PPRuNe Forums - View Single Post - High accident rates in light twins an alternative?
Old 1st Jun 2008, 22:09
  #64 (permalink)  
Wizofoz
 
Join Date: Jun 2001
Location: Boldly going where no split infinitive has gone before..
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To clear up a few points yes it is obvious that the faster you go the more drag there will be, not in question.
Actually, you have repeatedly said you believed the aircraft produced LESS drag at greater speed because of reduced A of A, and got rather snooty with me when I pointed out that, above Min drag speed, drag inceases.

VYSE is the speed set in the climb where on one engine you have minumum drag and the best speed to make the maximum climb possible.

Absoluttely. Being trying to get that across to you. Now, if the BEST rate of climb is zero, what rate of climb will you get if you fly faster (I'll give you a hint, it starts with a minus sign.)

I am shown graphs designed at a single engine climb and power from an engine and these are used to rubbish cruise. Fair enough but then that in itself is a blinkered misconception.
No, they are NOT climb graphs. They show how much drag is produced at given airspeeds, and therefore how much power is required to maintain LEVEL flight.

Wizofox fails to respond with the scientific/ aerodynamic reasononing for the above and gets out of it by demanding I answer irrelevent questions to the arguement of his first.
Wizofoz has told you several times, and been backed up by several other experienced aviation specialists, that the difference between climb and cruise is that excess power is used to increase speed instead of increase altitude. You boggle at the fact that the amount of power it takes to make a two ton aeroplane climb at 100' per minute will, if re-directed, make at accelerate 25 knot, but that is what happens.

My guess not being a scientist is that in any climb situation there is only one energy source available and that is the remaining engine. That remaining engine has NO assistance from Kinetic energy as the aircraft and engine are in a negative situation. The remaining engine trying to drag the aircraft skywards and in the process making the most of the process by selecting a minimum drag profile and speed.
I can't comment on this 'cause I can't work out what the HELL you're talking about!!

So Wizofox with all your knowledge please enlighten me to the relevant scientific facts of why a twin will fly happily for hours on one But will not climb?
Easy, it won't. If it won't climb at Vyse, it won't cruise at any other speed. Simple.
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