Re: From THe Bear Cave: John Penney Interview On Speed Channel Tonight 7:00PM Pacific
Interesting fact about the Bear (and aircraft piston engines in general) that folks don't talk about is the HUGE amount of torque they make.
Useing the formula that HP = TorqueXrpm divided by 5252, comparisons can be made.
Untill last year nobody really knew how much HP a top fuel dragster or fuel funny car actually made. Estimates based on performance indicated somewhere north of 6000hp but no dyno exists that can measure it. Finally, somebody came up with some sort of strain guage that can attach to the driveshaft and actually measure HP during a run. Under the old 90% nitro rule (they are now limited to 85%), on at least 2 passes the guage indicated 8000 hp for a couple thousandths of a second. But useing the above formula, and an rpm of 8000 which is about what they run, that comes out to 5252 foot pounds of torque, and of course that only lasts less than 5 seconds.
Assuming Rare Bear make 4000 hp at 3000 rpm, that is an astounding 7002 foot pounds of torque for several 8-10 minute races in a row!
No other motorsport in the world can make that claim as far as I know.
Ron Henning
Interesting fact about the Bear (and aircraft piston engines in general) that folks don't talk about is the HUGE amount of torque they make.
Useing the formula that HP = TorqueXrpm divided by 5252, comparisons can be made.
Untill last year nobody really knew how much HP a top fuel dragster or fuel funny car actually made. Estimates based on performance indicated somewhere north of 6000hp but no dyno exists that can measure it. Finally, somebody came up with some sort of strain guage that can attach to the driveshaft and actually measure HP during a run. Under the old 90% nitro rule (they are now limited to 85%), on at least 2 passes the guage indicated 8000 hp for a couple thousandths of a second. But useing the above formula, and an rpm of 8000 which is about what they run, that comes out to 5252 foot pounds of torque, and of course that only lasts less than 5 seconds.
Assuming Rare Bear make 4000 hp at 3000 rpm, that is an astounding 7002 foot pounds of torque for several 8-10 minute races in a row!
No other motorsport in the world can make that claim as far as I know.
Ron Henning
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