Tracy Crook wrote:

 Some more numbers for the list. Figures for N84TC,   Tracy Crook

Type of airplane?   Vans Aircraft  RV-4

prop dia?     68"

prop pitch?    71"

prop make?  Performance Propeller

top air speed?   214 mph at ~SL @ 6400 rpm

cruise air speed at what alt?   175 mph @ 12,500  (This is econo

cruise setting, not WOT)

GPH at cruise?  6.25 - 6.5 gph

exhaust temp?  1550 - 1600 F (cruise)

rate of climb FPM at what weight?  2300 FPM  @ 1180 lb (just me

and 10 gal fuel aboard)

size of water rad? 1  @ 9 x 13 x 3.75   +  1 @ 9 x 10 x 3.75

size of oil cooler?   stock 1976 Mazda Cosmo

OAT above which water does not cool during climb?  Reaches 204

redline when OAT is 92 F at WOT climb @ 130 mph climb speed, 2000 fpm

OAT above which oil does not cool during climb?     Reaches 210

redline  (same conditions as water)

                    Above figures have not been re-tested since making
cooling inlet improvements inspired by Paul's pressure tests.   Max
allowable OAT is higher now                     but won't have exact number
until next summer.

Max climb rpm        5400 @ 130 mph
usual cruise rpm        5200 - 5300
carb,efi, ei, turbo        EC2 EFI , Normally aspirated
reduction ratio            2.176 - 1   RD-1B

Engine type (13B or 20B)     89 turbo block w/ 9.7 - 1 CR rotors
Gross Weight, Max Weight   1500 lb  (Van's rating)   Has been flown at

1650 w/ CG within spec. range.

Significant modifications         NA rotors in turbo block.  No

significant porting.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

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