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mark.bitterlich(at)navy.m
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 Posted: Thu May 31, 2007 11:16 am Post subject: MT FW-190 Blades on Tom's YAK-50 (and other aircraft) |
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READ THIS TOP TO BOTTOM, DO NOT SKIP ANYTHING
I felt the same way, so I decided to look into the issue of the FW-190
prop. I know Tom loves his and feels strongly about it, and I believe
him completely.
That said, it is also always worth knowing what is on the OTHER side of
the coin. Please read the below included message from MT carefully
regarding the MW-190 blades.
Mark Bitterlich
Roger Kemp said:
Tom Johnson has one on his. Looks pretty good. What is more impressive
is the 1600 lbs + static thrust! Tom can give the exact numbers. Too
much on my feeble brain right now to remember the exact numbers he
quoted.
Doc
BELOW FIND MY LETTER TO MT PROPELLOR AND THEIR ANSWERS: (And also read
VERY cafefully their note on Time Between Overhaul for these blades!
!!!!!!!!!!!!!
-----Ursprungliche Nachricht-----
Von: Bitterlich, Mark G CIV Det Cherry Point, MALS-14 64E
[SMTP:mark.bitterlich(at)navy.mil]
Gesendet am: Mittwoch, 9. Mai 2007 21:57
An: techsupport(at)mt-propeller.com
Cc: markbitterlich(at)earthlink.net; yakplt(at)yahoo.com
Betreff: FW-190 Blade
Sir,
I have received feedback of some tests made in the U.S. that claim that
the FW-190 blades on the MTV-9 Hub have have compared equal to and in
some cases better than the -29 blades when measured on a digital dynamic
load test, attached to a YAK-50 for testing.
Questions:
1. Do you feel it possible that the FW-190 blades could indeed compare
that well to the -29 blades in a recorded thrust test?
2. Are the FW-190 Blades available, or is there a large backlog on
orders with a resultantly longer wait time?
3. Can you give me a price comparison between an MTV-9 with the -29
blades and with the FW-190 blades?
4. Do you have any warnings or limitations when using the FW-190 blades
for aerobatics?
Any other general comments that you might offer comparing these two
products would be sincerely appreciated.
Best Regards,
Mark Bitterlich
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viperdoc(at)mindspring.co
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| Posted: Thu May 31, 2007 11:49 am Post subject: MT FW-190 Blades on Tom's YAK-50 (and other aircraft) |
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Mark,
Thanks. 200 hours TBO. Forget that!
Doc
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mark.bitterlich(at)navy.m
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| Posted: Fri Jun 01, 2007 6:32 am Post subject: MT FW-190 Blades on Tom's YAK-50 (and other aircraft) |
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The jury is still out on these blades! I have gotten more information
that I will post as soon as the author tells me it is OK to do so. In
the meantime, let me just say that there is some seriously conflicting
information out there about these blades.
Mark Bitterlich
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tjyak50
Joined: 31 May 2007
Posts: 81
Location: Phoenix, AZ
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| Posted: Fri Jun 01, 2007 8:23 am Post subject: Re: MT FW-190 Blades on Tom's YAK-50 (and other aircraft) |
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The "FW" Blade is more than just cool looking.
My first hand flight experience with this prop flying against 2 blade and other model 3 blades has been very favorable to say the least.
The following email was forwarded to me and helps to clear the waters a bit.
From: larry schlasinger
To: mark.bitterlich(at)navy.mil
Cc: John A. Nielsen ; dwayne clemens ; Bill Blackwell ; josef.eberl(at)mt-propeller.com
Sent: Thursday, May 31, 2007 4:58 PM
Subject: FW 190 Propeller
Hi Mark,
Someone forwarded me the controversy on the FW-190 propeller and since this was my original deal and I was the flight test pilot for this new propeller I thought I'd put some things to rest. I ordered the first FW190 prop at the factory after one of my meetings with the MT staff. This propeller had been requested by a customer building a replica FW190 but had never been ordered or built previous to my propeller.
I tested this first FW190 propeller on my Yak 52 as well as on my I-3, I had an MTV-9-27 on the Yak and a -29, 260 on the I-3. I wasn't expecting equal performance but I wanted the look for the Yak. I was pleasantly surprised to see that the FW190 performance in flight was nearly the same as the -29 and perhaps a bit better than the -27. Flight characteristics with the FW190 were excellent and perhaps more predictable on the YAK than the -27. We did experience a tendency to overspeed during flight testing with low power settings and made a change to the counterweight angle and internal return springs. We also added the spring to the governor we normally recommend with all MTV-9's on M14P's. This resulted in perfect performance and no problems. I fly this propeller in airshows and have done just about any maneuver the plane is capable of flying. As for the TBO, this is an experimental propeller and I was never concerned about TBO or any vibration problems. Due to the concern of some of my customers, we've scheduled a vibration test for later in June and I'm confident, as are our engineers, that the test will show what we expect. Assuming this to be true we'll extent the TBO beyond 200 hours.
If you have any questions, you can call me at 715 924 4410.
Larry Schlasinger
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yakplt(at)yahoo.com
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| Posted: Fri Jun 01, 2007 1:40 pm Post subject: MT FW-190 Blades on Tom's YAK-50 (and other aircraft) |
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Tom, I was going to ask Larry before I posted his message, but regardless, the fact is that you are correct. His message is very illuminating and explains a lot.
What I can not understand at all is why MT would not say it first. It seems that you have been right all along about this blades performance, but I do admit that I like to see test pilots weighing in with their flight experiences as well as static tests.
Mark Bitterlich
tjyak50 <tomjohnson(at)cox.net> wrote:
[quote]--> Yak-List message posted by: "tjyak50"
The "FW" Blade is more than just cool looking.
My first hand flight experience with this prop flying against 2 blade and other model 3 blades has been very favorable to say the least.
The following email was forwarded to me and helps to clear the waters a bit.
From: larry schlasinger
To: mark.bitterlich(at)navy.mil
Cc: John A. Nielsen ; dwayne clemens ; Bill Blackwell ; josef.eberl(at)mt-propeller.com
Sent: Thursday, May 31, 2007 4:58 PM
Subject: FW 190 Propeller
Hi Mark,
Someone forwarded me the controversy on the FW-190 propeller and since this was my original deal and I was the flight test pilot for this new propeller I thought I'd put some things to rest. I ordered the first FW190 prop at the factory after one of my meetings with the MT staff. This propeller had been requested by a customer building a replica FW190 but had never been ordered or built previous to my propeller.
I tested this first FW190 propeller on my Yak 52 as well as on my I-3, I had an MTV-9-27 on the Yak and a -29, 260 on the I-3. I wasn't expecting equal performance but I wanted the look for the Yak. I was pleasantly surprised to see that the FW190 performance in flight was nearly the same as the -29 and perhaps a bit better than the -27. Flight characteristics with the FW190 were excellent and perhaps more predictable on the YAK than the -27. We did experience a tendency to overspeed during flight testing with low power settings and made a change to the counterweight angle and internal return springs. We also added the spring to the governor we normally recommend with all MTV-9's on M14P's. This resulted in perfect performance and no problems. I fly this propeller in airshows and have done just about any maneuver the plane is capable of flying. As for the TBO, this is an experimental propeller and I was never concerned about TBO or any vibration problems. Due to the concern !
of some of my customers, we've scheduled a vibration test for later in June and I'm confident, as are our engineers, that the test will show what we expect. Assuming this to be true we'll extent the [quote][b]
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