Project Airflow - MVAgusta.net
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post #1 of 24 (permalink) Old 12-16-2007, 11:59 AM Thread Starter
lee
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Project Airflow

In an attempt to increase the efficiency of the rad fans and hence airflow through the rad I've done some fiddling. I added "ducts" to both fans to close off the gaps between the fans and the rads (the top one was really huge and drawing alot of air through it instead of the rad), to reduce the distance from the blade tips to the duct surface and to cover the entire edge of the blade to reduce flow loss and keep more air moving aft. As an illustration I've included a picture of a trashed first stage compressor blade out of a CFM engine on an Airbus. Note the squared off and slightly radiused tip. The edge is just thousandths of an inch from the inside of the engine and completely covered by same. 99.9 percent of the air coming through the intake goes into the engine. Almost nil losses there. It is the most efficient example of a "fan" that I know of, and I was applying that techology to the rad fans as best I could. For sure they're going to pull more air through the rad but don't know how much.

That blade, by the way, is made of solid titanium alloy. It got trashed as a result of a baby carriage rolling across the ramp into the death zone and the engine gobbled it up right now. You can see the goober on the outer edge.

I'm going to add an additional fan from a Duc 1098 to the lower left corner in order to get better coverage. Alot of area there with no fan. Keep you posted.
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post #2 of 24 (permalink) Old 12-16-2007, 12:23 PM
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I hope a baby wasn't in that carriage!

Nice work ... keep us posted on the results!
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post #3 of 24 (permalink) Old 12-16-2007, 12:26 PM
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make sure the new shroud does not touch the radiator...vibration could cause a hole in the thin core passages.

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post #4 of 24 (permalink) Old 12-16-2007, 12:42 PM Thread Starter
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C'mon Lewdog. Of course it doesn't touch. 040"-050" off it.

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post #5 of 24 (permalink) Old 12-16-2007, 01:28 PM
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The Brutale has a rubber piece that seals the outer fan 'cage' to the rad

(This reply has not been checked for punctuation, grammar, or spelling mistakes and is devoid of any big long cleverwords or condescending manner)


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post #6 of 24 (permalink) Old 12-16-2007, 01:33 PM Thread Starter
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I am toying with the idea of slitting some very small tubing and putting it around the edge to protect the rad.

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post #7 of 24 (permalink) Old 12-16-2007, 08:15 PM
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Quote:
Originally Posted by lee
C'mon Lewdog. Of course it doesn't touch. 040"-050" off it.


somehow I knew you would have a response like that....but I have to be quite honest and say that I am a little disappointed..... a varience of .010".... what kind of crude measuring tools are you using.....let me guess....i bet its the ruler molded into the top of your fishing tackle box.

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post #8 of 24 (permalink) Old 12-16-2007, 08:26 PM
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Good stuff lee, keep us posted.

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post #9 of 24 (permalink) Old 12-16-2007, 09:53 PM Thread Starter
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lewdog baby,

Nothing quite so precise I'm afraid. I just slide a dime under it and if it goes then it's good enough. I use nickles for the really big stuff.

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post #10 of 24 (permalink) Old 12-17-2007, 03:08 AM
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Quote:
Originally Posted by lee
I am toying with the idea of slitting some very small tubing and putting it around the edge to protect the rad.
Good idea, one other area to look that I have noticed is becauase the air has a tortoreous path out of the fairing enclosure a lot of it simply comes out over the top of the rad by the lower triple clamp and straight back into the top fan, not a good idea.
On the later R/312 models there are also a lot of gaps around the lower V piece that causes the same thing.

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Previously (and about 40 others)748SP, S4, S4R, 98R1, 2000 F4, F41000S, F41000R, 08R1, 09R1, S1000RR, RSV4 Factory aPRC in Garage now
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