I've been trying for quite some time to purchase engine mounts of this style. With the help of fellow flyers, I was able to receive a mount to use my engines on 1/2 A combat planes. These engines have a radial mount so these beams are required to take you straight from the noseblock to the radial portion of the engine mount. Working with some input from other 1/2 A enthusiasts, we decided on a slotted single bolt hole retention. The mounts are milled to accept a 4-40 locknut while the holes on the radial are 2-56 threads. The mount itself is 6061 T-6 aluminum. The fellow who has already made me some of these mounts was asking if there were others interested,. These are machined on a computerized mill. I've posted some pictures to see the size which is 1 1/4" long with an inside dimension of 3/4". These mounts are currently available on Ebay on a Buy It Now auction. http://www.ebay.com/itm/Profi-049-8cc-and-1cc-Engine-Mount-for-1-2A-Combat-Freeflight-and-Racing?item=260988404855&cmd=ViewItem&_trksid=p5197.m7&_trkparms=algo%3DLVI%26itu%3DUCI%26otn%3D5%26po%3DLVI%26ps%3D63%26clkid%3D7249152883386213578 









ken

                 Just for the record Chris, this was the first time I ever did a project like this. Working via the internet is great for speed but quite difficult to convey from a dimensional standpoint. I had made some sketches and pictures. Yes, They're proudly made in USA! Ken

          Al, I do understand. The reasoning for the milled slot was for slight cg adjustments. The reasoning behind the single bolt hole was that it could possibly provide some resistance to prop breakage. As it was explained to me it could also prevent the rear bearing from popping out in a hard nose dive which could damage several internals including the case. Once the desired position of the mount has been achieved, drilling a through hole shouldn't be a difficult task if desired. I found on one of my planes I used the mount on, I used two small pieces of sandpaper glued back to back under the beams. This worked quite well. Ken