Mazda Rotary Engine

HomeBuiltAirplanes.com

Help Support HomeBuiltAirplanes.com:

Armilite

Well-Known Member
Joined
Sep 5, 2011
Messages
3,488
Location
AMES, IA USA
With even mild peripheral porting and boost, turbo 13Bs in aircraft have no trouble exceeding 200hp at 5500 rpm, and they'll happily turn faster than that and make more power.
================

True, you can push any Engine to make more hp, but there is a Point in Continuous use for Hours like on a Plane where you can go too far! You can do the Porting, you can use the High Temp O-rings, the Ceramic Apex Seals, and today you do have better Synthetic Oils to use. Just as every Plane has a limit on Prop Size it can use! You can use the Light Weight Housings to Save on Weight. How much Boost is too Much for Aircraft use? Finding a Reliable Reduction Drive was the biggest problem for many Years. For Endurance, a Long Service Life your probably looking at Max 6500rpm! 6500/2750rpm = 2.363 Ratio. As I said, the output of late 13B-T was 185 hp (138 kW) at 6500rpm! To make 200hp and using a lower Max rpm, means more Boost!

4500rpm/2750rpm= 1.636 Ratio!

5000rpm/2750rpm= 1.818 Ratio!

Is there even a Redrive in them (2) Ratio's to meet his Mission?

Wouldn't a 20B 2.0-liters be a better option? The 20B-REW in the Eunos Cosmo is referred to as the production 20B. In this guise, it’s remarkably powerful, putting out 300 horsepower and 403 Nm of torque thanks to the combination of 2.0-litres and sequential turbocharging at just 0.7 bar of boost = 10.15264 psi. I didn't see at what rpm it was rated. It would be better to Detune a 20B to his desired 200hp.


5500rpm/2750rpm= 2.0 Ratio!

6000rpm/2750rpm= 2.181 Ratio!

6500rpm/2750rpm= 2.363 Ratio!
 

dwalker

Active Member
Joined
Mar 6, 2021
Messages
44
================

True, you can push any Engine to make more hp, but there is a Point in Continuous use for Hours like on a Plane where you can go too far! You can do the Porting, you can use the High Temp O-rings, the Ceramic Apex Seals, and today you do have better Synthetic Oils to use. Just as every Plane has a limit on Prop Size it can use! You can use the Light Weight Housings to Save on Weight. How much Boost is too Much for Aircraft use? Finding a Reliable Reduction Drive was the biggest problem for many Years. For Endurance, a Long Service Life your probably looking at Max 6500rpm! 6500/2750rpm = 2.363 Ratio. As I said, the output of late 13B-T was 185 hp (138 kW) at 6500rpm! To make 200hp and using a lower Max rpm, means more Boost!

4500rpm/2750rpm= 1.636 Ratio!

5000rpm/2750rpm= 1.818 Ratio!

Is there even a Redrive in them (2) Ratio's to meet his Mission?

Wouldn't a 20B 2.0-liters be a better option? The 20B-REW in the Eunos Cosmo is referred to as the production 20B. In this guise, it’s remarkably powerful, putting out 300 horsepower and 403 Nm of torque thanks to the combination of 2.0-litres and sequential turbocharging at just 0.7 bar of boost = 10.15264 psi. I didn't see at what rpm it was rated. It would be better to Detune a 20B to his desired 200hp.


5500rpm/2750rpm= 2.0 Ratio!

6000rpm/2750rpm= 2.181 Ratio!

6500rpm/2750rpm= 2.363 Ratio!
The problem is your information is 30 years out of date.
 

Lendo

Well-Known Member
Joined
Feb 6, 2013
Messages
625
Location
Brisbane
rv7charlie. Well JC's program (that Jan Carlsson - now dec'd), is pretty good, it depends on 'data-in' like Hp for Cruise and Max, it also allows flexibility (within reason) for Prop Diameter. I started a week ago to reverse engineer the Math and only today worked-out the last input, it's not hard but can be a very tricky to follow. I' haven't worked through all his math but have now discovered all the Prop Pitch along the blade percentages, with corresponding Angles. That understanding is a big step for me. It's one thing to see a program work and another to understand how it works.

You may wonder why I went to the bother of doing this, well one it is the understanding, and two I had copies on two computers and one corrupted and I figured I would have ended up with nothing if the other one crashed and I didn't understand the Math.
George
 

Latest posts

Top