BCT your prop is clearly too close to the dirt! get some bushwheels dammit its all you are missing.

L-19 wrote:

hotrod150 wrote:Seems like I heard something about an electric (?) controllable (not constant speed) MT prop. That'd be just the ticket for my O-320-E2A.

Automatic or manual, does not list applicability to engines/airframes. Too bad they don't allow reversible on fixed wing applications, that would be perfect on a normally fixed-pitch floatplane.

http://www.mt-propeller.com/en/entw/pro_elec.htm

Sutton has an STC for a reversible MT prop on the Super Cub.


For those questioning what happens on gravel, etc....I've seen Beech 1900s routinely operated on gravel strips with VERY little prop clearance and composite props. I've talked to the maintenance guys and they say it's a non issue, as BCT noted. A little bit of epoxy in the rock chips occasionally, and done.

Also, remember that a metal prop suffers the very same sort of damage. With them, you have to be continually filing metal off (sometimes a lot) to remove those stress risers. With the MT prop, the stainless leading edge takes most of the abuse, you don't file it or do anything with it, until it is eventually due for replacement. Your propeller never gets smaller, in other words, and metal props do.
MTV

hotrod150 wrote:Seems like I heard something about an electric (?) controllable (not constant speed) MT prop. That'd be just the ticket for my O-320-E2A.

I got a ride recently in a HK36 Super Dimona motor glider. It used a MT prop with electrically-actuated pitch control. I think the engine was a 100HP Rotax, but not 100% positive.

P.s. It's a damn blast. Check it out if you ever get a chance!

That's the ticket! That'd be great for my 150-horse-- dial in flat pitch for takeoff, and coarsen it up as required for cruise. I followed the link to the MT site, got the specs on an M7 69" 3-blade & an M17 76" 2-blade, but no prices. Anybody have an idea how much they want for one of these?

Contact these guys, John Nielson is a member here, not sure what his screen name is on BCP.

www.flight-resource.com

mtv wrote:
There have NOT been any cases of "delamination" in these props that I know of. There have been some cases of VERY tiny cracks that got folks wound up. All these were repaired at no cost to the owner, other than shipping one way. And, frankly, every one of those I saw were cosmetic in nature. The company has been really good with customer service.



MTV

My shop is telling me that my prop is delaminating. Prop only has 158 hours on the blades.

Just curious, and to clarify your post. Who is your shop? Is this your local A&P? Prop shop? Or authorized MT Prop shop?

ZPilot wrote:

mtv wrote:
There have NOT been any cases of "delamination" in these props that I know of. There have been some cases of VERY tiny cracks that got folks wound up. All these were repaired at no cost to the owner, other than shipping one way. And, frankly, every one of those I saw were cosmetic in nature. The company has been really good with customer service.



MTV

My shop is telling me that my prop is delaminating. Prop only has 158 hours on the blades.

More than likely your prop is not delaminating, but the wood is trying to dry out further, which oozes sap beneath the sheath and creates blisters. MT says purely cosmetic.... But it is an MT pet peeve of mine. It has happened to me twice, and both times in under a year.
Having said all that, it still is the best prop going for my mission...

How many years old is your prop?
Can you post pictures , so we see this delamination?

First, I have no personal experience behind an MT but...

I spoke to the FR guys at the Airmen's show about these reports. (Paraphrasing in my own words) They said they were from ignorant shops/APs who didn't understand the technology.

ZPilot wrote:

mtv wrote:
There have NOT been any cases of "delamination" in these props that I know of. There have been some cases of VERY tiny cracks that got folks wound up. All these were repaired at no cost to the owner, other than shipping one way. And, frankly, every one of those I saw were cosmetic in nature. The company has been really good with customer service.



MTV

My shop is telling me that my prop is delaminating. Prop only has 158 hours on the blades.

Updates?? Have you contacted FR or MT?

MTV

RockHopper wrote:Just curious, and to clarify your post. Who is your shop? Is this your local A&P? Prop shop? Or authorized MT Prop shop?

They're doing my annual/100 hour. There is no MT prop shops on the field. However, photos were taken and emailed to MT prop, and they're the ones that recommended and overhaul. It looks like there is a MT prop shop in Puyallup, so that might help us out....

In the meantime, I don't want to drag shop names here in the thread. It is a shop, not just an individual A&P. They have a good reputation, and work on a fleet of Beavers (no, not Kenmore Air). As with their experience with MT props, it is probably limited. However, with that said, MT props diagnosed the problem after online correspondence with the shop.

Rob wrote: More than likely your prop is not delaminating, but the wood is trying to dry out further, which oozes sap beneath the sheath and creates blisters. MT says purely cosmetic.... But it is an MT pet peeve of mine. It has happened to me twice, and both times in under a year.
Having said all that, it still is the best prop going for my mission...

Thanks to this post Rob, I did ask this specific question. It was not a blistering type of issue I suppose. I don't have photos of it yet, but I hope to have them soon. As I mentioned just prior to this post, MT props said to send it in for an overhaul.

motoadve wrote:How many years old is your prop?
Can you post pictures , so we see this delamination?

They were manufactured in 2006. Purchased & Installed in 2010.
No photos yet. I hope to have some to post in a day or two.

bigrenna wrote:First, I have no personal experience behind an MT but...

I spoke to the FR guys at the Airmen's show about these reports. (Paraphrasing in my own words) They said they were from ignorant shops/APs who didn't understand the technology.

Agreed. However, online correspondence did occur between the manufacturer and the shop....

mtv wrote:
Updates?? Have you contacted FR or MT?

MTV

I just got word of the issue of this last night (Friday). I think MT is closed on weekends, no luck getting in touch with them> Thus, I won't have any updates perhaps until mid-week.

Just for the record everyone, I am not bashing MT Propeller at all. This was a thread bump to see if anyone could share any more information about alleged delamination issues...other than what has already been posted.

Perhaps the previous owner of the airplane used the airplane on gravel and did not "patch" holes with epoxy? Who knows? I am not saying it is a defective product...perhaps it could be...we'll see.

Also, the term being tossed around by parties involved is "delamination"...perhaps that's not entirely accurate...maybe it is chipping...I am not quite sure yet.

I'll get some photos up by mid week.

ZP

ZP,

Your posts didn't come across as bashing anyone. I have some small cracks in one blade of my MT prop. Emailed a couple of photos to Gerd at MT and he said its surface don't sweat it.

For what it's worth, my understanding is that most repairs of these props have to go to Florida and often to Germany for repair. The folks I've talked to who've been throughthissay it takes a whole, but that MT didn't charge them.

I hope this works out for you without much down time. Keep us posted.

MTV

Had two very small gel coat traverse "cracks". Factory said fly.

A little ticked at first because of the cosmetics but, adding up good and bad I still enjoy the propeller.

Factory new about 50hrs when discovered.

If it was made in 2006 , it should have been overhauled in 2012, MT prop you need to do that every 6 years , starting the date the prop was made.
I was told that , someone correct me if Im wrong.