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Four Bladed Props

Started by KJ_Lesnick, June 17, 2015, 08:18:10 PM

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KJ_Lesnick

June 17, 2015, 08:18:10 PM
When did those first appear on US and British airplanes with useful effect
That being said, I'd like to remind everybody in a manner reminiscent of the SNL bit on Julian Assange, that no matter how I die: It was murder (even if there was a suicide note or a video of me peacefully dying in my sleep); should I be framed for a criminal offense or disappear, you know to blame.

Captain Canada

#1
June 17, 2015, 09:03:38 PM
...right after the 3-bladed.

:thumbsup:
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jcf

#2
June 17, 2015, 10:07:53 PM

JayBee

#3
June 18, 2015, 02:22:36 AM
Nah. There were four bladers in WW1, well before three bladers came along.
Alle kunst ist umsunst wenn ein engel auf das zundloch brunzt!!

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Cats are not real. 
They are just physical manifestations of collisions between enigma & conundrum particles.

Any aircraft can be improved by giving it a SHARKMOUTH!

Gondor

#4
June 18, 2015, 02:51:15 AM
Quote from: JayBee on June 18, 2015, 02:22:36 AM
Nah. There were four bladers in WW1, well before three bladers came along.

There were two different types of four bladed propellers used. The first was to use two two bladed propellers with the second at 90o to the other blades and there was four bladed propellers made as one piece as manufacturing techniques improved but WWI was when they were first used. Sorry but I don't thing anyone can give you exact time and date or who it was, you will have to find that for yourself.

Gondor
My Ability to Imagine is only exceeded by my Imagined Abilities

Gondor's Modelling Rule Number Three: Everything will fit perfectly untill you apply glue...

I know it's in a book I have around here somewhere....

jcf

#5
June 18, 2015, 10:19:54 AM
If one wants to be pedantic, four-blade propellers predate WWI.  ;)

KJ_Lesnick

#6
June 18, 2015, 05:38:47 PM
Captain Canada

Quote...right after the 3-bladed.
Well, I could have told you that: I was kind of thinking more like, when was the USAAF first able to make versions that could produce good net-thrust without excess drag.  The P-47C seems to be the first...
That being said, I'd like to remind everybody in a manner reminiscent of the SNL bit on Julian Assange, that no matter how I die: It was murder (even if there was a suicide note or a video of me peacefully dying in my sleep); should I be framed for a criminal offense or disappear, you know to blame.

rickshaw

#7
June 18, 2015, 07:38:13 PM
Are you referring to fixed bladed propellers or variable angled ones?    :banghead:
How to reduce carbon emissions - Tip #1 - Walk to the Bar for drinks.

jcf

#8
June 18, 2015, 10:34:16 PM
The USAAF didn't make propellers.

PR19_Kit

#9
June 19, 2015, 12:53:26 AM
I'm not sure that a propeller 'makes drag' unless it's not rotating.

By definition it 'propels' the air backward (usually...) so the air can't produce a drag force as it's being moved past the blades, no matter how many there are.
Kit's Rule 1 ) Any aircraft can be improved by fitting longer wings, and/or a longer fuselage
Kit's Rule 2) The backstory can always be changed to suit the model

...and I'm not a closeted 'Take That' fan, I'm a REAL fan! :)

Regards
Kit

Gondor

#10
June 19, 2015, 03:01:44 AM
Quote from: KJ_Lesnick on June 18, 2015, 05:38:47 PM
Captain Canada

Quote...right after the 3-bladed.
Well, I could have told you that: I was kind of thinking more like, when was the USAAF first able to make versions that could produce good net-thrust without excess drag.  The P-47C seems to be the first...

You mean the USAAC not the USAAF and if you could not tell that Captain Canada was making a joke then you need a sense of humour!

Gondor
My Ability to Imagine is only exceeded by my Imagined Abilities

Gondor's Modelling Rule Number Three: Everything will fit perfectly untill you apply glue...

I know it's in a book I have around here somewhere....

KJ_Lesnick

#11
June 19, 2015, 03:21:21 AM Last Edit: June 19, 2015, 07:19:11 PM by KJ_Lesnick
rickshaw

QuoteYes
That's correct
That being said, I'd like to remind everybody in a manner reminiscent of the SNL bit on Julian Assange, that no matter how I die: It was murder (even if there was a suicide note or a video of me peacefully dying in my sleep); should I be framed for a criminal offense or disappear, you know to blame.

rickshaw

#12
June 19, 2015, 03:55:18 AM
Quote from: KJ_Lesnick on June 19, 2015, 03:21:21 AM
rickshaw

QuoteAre you referring to fixed bladed propellers or variable angled ones?    :banghead:
You mean variable pitch?

Yes.
How to reduce carbon emissions - Tip #1 - Walk to the Bar for drinks.

NARSES2

#13
June 19, 2015, 07:10:26 AM
Quote from: joncarrfarrelly on June 18, 2015, 10:34:16 PM
The USAAF didn't make propellers.

Can you clear something up for me Jon ? From what I've read the US Air Force (USAAC/USAAF) would order an aircraft from the manufacturer and then order the propellers separately from their manufacturer ? Is that correct or have I just miss-understood a couple of books ? Not sure if the USN differed in its practice ? Always seemed strange to me but I'd like to confirm or otherwise.
Do not condemn the judgement of another because it differs from your own. You may both be wrong.

jcf

#14
June 19, 2015, 11:15:30 AM
The engines, propellers, guns, radios etc. were BFE (buyer furnished equipment) that the customer
(War Department, Dept. of the Navy) supplied to the airframe manufacturer. So these items would
be contracted directly from the individual component manufacturers.

This is still true today e.g. on a commercial aircraft the engines, seats, galleys, lavs etc., are all technically BFE.
The airframer makes provisions in the base design for a variety of options, and prefers that customers
pick standard options, but the reality is that there is still a lot of custom work.  ;)
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