access-air
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Swapping Propellers (Dowty Rotol)

Thu Sep 07, 2006 1:10 am

Okay all the Fokker F.27, Rolls Royce Dart and Dowty Rotol Propeller experts, I have question for you all....

This is regarding the Fokker F.27-MK 500 series and its American License built equivelant the Fairchild Hiller FH-227.
My question is:
Can the same propeller that was standard on the Fairchild Hiller FH-227 which is 12 feet 6 inches in diameter (Pointy End) and fitted in place of the factory installed 11 feet 6 inch (Square Tipped) props that apparently improved performace, could this same 12 foot 5 inch foot prop have been retrofitted to the Fokker F.27 MK 500 series to also improve performance?
Could this be done to any surviving Fokker F.27-500s??

In the end of Fairchild F-27 production, the 11 foot 6 inch props on the Fairchild F-27J model were replaced with the 12 foot 6 inch prop to make the higher performance F-27M for high altitude operations by Lloyd Aereo Boliviano.

So back to my question, could present day operators get any better performance out of their Fokker F.27-500s with such a retrofit?

Many thanks!!

Access-Air
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access-air
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RE: Swapping Propellers (Dowty Rotol)

Thu Sep 07, 2006 6:32 am

What?!?!? 47 look-sees and no one can help me on this???
"Heavy sigh......"

Access-Air
Remember, Wherever you go, there you are!!!!
 
Dougloid
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RE: Swapping Propellers (Dowty Rotol)

Thu Sep 07, 2006 7:06 am

I've not worked on an F27 but I have worked on a lot of Garretts and they used Hartzells, McCauleys and Dowty Rotols.

There's no changing a -XX prop from a -YY engine to a -ZZ engine unless it is specifically provided for in the manual or via a service bulletin or someone went and got an STC for it somewhere, even if it's identical.

From what you've written it sounds like the Fairchild people might have gone and done the legwork, but that doesn't necessarily mean that the prop would be suitable on the Dutch made F27 or applicable to it.

Simple, huh?
If you believe in coincidence, you haven't looked close enough-Joe Leaphorn
 
411A
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RE: Swapping Propellers (Dowty Rotol)

Thu Sep 07, 2006 3:41 pm

Standby for news...this might take just a bit of research, as I have extensive experience on both types.

Back sooner than I thought.
The short answer is NO, the larger diameter propellors were NOT approved for the F.27 Mark 500 aircraft, ONLY the FH227.

With the larger props on the FH227B (as an example) the elevators needed to be modified at the trailing edge, when the larger propes were fitted.
This mod increased the MTOW and Vmo from 223 to 250 KIAS.
The mod was not available on the Fokker aircraft, except for original build machines that were noted.

[Edited 2006-09-07 08:57:36]

[Edited 2006-09-07 09:02:39]
 
access-air
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RE: Swapping Propellers (Dowty Rotol)

Thu Sep 07, 2006 11:33 pm

Hmmm, thats too bad. I wonder if the larger props would have helped the Mk 500 perform any better?
I always wondered why Fokker never did equip the MK 500 with them but Fairchild Hiller felt that they needed to for their FH-227.
Myself I prefer the larger Pointy props to the square tipped props...
Where did you find this information 411A???
I have a website on the FH-227 and have studied this aircraft extensively and I have never heard anything about this....
Thanks!!

Access-Air
Remember, Wherever you go, there you are!!!!
 
411A
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RE: Swapping Propellers (Dowty Rotol)

Fri Sep 08, 2006 12:31 am

Go to the FAA website, Access-Air www.faa.gov and follow the links to the type certificate data sheets (TCDS).
You will find the F.27 data under the title Fokker Services, and it will indicate the specific types of propellers allowed.

Keep in mind that it may not be possible to change even if it was originally allowed, as modification kits were normally required for the elevators, to prevent possible flutter with the larger props.
The source availability of these kits may now be in question.
 
access-air
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RE: Swapping Propellers (Dowty Rotol)

Fri Sep 08, 2006 3:07 am

411A...

Interesting, I went to the site to have a look-see and I see what you mean. Its more than just swapping propellers. I find it interesting that there are that many subtle differences that can make such a difference....
I appreciate the help with that....
I'll study that further when I get home...

Access-Air
Remember, Wherever you go, there you are!!!!

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