Today's Message Index:
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1. 12:05 AM - Re: Re: Losing rpm on takeoff (b d)
2. 03:12 AM - Re: Re: Losing rpm on takeoff (Heinz Lang)
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| Subject: | Re: Losing rpm on takeoff |
*I've just had more fun out of this than anyone is entitled to have. We've
drug this ol' carcass until there is just no hyde left on it. You guys take
over now alright :-) God it's been fun but I have to go cavitate my stall .
. . LOL*
On Thu, Dec 2, 2010 at 11:49 PM, Michael Gibbs <MichaelGibbs@cox.net> wrote:
>
>
> Bruce sez:
>
> Cavitation and stall are quite the same but with different mediums, it's
>> still only semantics.
>>
>
> Guy's explanation shows clearly that this is NOT the case. From Wikipedia
> <http://en.wikipedia.org/wiki/Cavitation>: "Cavitation is the formation of
> vapor bubbles of a flowing liquid in a region where the pressure of the
> liquid falls below its vapor pressure."
>
> No mention of angle of attack or separation from a surface. And air
> doesn't changing phases in a stall!
>
>
> You only said the same thing the first feller said a long time ago but yet
>> another way. We all get it.
>>
>
> Apparently not... :-|
>
> Mike G.
> N728KF, Kitfox IV-1200 Speedster
> Phoenix, AZ
>
>
> On Thu, Dec 2, 2010 at 10:44 PM, Guy Buchanan <<mailto:gebuchanan@cox.net>
>> gebuchanan@cox.net> wrote:
>>
>> gebuchanan@cox.net>gebuchanan@cox.net>
>>
>>
>>
>> On 12/2/2010 1:52 PM, b d wrote:
>>
>> Yes, it's semantics, with a prop in a liquid (a hydrofoil) it's called
>> cavitation and with an prop in air (an airfoil), it's called a stall but
>> essentially the same-o same-o.
>>
>>
>> OOO I LOVE semantics. Actually, cavitation is quite different from stall.
>> Cavitation involves a phase change from liquid to gas due to pressure drop
>> over the airfoil. Since the gas is compressible it vacates the low pressure
>> region of the airfoil destroying lift. Stall is where the streamlines in the
>> low pressure region depart catastrophically from the airfoil surface. It can
>> happen in liquids and well as gasses. Stalling the liquid does not result in
>> gas formation, or cavitation, but results merely in turbulent flow. I used
>> to do it in the sailboat all the time.
>>
>> Guy Buchanan
>> Kitfox IV-1200 / 592-C / Warp 3cs / 500 hrs.
>>
>
>
Message 2
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| Subject: | Re: Losing rpm on takeoff |
I think this is normal for self adjusting Warp Drives. My data for KF
IV-1200 R582, at full power are, static: 6800RPM, climb with 60mph: 6500RPM.
This setting is ideal for me.
Regards
Heinz Lang
Switzerland
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