ASA New Product Video is up! (July 2014)

[moll780]

i want one!

[NYTOM]

Originally Posted by Bavafa

Not only I don?t sense it that way, I do appreciate it when an alternative view and information is provided which some of us might not be experienced enough to note.

This is especially valuable for me when the alternative view is presented with engineering reasoning and facts which is the case here.

True, but sometimes that alternate engineering reasoning is just opinion and any facts are not really facts till checked.
Just saying. There sure are a lot of opinions around here and you know what they say about opinions!

[Bavafa]

Originally Posted by NYTOM

True, but sometimes that alternate engineering reasoning is just opinion and any facts are not really facts till checked.
Just saying. There sure are a lot of opinions around here and you know what they say about opinions!

Absolutely, but I also believe that some opinions carry more credibility than others which in the context of this discussion is often established thru display of craftsmanship, technical knowledge/knowhow and sound reasoning.

[Steve Melton]

is there any braking benefit when opening the cowl on approach?

[Mel]

Normally with cowl flaps, it's best to keep them closed on approach to reduce excessive engine cooling.
I don't think you'll see any speed reduction at approach speeds.

[PerfTech]

Originally Posted by Steve Melton

is there any braking benefit when opening the cowl on approach?

...Need to agree with Mel on this one but I did play with it and was no detectable difference. One thing I did find very surprising though. I went to a cruising altitude, trimmed and set the auto pilot at 170 kts. I waited and let everything settle down then opened both cowl flaps to see the effect on speed. To my surprise it was only about 2 to 3 kts. I was sure it would be more than that. I think this is great! Thanks, Allan...

[Pmerems]

Allan,

Do you have any photos of the inside of you lower cowl with the cowl flap installed? There are a few variations of Vettermen exhausts produced over the years. Also the heat muffs also vary in location. Do you have photos from some of the beta testers installationsl that might show the cowl flap installed on aircaft with the varying exhaust systems

Any images would be helpful.

[PerfTech]

Originally Posted by Pmerems

Allan,

Do you have any photos of the inside of you lower cowl with the cowl flap installed? There are a few variations of Vettermen exhausts produced over the years. Also the heat muffs also vary in location. Do you have photos from some of the beta testers installationsl that might show the cowl flap installed on aircaft with the varying exhaust systems

Any images would be helpful.

... I am sorry but the photos I have probably are not what you need. I will post a few here and on next cowl removal I will shoot some good ones. This is the exhaust system on my RV-9 and is the most popular one. Also you can see my heat shields that stop the radiated heat from attacking the cowl etc.
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Thanks, Allan...

[PerfTech]

....Here are the pressure differential numbers we gathered on my airplane (RV-9A). These percentages of increases were typical of what was gathered on all the other tests aircraft with stock Vans factory cowl. We installed a second unit and tested the improvement as many people were ordering two and ask for this differential information.
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[mtnclimber]

Alan, You mention "percentages of increase", but these look like absolute numbers. What are the units of pressure measurement?

Roger