whats the diffrence between an os and an os max?

Hey Manotowoc,

Not a thing. In the earlier years OS was referred to as OS MAX. Not sure of the complete history thou. There is various Web sites that have the history of OS engines and others that may have a true answer to your question. Do a search here and they should pop-up.

I take it your in the Crane Business?

Happy Fly'n.....

Here's a link that shows just about every OS engine ever made up to 1996. This is the second page but the first showing the OS Max series.
http://www.osengines.com/history/ostimeline02.html

thanks guys, found what i needed

They were named after me & they still owe me $1.00 royalty on each one they made, so next best ,all of you that have one you may each send me a dollar. Thank you all !! big max 1935

BIG MAX,

Thats a $1.57 to me. I have a cheque made out for $17.16
I will gladly calculate the interest if you give me a rate. You can send that along with your address.

Happy Fly'n....

PepeJ :Please I can not accept any more money as that would put me in another tax bracket !! I have been directing all moneys from my royalty`s be given to the nearest home for wayward engines , they also will take glow fuel & propellers. I thank you for your kindness!! >>>>>>>>>MAX