Article #4 ...

That is all fine and dandy you say, but what if I have a high wing taildragger with a welded steel tube fuselage, with lots of diagonal tubes on the bottom of the 4 frame. In other words no place or room to put a belly duct with radiator without a major rework and redesign of the steel tube frame. The radiator (or radiators) have to go into the engine cowling. This naturally is a less than ideal location and can give you some dandy problems. The drawing below shows wind-tunnel results on a front engine installation.

Everybody has at one time or another come across this cowling shape (Fig. 22). Notice the split between the pressure and lift on the spinner! This is one reason why you should have a good spinner bulkhead in front of the propeller. The forces on a large spinner can be substantial. Notice the lift on the front part of the cowling which is trying to suck the front end open. This is a good place for some exhaust louvers or openings for venting hot air out of the engine compartment. Further back on the cowling and in front of the windshield we have high pressure air. A good place to install an air intake. That is exactly where most cars have the fresh air pickup. It is also the place where Porsche and other sports cars pick up the cooling air forthe turbo intercooler.

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From: Jeff Whaley <jwhaley@datacast.com>
Sent: Monday, October 31, 2022 8:14 AM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Radiator OPS / Placement Links

 

Hi Le Roux, I think you'll be the first to try a top-mounted radiator on a Rotary install.  Generally and with reference to those Hans Meyer articles, the pressure on top of the cowling is near zero or even negative until you get really close to the windshield.  I won't say it can't be done but it's going to be tricky - you may need a fan and most likely will need a fan during ground operations. Good luck - keep us posted ... Jeff

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From: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Monday, October 31, 2022 6:01 AM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: flyrotary Digest #5273

 

        Rotary motors in aircraft Digest #5273

 1) Re: Radiator OPS / Placement Links
    by "Erik Snyman erik.snyman@bigpond.com" <flyrotary@lancaironline.net>
 2) Re: Radiator OPS / Placement Links
    by "Le Roux Breytenbach breytenbachleroux@gmail.com" <flyrotary@lancaironline.net>
 3) Re: Radiator OPS / Placement Links
    by "Le Roux Breytenbach breytenbachleroux@gmail.com" <flyrotary@lancaironline.net>
 4) Re: Radiator OPS / Lamar cooling book
    by "Marc Wiese cardmarc@charter.net" <flyrotary@lancaironline.net>
 5) Re: Radiator OPS / Placement Links
    by "Marc Wiese cardmarc@charter.net" <flyrotary@lancaironline.net>
 6) Re: Radiator OPS / Placement Links
    by "Chris Sargent cleesgt@gmail.com" <flyrotary@lancaironline.net>
 7) Re: Radiator OPS / Placement Links
    by "Le Roux Breytenbach breytenbachleroux@gmail.com" <flyrotary@lancaironline.net>
 8) Re: Radiator OPS / Placement Links
    by " 12348ung@gmail.com" <flyrotary@lancaironline.net>
 9) RV-9A exhaust and Radiator Placement
    by "Doug Lomheim rv9flyer13b@gmail.com" <flyrotary@lancaironline.net>
10) Re: RV-9A exhaust and Radiator Placement
    by "Rob McMillan robmcmillanpls@gmail.com" <flyrotary@lancaironline.net>

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