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For 3/4 x .035 wall 4130, the tube that would fit closest to the inside would be 11/16 or .680 OD.

EDMO

_{My engine definitely will sit out further from the firewall.  The drawings are definitely the firewall dimensions for a Merlin GT as the measurements line up perfectly.}

Thank you sir, its much appreciated.

  Leni,

I just sent some money your way via PayPal.  Thanks for another year of keeping this forum up and running!  

For those of you who haven't donated any money this year but want to, the details of how to send money are above in this thread.  I strongly urge those who frequent this forum to donate yearly to help Leni bear the costs of this site.  The small sum I sent Leni is nothing compared to the information I've obtained on this site.  I know I'd rather pay nothing but then again I'd rather this forum stay online.  Nothing is free.  Thanks again Leni for your time and effort! 

The PA-15/17 had th C65 as the stock motor, no electrics.

Piper PA22 Colt had a O235 Lycoming, the PA20/22 Pacer and PA16 Clipper had an O290 Lycoming, all with electrics.

I don't believe the C and the O Continental mounts will interchange without some mods. Obviously the Lycoming mounts are totally different.

Wasn't the Vagabond PA-15 equipped with the C65-8, with no starter, generator?

What about the Piper Colt? Didn't it have electric?

Does the mount for the C65-12, C75-12, C85-12, and C90-12 fit the O-200? There should be plenty of them around.

EDMO

16k seems pretty steep for a 1

My Kitfox 1 KIT, SN 134, was also sold in 1990/1991. I think we have clearly shown that this is a ONE.

EDMO

     ...So the engine mount drawing is for a Piper Vagabond with the Continental 65 horsepower engine.  Piper used lots of 1025 tubing in their steel tube structures.  They used just a few sticks of 4130 in the more highly stressed areas.  I've been told that the cost savings per airplane for doing this was about $4.00.
     That Vagabond engine mount sits pretty close to the firewall.  Are you intending to use a starter and generatior on that 0-200?

Since you can name a kit aircraft anything you want, I take the "GK-3" the plane is called with a grain of salt. It could stand for Glenn Kenneth's third kit he built.

The shape of the doors clearly makes this a model 1 Kitfox.

Yes. It's called image-engineering. They have made their bones on the system being so friendly and "green".

Please don't take our word, get copies of the MSDS (material safety data sheet) for thier products. By law these need to be available. This is where the true story is told.

Seems odd that they only recommend and show (in the videos) a charcole respirator.  Is there something out of whack here?

I have taken the advice of Ed and a few others and built new brake pedals and installed matco 4g master cylinders the question that I have is ,when I plumb the brake lines what do I use to seal up the threads that go to the adapters , thanks rusty

The drawing you posted uses 5/8" and 3/4" tubes.

Attached is a Merlin with o-200 installed.  The mount in the picture is what is on the plans. The second picture is the engine I bought out of a federal repo.

I like to keep the oil bottle full... that is one thing I never push the envelope on... if I run out of gas, I will hopefully be able to make a good landing, make the call of shame and get some gas brought to me.  If I run out of oil, that call of shame includes a new engine to be field installed as a best case scenario

1025 is the tubing piper and most other AC manufactures used 100 years ago before the 4130.  Most all tubing used now is 4130.  If the .035 wall 1025 was good enough to hold, .035 4130 will be an upgrade.  I would use .035 4130 in a heart beat and not think twice about it.

that is really close to the same tank I got Ill just make sre to take off with a couple inches of oil in the tank thanks and P.S. I like the way you worded that big tires monster gear

Im thinking 4130 also.  A Cessna 150 with a o-200 motor mount is actually smaller than 3/4 tube.  IT is very light and is 4130.

Looks like the drawing specifies 1025 steel. Most motor mounts I have heard of are 4130 though.

If its tubing its most assuredly 4130.  3/4x.035.  3/4" is the O.D., .035 is the sidewall thickness.  to figure your I.D. you can take 3/4" or .75 minus your sidewalls (.035) being .070. and you get .68.  That's your I.D.   

Sometimes you are better off to buy a standard mount for the engine, and modify the fuselage to fit it.

EDMO

o-200.  I saw a Cessna 150 mount and it is pretty light.   I am looking a engine mount plan for a o-200 in a merlin.  It does not specify whether its 4130 or the inside dia.  Just says 3/4 x 035.

Engine Mount Drawing.pdf

what engine are you putting on it?

Hi,

Is 4130 the typical tube steel used to fabricate a motor mount?  If so what should the inside diameter be if I am going with 3/4.

Thanks