Hi, was reading this intersting thread on using the 13B rotary in an aircraft. I have a couple of questions maybe someone can answer....
How much HP do most of the PRSU units take to drive? The only knowlege I have to draw on here is dyno'ing motorcycle engines (both air cooled and water), and usually I've seen about a 15-20% reduction in HP when comparing "Rated HP" to "Rear Wheel HP".
The following is a list of rated hp for various 13B's. Seems like best case you could see around 160hp in NA configuration if you split the difference between relibility/performance (total WAG on my part). I've heard that the intake needs to be shortend significantly so doesn't that drop it even more? Given that and lets say 15% for the PSRU is a realistic figure to the PROP more like 136?
Whats an honest, realistic figure?
Eng. Yrs Model cc x rotors Comp BHP/rpm, Torq(lb-ft/rpm)
13B 73 R130 (Japan) 654 x 2 = 1308 9.1 125/6000, 127/3500
13B 74-75 RX-4 654 x 2 = 1308 9.2 110/6000, 117/3500
13B 76-78 RX-4 654 x 2 = 1308 9.2 110/6000, 120/4000
13B 76-78 RX-5 (Cosmo) 654 x 2 = 1308 9.2 110/6000, 120/4000
13B DEI 84-85 RX-7 (GSL-SE) 654 x 2 = 1308 9.4 135/6000, 133/2750
13B DEI 86-89 RX-7 2nd gen 654 x 2 = 1308 9.4 146/6500, 138/3500
13B Turb 86-89 RX-7 Turbo II 654 x 2 = 1308 8.5 182/6500, 183/3500
13B 89 Luce (Japan929) 654 x 2 = 1308 8.5 177/6500, 181/3500 JIS
13B VDEI 89-92 RX-7 Light Rotor 654 x 2 = 1308 9.7 160/7000, 140/4000
13B Turb 89-91 RX-7 T II Lt Rtr 654 x 2 = 1308 9.1 200/6500, 196/3500
13B Twin 92+ RX-7 Seq. Turbo 654 x 2 = 1308 9.0 255/6500, 217/5000