Do you know your history? (Part XXII)
- Thread starter ctab5060X
- Start date
ctab5060X
Well-Known Member
Now... which one?
OhioStatePilot
Well-Known Member
Heh, I must have posted right before you, because I saw what you stuck in there before you edited it. I was goin, "Hey!!!!! I know that's right!" 
anic:
anic:
ctab5060X
Well-Known Member
Heh, I must have posted right before you, because I saw what you stuck in there before you edited it. I was goin, "Hey!!!!! I know that's right!"
You did... quick edit on my part...
OhioStatePilot
Well-Known Member
His first variable pitch prop was a two position variable which Hamilton Standard produced while he continued work on the hydraulic constant speed.
OhioStatePilot
Well-Known Member
Actually, he designed 4:
1) Metal prop with separate hub and blades.
2) Ground Adjustable variable pitch prop.
3) Hydraulically controlled 2-position prop.
4) Hydraulically controlled constant-speed variable pitch prop.
I want my cookie now!
1) Metal prop with separate hub and blades.
2) Ground Adjustable variable pitch prop.
3) Hydraulically controlled 2-position prop.
4) Hydraulically controlled constant-speed variable pitch prop.
I want my cookie now!
ctab5060X
Well-Known Member
Actually, he designed 4:
1) Metal prop with separate hub and blades.
2) Ground Adjustable variable pitch prop.
3) Hydraulically controlled 2-position prop.
4) Hydraulically controlled constant-speed variable pitch prop.
I want my cookie now!
Actually number 1 and 2 are the same. The ground adjustable (like on the Ryan NYP) were metal props with separate hubs and blades. Although they were "variable pitch" they acted like a "fixed pitch" prop.
The hydrulically controlled 2-position prop had setting for takeoff and cruise. It was used on early aircraft like the Boeing 247 and the DC-2, thus enabling maximum performance from these new types.
I'll let you do the digging on number 4...
OhioStatePilot
Well-Known Member
Hey! According to "Wings" by Tom D. Crouch, 1 and 2 are independant!
Now the variable pitch prop won the Collier for Hamilton Standard and Frank Caldwell, the Chief Engineer in 1933.
Oh by the way, the Boeing 247D used a hydromatic variable pitch propeller and I believe was the first airframe it was used on.
Now the variable pitch prop won the Collier for Hamilton Standard and Frank Caldwell, the Chief Engineer in 1933.
Oh by the way, the Boeing 247D used a hydromatic variable pitch propeller and I believe was the first airframe it was used on.
ctab5060X
Well-Known Member
The metal hub with separate hubs and blades was a ground adjustable variable pitch prop. Some indivdual authors might separate them out, but the AIAA considers them one.
OhioStatePilot
Well-Known Member
Yeah, I agree with you on that... I just wanted to fight my point!
WacoFan
Bigly
You don't see anyground adjustables anymore - but it would be neat if they had Ground adjustable props for little planes so you didn't have to choose between climb or cruise. Curtiss Reed's are generally the prop of choice for most Waco's (not the higher HP ones). My Grandpa had a 102" G.A. Ham Standard on his YPF (275 Jacobs) and it was great. Wanted a Curtiss Reed, but couldn't find one any longer than 99". The Ham Standard worked great.
ctab5060X
Well-Known Member
Waco, got some questions to ask you about Ham Standards on the Wacos. Running out the door now going to work, look for a PM or two later.
WacoFan
Bigly
Shoot 'em away. I will tell you this - I am the DUMBEST guy on the Waco Forum of the NWC - so anything you ask I am going to verify there!
WacoFan
Bigly
If it's ground adjustable, don't you have to choose before you fly???
I mis-articulated. Instead of choosing a "climb" prop, or a "cruise" prop to purchase is what I meant. With a GA you could decide. I didn't write clearly.
OhioStatePilot
Well-Known Member
And I can see your the point you brought up as well, just don't agree with it...
Now, what contribution did the last design have on aviation...
Other than making this a widely known sight...
Well, it made a huge leap forwards in aircraft performance. Better climb, better cruise, lower fuel consumption. It was one of the design elements that made the DC-3 such a spectacular success and it played an enormous role in WWII aircraft and their capabilities. Not to mention that the hydraulic, constant-speed, variable-pitch prop is still the performance prop design in use today.
That makes sense, thanks.