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-   -   Flottrop Prop I.D. (http://woodenpropeller.com/forumvB/showthread.php?t=445)

jwklv1 11-19-2007 01:21 PM

Flottrop Prop I.D.
Hi I have a Flottorp Armor coated Prop it is 72 inch's long the only numbers I can find on it are 11892 and under that is the number 48. Also could be 11092 and under that a number 40. These numbers are on the hub should I be looking anywhere else? I looked on the internet and could find nothing any info will be a big help. Thanks John

MWP_Lamar 11-19-2007 03:16 PM

I don't have any documentation on either sets of those numbers. The only Flottorp info I have is at http://www.modernwoodenpropellers.com/flottorp.htm.


jwklv1 11-19-2007 07:09 PM

Thanks for you time and effort. With such few numbers is there anyway to tell the year of the propeller? What years were the Armor coated Propellers made? The one I have is silver colored with Yellow tips with the back of it painted Black. When did Flottorp go out of bussinessThanks again John

MWP_Lamar 11-20-2007 11:37 AM

The only company whose records survived and are available to determine date of manufacture is Sensenich. Even if you had an identifiable design number I couldn't give you the manufacture date.

Unfortunately I have no idea what years Flottorp made armor coated props and I have no good idea when they ceased manufacture.


bhunt 11-29-2007 12:42 PM

Flottorp Prop ID
I'll do a search for you. I have just aquired most of the Flottorp Wood propeller Type Certificates and have also aquired the Beech Roby Type Certificates. I have 400 plus drawing and three or for boxes of records.
It may take me a while but I'll see what I can find from the two number you listed. The armor (plastic) coating on the propellers make it dificult to read the numbers after the coating has worn a bit. This plastic coating is no longer available as it is not environmental friendly and is nearly impossible to find the identical composition. It burns very hot and very quickly.

Joe A 03-29-2010 01:02 PM


Did you ever come up with any info on this? Know that this is an old thread but not much info on these.

I have found a "armor coated" Flottorp prop that is in good condition. Its a 74CD50 model for an Aeronca Sedan.

Problem is that its showing some age in areas that concern me. One tip has a line in the paint (and assume the coating under the paint) that runs from the edge of the tip to somewhere towards the hub.

Am guessing that its following a glue line in the wood and if thats the case then my personal feeling is that the coating needs to be removed and check for de-lamination of the wood. I am an A&P but not extremely experienced in wood props, especially the armor coated versions.

Does anyone repair armor coated props these days? Assume that Sensenich will still do a Flottorp but never asked them about the armor coated ones. Can the armor coating be removed and leave the prop varnished?



MWP_Lamar 03-29-2010 02:45 PM

Bob, do you have any additional information I can use on my Flottorp web page?


Joe A 03-29-2010 03:13 PM


I talked with the people at Sensenich Wooden props and while really nice, they said that they cannot do anything to any prop other than a Sensenich. Their repair station certificate does not allow it.

We talked about "Wings of History" museum over on the left coast. They have their own "in house" prop shop and he said that they might be able to overhaul a normal wooden Flottorp prop but had no ideas on a "armor coated" version. I called them and they are open only on Tuesdays and Thursdays so no info today.


Dave 03-29-2010 03:42 PM

Joe, I'm just guessing that the ability to take a non-airworthy prop and make it airworthy is prohibitive, and that simply buying a new one makes more sense. Rembember, if you have one in good visible condition but not airworthy, you can usually sell it as a display prop and at least get something towards the purchase of a newly manufactured one.

Dwight 03-29-2010 04:20 PM

Wings of History
I've had several propellers inspected and repaired by the propeller shop at Wings of History Air Museum in San Martin, CA. Seven of them are pictured on the "Just Showing Off" page on this web site; one of the Flottorp is the "armor-coated" design. I've sent every one of the propellers I've ever considered purchasing to W.O.H. and I believe they give me their honest opinion about the propeller's condition. They've rejected several. I've met Guy and Herb and trust them implicitly.

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