Does anyone have any comments or curses about Edson adjustable motor mounts [link=http://www.mecoa.com/acc/mounts/edson/edson.htm]Edson motor mount[/link]? I am thinking about setting these up on Hog Bipe that I am starting to build. I want to put a 4 stroke on it, but I may have to put a 2 stroke on it untill funds get better. They look good and I like the flexability that they offer, any complaints on them, besides the price?

Thanks

My suggestion is to get a solid aluminum mount and use it. To to many parts to come loose and cause you problems and not enought strength to stand a hard prop strike with that mount. Keep the mount simple. A one piece aluminum is best. Drill and tap the mounts to match the lugs on the engine you are going to use. A Dave Brown is another good choice. The Dubro Vibe isolation mounts are good also, I've used a number of them. The last thing you want, I'm fighting a second hand plane with these now, is mounts that can move on the firewall. If you pull the engine, getting it back in place is a chore. I had to cut a 1/8" ply window frame to fit the mount, center the mount then epoxy and screw the frame to the firewall to locate the mount. In my case, mounting the cowl and the engine was one in the same. I had to put the engine in the cowl and then position them on the plane, mount the motor mounts with engine installed to the firewall using the window frame to postion it and then screw down the cowl. Remember that you are going to have to tighten loose screws at some point, and you need to be able to get to them With the mount you are suggesting, there are to many screws to lossen up and it is going to be dificult to get every thing back the way it was at first. Simplicity is a mount from O.S, or Saito to fit your 4 stroke and it will be pre drilled and tapped for the engine. Eight screws with no nuts is the goal when mounting and engine. Four to mount the engine to the mount and four more to hold the mount to the firewall.

If you decide to go with a 2 stroke first, be aware that there are a few issues jumping to a four stroke after.

First, the motor mount will need to be a lot longer for a Four stroke. Figure at least an inch, probably more. On a four stroke, the motor mount right behind the carb is always an issue. Make sure you allow for the socket head cap screw and a washer when you place the engine on the mount. Alos, with the engine moved forward, you will have to rebalance the plane

Next is the throttle linkage. You can't use the throtle cable or push rod exit from the 2 stroke for a four stroke replacemt.

Last is the exhaust. Again there is a big difference between the two type engines.

My suggestion is that if you are planning a four stroke engine, wait until you get the engine to setup the firewall and cowl. It will save you a lot of extra work, and keep the plane nose good looking


Don