Author Topic: B-29 air speed  (Read 2003 times)

Offline icepac

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Re: B-29 air speed
« Reply #15 on: July 05, 2011, 01:46:13 PM »
I paced a b17 in level flight at 28k feet for 5 minutes and it was going 310mph ground speed.

That seems awful fast.

Offline Fud

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Re: B-29 air speed
« Reply #16 on: July 05, 2011, 03:11:57 PM »
Even the light B-17 I flew for Collings didn't indicate 180...closer to 160-165.  A WWII B-17 guy said it "was a 150 mph airplane -- climbed at 150, cruised at 150 and descended at 150".

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Offline Widewing

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Re: B-29 air speed
« Reply #17 on: July 05, 2011, 04:30:59 PM »
Screen shot of B-29 and E6B opened...

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Offline RTHolmes

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Re: B-29 air speed
« Reply #18 on: July 05, 2011, 04:37:41 PM »
does the 29 have perma-WEP like the other US heavies?
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Offline Stoney

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Re: B-29 air speed
« Reply #19 on: July 05, 2011, 04:41:29 PM »
I paced a b17 in level flight at 28k feet for 5 minutes and it was going 310mph ground speed.

That seems awful fast.

Did you film it?
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Offline Stoney

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Re: B-29 air speed
« Reply #20 on: July 05, 2011, 04:42:45 PM »
does the 29 have perma-WEP like the other US heavies?

 :bhead
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Offline RTHolmes

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Re: B-29 air speed
« Reply #21 on: July 05, 2011, 04:46:27 PM »
 :lol
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Offline Raptor05121

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Re: B-29 air speed
« Reply #22 on: July 05, 2011, 08:35:07 PM »
does the 29 have perma-WEP like the other US heavies?

what is this i dont even
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Offline Stoney

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Re: B-29 air speed
« Reply #23 on: July 05, 2011, 09:18:02 PM »
what is this i dont even

Don't ask...seriously.  Ignore or else we all face mortal message board peril...
"Can we be incorrect at times, absolutely, but I do believe 15 years of experience does deserve a little more credence and respect than you have given from your very first post."

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Offline RTHolmes

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Re: B-29 air speed
« Reply #24 on: July 05, 2011, 11:24:49 PM »
private joke for Stoney aside ;)  I noticed the Takeoff Power setting on the E6B in the screenie, how long do you get?
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Offline Krusty

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Re: B-29 air speed
« Reply #25 on: July 06, 2011, 08:54:48 AM »
standard 5 minute WEP last I recall

Offline LLogann

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Re: B-29 air speed
« Reply #26 on: July 06, 2011, 09:25:51 AM »
I don't think 380 is unreasonable.  You've got about 1/11th of a fuel load (full load is about 6600), no bombs, maybe light on the guns?  82k vs. 120k, which is the rated weight for 356mph.  Take a third off the weight for an extra 25mph sounds about right to me without running the numbers.   :cheers:

Screen shot of B-29 and E6B opened...

(Image removed from quote.)
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Offline Krusty

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Re: B-29 air speed
« Reply #27 on: July 06, 2011, 09:31:20 AM »
Weight alone doesn't dictate speed because it's internal.

Adding about 500lbs to the wings of a Fw190A8 with the 30mm guns package reduces speed only 1mph, from memory and comments on the forums dating back many years.


Offline Debrody

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Re: B-29 air speed
« Reply #28 on: July 06, 2011, 10:26:27 AM »
Weight alone doesn't dictate speed because it's internal.
ehm...  nope
If youre flying a 262 at 220mph, the nose will point up about 5-8 degrees, if youre flying at 500mph+, the nose will point down 1-2 degrees (in level flight of course).
Why?
In straight level flight the sum of al the forces taking effect on the plane is zero, right? (straight movement without any acceleration)
What are the forces attacking the aircraft? There is the gravity, the thrust, the drag and the lift.
Lets see the lift first. Its about the air pressure differences over and under the wings, what also comes from two components. The first one is from the wings aerodinamic profile what can counter the gravity if the plane goes totally straight, its nose isnt pointing up or down. The second component is from the airflows angle of attack.If its zero degrees, the it has minimal effect on the drag, but even if its 4-5 degrees, the drag will increase dramatically causing the plane to slow down, while the lift is increasing.
Summa summarum if you have a light aircraft, you dont need to use this second component, the plane will be able to go fast. If your aircraft is heavy (even if its all internal), the lift will have to counter the gravity force coused by the extra weight, and the only way is to convert the drag to lift, the plane will be slower.
I hope it was understandable.

Btw the b29 is pretty DANG fast. With wep it can do 393 at 30k. Last time i tryed it, i got 4 (!!) 163s without losing a drone. I am a horrible shot and very rarely fly bombers, but they couldnt jump on me as fast as they wanted and were easy kills. Not sure about this bomber being correct.
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Offline LLogann

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Re: B-29 air speed
« Reply #29 on: July 06, 2011, 10:56:48 AM »
Very true, but the weight of the 30mm 190A8 w/ 100% is almost 10k....  500 pounds is just 500 pounds........  When we are speaking about 1/3 the overall weight however, that difference in density make it plausible even on the surface.  (without doing any thrust to weight math)

Weight alone doesn't dictate speed because it's internal.

Adding about 500lbs to the wings of a Fw190A8 with the 30mm guns package reduces speed only 1mph, from memory and comments on the forums dating back many years.


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