dvs1

Sweet, got one.

Ok, this ones pretty easy, name this plane:

Thunderbolt47

My Feedback: (8)

Guessing, Blomm & Voss 141?

MerlinII

Focke Wulf 189 UHU (a twin engined german observer aircraft)

dvs1

You got it Merlin, your up.

The Focke Wulf 189 it is. To my knowledge only one of these still exist today!

MerlinII

Here we go:

-Early P-47 thunderbolts were re-fitted with other types of propellers during WWII, the standard 12’ Curtiss was commonly replaced by the 13’ paddle blade Curtiss prop. Beside this the Hamilton prop or the 13’ asymmetric Curtiss prop was also fitted on the later versions of the thunderbolt.

A) What is the main reason for this?

-Here is an example of the paddle bladed Curtiss prop on a P-47D-10-RE.

B) At the base of the propeller blades there is an easily distinguishable different shape. How are those named and what is the reason for this or what role are those shapes playing?

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glasscock

De-ice boots.

masteromodels

My Feedback: (11)

The paddle blade along with water injection offered better climbing ability.

MerlinII

maesteromodels, you got question A) right, indeed to improve performance, especially the rate of climb.

Now for B) looking for the typical name for those special shape on the propeller blades ?

Now glasscock is close on B), de-icing boots, but it played an aerodynamic role also.

Looking for the typical name of those shape

jharkin

My Feedback: (2)

Were they called prop cuffs (same as on Mustangs)?

masteromodels

My Feedback: (11)

they were called cuffed propellers.

ram3500-RCU

My Feedback: (221)

The P-47 was actually fitted or retrofitted with (4) different props during the war, the largest being 13' 1 7/8". The thin air at higher altitude required the wider blades of the later props, to gather more volume of air, for the more powerful engines to make use of all that power. Even earlier versions were retrofitted with some of these wider blade props like the Curtis electric symmetrical, or asymmetrical paddle-blade prop. The 'cuffs' at the base of the blades were installed to eliminate regions for ice entrapment or build-up.

The Hamilton Standard Hydromatic prop was cuffless but had the wide blades that came to be referred to as 'paddle' blades. It was the largest diameter used at 13' 1 7/8".

MerlinII

well we can only have one winner ;-) here and based on your 2 correct answers its your turn maestromodels,

thanks jharkin also and ram3500-rcu for your very accurate info

merlinII

masteromodels

My Feedback: (11)

I have to bail out for a while , let one of the other fellows pick it up.

thanks bob

proptop

My Feedback: (8)

The prop cuffs also helped in cooling the engine...
According to my 2nd phase (engines ) teacher at Riverside School of Aeronautics, Mr. Hamm, who was a P-47 crew chief in England during the war.

He was a very interesting guy, who joined the Army Air Corps in 1933, and started his career working on B-9's and B-10's.
By the time the war was over, he was working on some of the first operational P-80's...

ram3500-RCU

My Feedback: (221)

I thought this would be a reason as well, but the Hamilton Standard cuffless props were used starting on many of the D models. I would have thought if this was an issue, only cuffed props would have been used by then.

proptop

My Feedback: (8)

True, the Hamilton Standard props didn't have them. I'm just recalling what he told us in class...the later model '47's had improved engines.
There were lots of changes being made, pretty much a constant evolution...development of new engines, cooling baffle design, slight cowl modifications too.

Cuffs were also on B-50's props used on the 4360's. (one of my flying buddies was on a B-50 from 1950 to '52 ) Cooling was only part of the reason for using them. I believe the early P-47 props were Curtiss electric props? So were the B-50's...so perhaps it was a Curtiss design thing that wasn't required when using the H-S props? Unfortunately Mr. Hamm has long since passed, so I can't ask him.

The cuffs helped move more air right near the hub.

ram3500-RCU

My Feedback: (221)

So who's up? Ready for another one.[8D]

jharkin

My Feedback: (2)

If Merlin doesn't drop in to give us a ruling, Id guess that you are up ram3500.....

ram3500-RCU

My Feedback: (221)

OK, I'll give it a whirl.

During pilot training on the P-38, when going through the single engine operation and landing phase, why was the right engine always shut down and feathered and not the left?

on_your_six

My Feedback: (11)

Because the generator was on the left engine... no engine, no electrical power.

ram3500-RCU

My Feedback: (221)

Wow, you guys are good. That is exactly right. It was thought to be an unnecessary risk to run on only batteries during the training, which would be the case with the left engine dead.

I'll try and do better next time.

Guess your up.

on_your_six

My Feedback: (11)

OK sorry to hold things up!! Not really difficult

How many wheels on the main gear of the SR-71 per leg? What is unique about the tires? and why?

This is three parts and you need to answer all three parts.

masteromodels

My Feedback: (11)

I think they had 3 wheels for each main strut and the tires were filled with nitrogen and the tires impregnated with aluminum to with stand the heat
No SR-71 was ever shot down from an enemy missle.

on_your_six

My Feedback: (11)

So right you are... I saw one last Saturday... great bird, leakiest wings ever on the ground... fuel was hard to burn and required two hemi engines on a start cart.... the hemi engines were blown after 10 starts...

So continue on Mastermodels... what is your question?

masteromodels

My Feedback: (11)

This is my last question. Can anyone name the plane the germans used for the first time glider-borne troops were used in a military operation.and who designed it. since this is my last turn I thought I would make it a little harder.