #64 on: January 04, 2010, 09:10:10 AM »
This thread looked lonely so...........I did some research on compound supercharging and found a site claiming the Wankel rotary was originally designed to be used as a supercharger. Wonder if one has been adapted for that use and the result. :?
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Offline SPARKY

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Re: Supercharger stageing, compounding,
« Reply #65 on: January 04, 2010, 10:21:21 AM »
I don't see why not, in a lot of ways the Wankle is a lot like the DeLaval slide vane vacum pump we had on the dairy.
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Offline interested bystander

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Re: Supercharger stageing, compounding,
« Reply #66 on: January 04, 2010, 10:51:08 AM »
FYI the 50cc Kreidler 140 mph plus record motorcycle of the mid 60's was Wankel supercharged.
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Offline robfrey

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Re: Supercharger stageing, compounding,
« Reply #67 on: January 07, 2010, 11:56:05 PM »
This is a great thread. Lots of deep thinking!
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Offline robfrey

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Re: Supercharger stageing, compounding,
« Reply #68 on: January 08, 2010, 12:14:50 AM »
Has anyone ever tried to use a small turbine engine to power the supercharger? Would that be legal as the rules are written now?
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Offline robfrey

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Re: Supercharger stageing, compounding,
« Reply #69 on: January 08, 2010, 12:22:43 AM »
BTW, the computer says that it takes 247 hp to spin our GT4718 turbos @23psi and 7k rpm on our 540.
I would love to get that back. Also I could open up camshaft duration / overlap and free up even more as back pressure would be eliminated.
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Offline RichFox

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Re: Supercharger stageing, compounding,
« Reply #70 on: January 08, 2010, 09:03:54 AM »
Quote from: robfrey on January 08, 2010, 12:14:50 AM
Has anyone ever tried to use a small turbine engine to power the supercharger? Would that be legal as the rules are written now?
No.Aux power to drive the blower is not allowed.
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Offline bbarn

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Re: Supercharger stageing, compounding,
« Reply #71 on: January 08, 2010, 03:02:07 PM »
Quote from: RichFox on January 08, 2010, 09:03:54 AM
Quote from: robfrey on January 08, 2010, 12:14:50 AM
Has anyone ever tried to use a small turbine engine to power the supercharger? Would that be legal as the rules are written now?
No.Aux power to drive the blower is not allowed.

No aux power in *ANY* class or is it allowed in the streamliner class?
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Offline RichFox

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Re: Supercharger stageing, compounding,
« Reply #72 on: January 08, 2010, 03:11:15 PM »
Your blower must be driven by the same engine that drives the car See 4.FF...."powered by the primary engine"  No deal. You can't do it.
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Offline Stan Back

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Re: Supercharger stageing, compounding,
« Reply #73 on: January 08, 2010, 07:14:13 PM »
What if it's in a trailer?
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Offline jl222

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Re: Supercharger stageing, compounding,
« Reply #74 on: January 08, 2010, 08:22:55 PM »
Quote from: RichFox on January 08, 2010, 03:11:15 PM
Your blower must be driven by the same engine that drives the car See 4.FF...."powered by the primary engine"  No deal. You can't do it.

  There could be an argument in AA streamliner or lakester as they are allowed multible engines AND the rule book states ''innovation is unlimited''

               JL222
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