Been thinking (smoke is rising)

[Andy95W]

2 hours ago, aviatoreb said:

What is that little hole doing?

That is the air intake for the engine, intended to take advantage of positive pressure to increase Manifold pressure.  We would have to ask a Missile owner if it works.

[Alan Fox]

I hate to burst your bubble , but the back of the prop is the "High pressure" side ,  Don't think on a moving aircraft , it makes any difference , also , Having owned numerous Mooneys with Ram air , The only "increase" is the bypass of the friction loss from the filter... 

 

[Andy95W]

Hey, I didn't say it worked, just that Rocket Engineering had already done what he was proposing!

[Dream to fly]

The idea obviously inspired someone to think about it and try.  It would be cheap free power if it worked.  But I am starting to learn aviation and cheap or free can't coexist.

[M20FanJesse]

3 hours ago, Skates97 said:

I was just about to post a shout out to Jesse but you beat me to it.

I can do something like that. 

 

5 hours ago, Hank said:

@M20FanJesse, are you paying attention? I may have to get one of these myself . . . . . 

So more or less exactly? Or mooney compared to WWII planes?

[Hank]

3 hours ago, M20FanJesse said:

I can do something like that. 

 

So more or less exactly? Or mooney compared to WWII planes?

The M20 vs. P51. The wing is almost exactly the same, but a little bit smaller.

[carusoam]

A Long Body + P51 = 

The length of the cowl really makes the difference.

Al must have had a great day when he penned the scaled version of the P51...

Best regards,

-a-

[FloridaMan]

On 7/25/2017 at 4:13 PM, Dream to fly said:

I have been looking over my plane and all the comments on the ROP/LOP and without a monitor I am guessing what is really going on.  I fully understand that BUT what if I build a poor mans turbo and can collectively pull forced air off the prop and funnel it into the cowl scoop.  Would it not "charge" the intake a little giving me more MP.   

Yes. Absolutely. I believe this is the primary reason for the increase in performance from the LoPresti cowling: prop pressure. I gain between 1 and 2 inches of MP at altitude with the ram air open. 

Also, you should get an engine monitor. I would not have noticed the sudden 5psi drop in oil pressure that led me to inspect the oil filter, where I found metal, and then when the engine was torn down the shop found the main bearing that had spun.