Props, concluded - P 47-sweptback-blades.jpg (1/1)

[Mitchell Holman[_9_]]

[D. St-Sanvain]

8-o

With so many lovers of the Jug around me, and some books on my shelves,
too, I discover !

--
D(e l'aviation, rien que de l'aviation) 520
Site et chat : http://d520.online.fr
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Tagazous :
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[Miloch]

In article >, Mitchell Holman
says...
>
>
>

Can't seem to find anything on this with its three sweptback-blades...anyone got
any info?



go Warriors!
*

[Bob (not my real pseudonym)[_2_]]

On 29 Oct 2017 16:15:38 -0700, Miloch >
wrote:

>In article >, Mitchell Holman
>says...
>>
>>
>>
>
>Can't seem to find anything on this with its three sweptback-blades...anyone got
>any info?

https://en.wikipedia.org/wiki/Herbert_O._Fisher
....about halfway down the page:

Early tests with transonic compressibility.

"The desire to develop a propeller that maintained its efficiency at
transonic and supersonic speeds led the Curtiss-Wright Propeller
Division to design and test several different concepts, including a
thin, cuffed four-blade and a three-bladed "scimitar" design.
Utilizing a specially modified P-47D-30-RE on loan from the USAAF,[N
6] Fisher undertook over 100 high Mach number precision dives from
38,000 ft (11,582 m) at speeds from 500 mph (800 km/h) to 590 mph (950
km/h).[N 7] The typical flight began above 35,000 ft (10,668 m) when
Fisher would push over into a steep dive, allowing his airspeed to
build beyond 560 mph (900 km/h) (true airspeed).[21] He would then
execute a pullout at 18,000 ft (5,486 m), having to maintain an
exacting set altitude within plus or minus five ft.[9]"

[Miloch]

In article >, not my real pseudonym
says...
>
>On 29 Oct 2017 16:15:38 -0700, Miloch >
>wrote:
>
>>In article >, Mitchell Holman
>>says...
>>>
>>>
>>>
>>
>>Can't seem to find anything on this with its three sweptback-blades...anyone got
>>any info?
>
>https://en.wikipedia.org/wiki/Herbert_O._Fisher
>...about halfway down the page:
>
>Early tests with transonic compressibility.
>
>"The desire to develop a propeller that maintained its efficiency at
>transonic and supersonic speeds led the Curtiss-Wright Propeller
>Division to design and test several different concepts, including a
>thin, cuffed four-blade and a three-bladed "scimitar" design.
>Utilizing a specially modified P-47D-30-RE on loan from the USAAF,[N
>6] Fisher undertook over 100 high Mach number precision dives from
>38,000 ft (11,582 m) at speeds from 500 mph (800 km/h) to 590 mph (950
>km/h).[N 7] The typical flight began above 35,000 ft (10,668 m) when
>Fisher would push over into a steep dive, allowing his airspeed to
>build beyond 560 mph (900 km/h) (true airspeed).[21] He would then
>execute a pullout at 18,000 ft (5,486 m), having to maintain an
>exacting set altitude within plus or minus five ft.[9]"
>

thanks



*