Return-Path: Sender: (Marvin Kaye) To: lml Date: Fri, 15 Aug 2003 23:39:32 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m07.mx.aol.com ([64.12.136.162] verified) by logan.com (CommuniGate Pro SMTP 4.1.1) with ESMTP id 2524307 for lml@lancaironline.net; Fri, 15 Aug 2003 23:02:41 -0400 Received: from JIMRHER@aol.com by imo-m07.mx.aol.com (mail_out_v36_r1.1.) id q.15b.23195637 (18555) for ; Fri, 15 Aug 2003 23:02:38 -0400 (EDT) From: JIMRHER@aol.com X-Original-Message-ID: <15b.23195637.2c6ef8ce@aol.com> X-Original-Date: Fri, 15 Aug 2003 23:02:38 EDT Subject: [LML] Lancair IV Prop X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_15b.23195637.2c6ef8ce_boundary" X-Mailer: 8.0 for Windows sub 910 --part1_15b.23195637.2c6ef8ce_boundary Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable Hi Bill,=20 I think your information is old on the MT Propeller. The MTV-14D ****195-30a= =20 that I have on my L4P when attached to a (TS)IO-550 or 520 has a TBO of 1800= =20 hrs. per there website TBO variable propellers bulletin Feb. 10, 2003.=20 Interesting that the engine has a TBO of 1600 hrs for TSIO. I should also point out that this propeller is Certified on these engines by= =20 the FAA on the Malibu and other planes. This is the email form MT to me: It is correct, that the MTV-14-( )/195-30a is FAA certified with different=20 hubs on the Piper Malibu/Mirage. However, the STC is not ours, it is=20 owned by VK-Aircraft in St.Petersburg. The STC-No. is SA-01654-AT for the=20 MIrage and SA-01542-AT for the Malibu with TSIO-520 and TSIO-550 engines. The Propeller itself has FAA certification with TC/TCDS P3BO, hence is in=20 compliance with FAR23.905 and we have also vibration approval for the TSIO-5= 50 in the Lacair IV-P, so we are in compliance with FAR23.907. Please let me=20 have your fax number and we can send you the statement. Hope, this will help= to=20 eliminate the fly-off time because it is an approved combination. Best regards Gerd R. Muehlbauer President MT-Propeller Entwicklung GmbH I was able to show this 19 months ago for my fight test and only had to meet= =20 the 25 hrs rule for Certified engine/prop. combos. Usually, the 4 bladed prop is at least 1 inch less in dia. than a 3 blade,=20 giving it lower tip speeds. And some theories show that the pressure wave of= one=20 blade works better while following another blade more closely and the=20 pressure is less per blade. That is why some feel the smaller dia. 4 blade i= s the=20 same performance or better than a longer 3 blade. But we all know that ONE b= lade=20 is the best. I was told that same false information before I looked into it. Best of Luck getting back into the air soon,=20 Jim Hergert N6XE, "An Sex Y" L4P 4 Blades and Wingtits I have no experience with props.=A0=A0 I know that as you add engine H.P., y= ou=20 should increase the blade diameter to utilize the extra power.=A0 The limiti= ng=20 factor then becomes ground clearance for the blade tips.=A0 The compromise i= s to=20 add blades.=A0=A0 I know that Don Goetz used the first 4-blade prop on his L= ancair=20 IV but I think that he wanted his machine to look different.=A0 I asked him=20= if he=20 could quantify the differences between 3 and 4 blades on the same engine but= =20 he=A0 suddenly found something else to do. The only differences between MT and Hartzell that I am aware of, is that the= =20 MT is a composite prop and requires a 400 hour overhaul instead of 500 for t= he=20 Hartzell metal prop.=A0 I suspect that the MT might be a little cheaper,=20 however I dont think that a 4-blade prop has ever been certified on the L-IV= by the=20 factory.=A0 This means that you would require a 40 hour test program instead= of=20 25 hours.=20 Regards, Bill Hogarty =20 --part1_15b.23195637.2c6ef8ce_boundary Content-Type: text/html; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable Hi Bill,

I think your information is old on the MT Propeller. The MTV-14D ****195-30a= that I have on my L4P when attached to a (TS)IO-550 or 520 has a TBO of 180= 0 hrs. per there website TBO variable propellers bulletin Feb. 10, 2003. Int= eresting that the engine has a TBO of 1600 hrs for TSIO.

I should also point out that this propeller is Certified on these engines by= the FAA on the Malibu and other planes. This is the email form MT to me:
It is correct, that the MTV-= 14-( )/195-30a is FAA certified with different hubs on the Piper Malibu/Mira= ge. However, the STC is not ours, it is
owned by VK-Aircraft in St.Petersburg. The STC-No. is SA-01654-AT for the MI= rage and SA-01542-AT for the Malibu with TSIO-520 and TSIO-550 engines.

The Propeller itself has FAA certification with TC/TCDS P3BO, hence is in co= mpliance with FAR23.905 and we have also vibration approval for the TSIO-550=
in the Lacair IV-P, so we are in compliance with FAR23.907. Please let me ha= ve your fax number and we can send you the statement. Hope, this will help t= o eliminate the fly-off time because it is an approved combination.

Best regards
Gerd R. Muehlbauer
President
MT-Propeller Entwicklung GmbH

I was able to show this 19 months ago for my fight test and only had to meet= the 25 hrs rule for Certified engine/prop. combos.

Usually, the 4 bladed prop is at least 1 inch less in dia. than a 3 blade, g= iving it lower tip speeds. And some theories show that the pressure wave of=20= one blade works better while following another blade more closely and the pr= essure is less per blade. That is why some feel the smaller dia. 4 blade is=20= the same performance or better than a longer 3 blade. But we all know that O= NE blade is the best.

I was told that same false information before I looked into it.

Best of Luck getting back into the air soon,

Jim Hergert
N6XE, "An Sex Y" L4P
4 Blades and Wingtits

I have no experience with p= rops.=A0=A0 I know that as you add engine H.P., you should increase the blad= e diameter to utilize the extra power.=A0 The limiting factor then becomes g= round clearance for the blade tips.=A0 The compromise is to add blades.=A0= =A0 I know that Don Goetz used the first 4-blade prop on his Lancair IV but=20= I think that he wanted his machine to look different.=A0 I asked him if he c= ould quantify the differences between 3 and 4 blades on the same engine but=20= he=A0 suddenly found something else to do.

The only differences between MT and Hartzell that I am aware of, is that the= MT is a composite prop and requires a 400 hour overhaul instead of 500 for=20= the Hartzell metal prop.=A0 I suspect that the MT might be a little cheaper,= however I dont think that a 4-blade prop has ever been certified on the L-I= V by the factory.=A0 This means that you would require a 40 hour test progra= m instead of 25 hours.

Regards, Bill Hogarty




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