They are hard to put on the firewall; at least for me. My GP Cheokee came with one and I think I'm just gonna get the nonajustable type. Has anyone have trouble with these?

I really like the GP adjustable mounts. In fact, I prefer them to most other mounts that I have used.

Here's how I install them:
-Put the two halves together (not on the plane) then adjust it to the correct width for the engine and tack the halves together with medium CA.
-Bolt the mount to the firewall
-Place the engine on the mount and determine the correct distance from the firewall and hold it there with a spring clamp or two.
-Mark the location for the engine mounting holes. The great planes dead center tool works great for this.
-Remove the engine then remove the mount from the plane.
-Drill the engine mounting holes in the mount using the proper size bit and tap the threads.
-Install the mount on the plane for the final time using blue loctite on the screws along with a flat and a lock washer.
-Bolt the engine onto the mount using the holes that were just drilled & tapped. Be sure to use a flat and a lock washer here.

If you take your time and work accurately it will come out perfect and be hassle free.

i bought a gp one that was for something like 25-47 sized engines. but it didnt fit my gms .47 that ticked me off a bit, but i managed to mod it a little (drill new holes on the mount) and make it work
i got another with a kit i bought (gp rapture) gp 40-70. it worked great for a gms .47

I've used a ton of these mounts, and like Chuck I've come to like them. They are a but cumbersome at first, but once you get the hang of using them they're easy to use and setup. What I do for marking where to mount them is to use clamps to clamp the mount to the engine you are mounting. This will ensure you have the proper spacing for your engine as you mark the firewall for your locaiton.

Ken

Since this is a GP ARF, the blind nuts are pre-installed in the firewall making a simple installation. If you ever buy a GP mount separately to put on another plane, it comes with a nice drilling template. Just line the template center lines up with your firewall lines and mark the blind nut locations. They are really user-friendly

One thing I've found in this hobby is that things seem to get easier the longer you are in it. My work is a lot more accurate than it was a few years ago and what was once frustrating, I've now gotten good with and come to appreciate. Just be patient and keep at it at it.

Thinking about enginemounts kind of makes me laugh at myself. I have this great 3D drafting software on my work PC and one day I decided that I was going to make the perfect glow engine mount. I did various designs and tweaked different things over a few weeks in my spare time. Know what I ended up with? A mount that was almost identical to GP except for a few minor differences. Needless to say I decide there was no need to reinvent that particular wheel.

The GP adjustable mounts are the only ones I buy

I havnt thought of locking in the width with the CA, I would always try to hold them, they always move on me, thats a great tip. I like the GP adjustables also, thats all I get. I also like them because the arms are longer than most. I can get the engine out farther for balancing and theres more room for remote neadle valve

I'm mostly a four stroke man and I like the fact the these mounts are long. For a two stroke I usually saw them off to proper length

I guess I'm just tired. Tomorrow I'll go at it again. What I'm trying to do is, put a larger engine on my trainer. When I tired to put the mag 46 on after I took the O.S. off, I found it was a tad to small. I took all the screw out and widened out the mount. Everytime I try to put the mount back on the firewall; the mount gets smaller.[:@] I will try to put some CA to hold it in place. I think I'll go to the hardware store and pick up some wood to make a new wall. The plane I'm trying to put the mount on is a spad Debonair. I don't know how we got it on there the first place.. The mount was given to me and so it don't come with a template of any kind.

Trying to use one of the humongous adjustables on a gutterpipe spad is indeed difficult and a far better and easier mount to use is a Dave Brown. They are consistantly more versatile in tight situations.

http://www3.towerhobbies.com/cgi-bin...?&I=LXB874&P=7

John

i didnt like the GP mounts either at the beginning,

now i would say about GP adjustable mounts they are not the cream de la cream but not the bottom of the barrel either.

its easier to mount them, the two piece mount like if you are missing 1/2 mm plus or minus then its hard to fit the motor snag.

dont dismiss them you will meet them in the future, they are easy to mount engines on and easy to get and they are cheap.

sure there are planes that will not accommodate them or they are not fit but find how to work around it.

there are two piece sig glass filled motor mounts, they are cheaper and come with the hardware but then you cannot replace them with other type of mounts so you buy several.

use the method chuckW mentioned thats the way to go.

The Dave Brown mounts have my vote also. Just make sure you have the one that fits your engine, I used one that almost fit the OS 40 in my quickee, I had to spread the beams just a hair. First prop whack and the engine was out, the mount broke. HUMMM must have been do the the age. Put another one on the plane and a week later a repeate. I finally got one that fit and all was well. They even have them in the "L" version for four strokes. My next favorite mount is the Dubro viberation mounts, although when the rubbers start going soft the engine can move around a bit. I don't like the mounts I've seen with the ARF's, even though the one with the Pheonix FunStar looks exactly like a dave brown, except it wouldn't hold a four stroke, even though the setup showed using one in the plane.

Tatone makes a good mount.

Don

Just bolt the mount to your firewall and leave the bolts a little loose. Set your engine on the mount and adjust the sides to fit. Then gently snug up the bolts, then tighten them. Recheck by seting the engine back on.

I just completed my first plane a GP PT-40 it came with these mounts the only problem I had was I needed to sand them down because they would not slide after that I had no trouble aligning everything and mounting the engine. Evolution .46

I love the Great Planes mounts. They come with a mounting guide in the instructions that eliminates having to try and get the mount all lined up. With the guide, it is just a matter of lining up the center lines. Good Luck, Dave

I went out and took a look at what I had in my shop, I sure have used a lot of different makes and models of mounts but the GP adjustable is the hands down winner. I pretty much do everything Chuck does but I also take a cut off wheel and when I get the engine mounted I make a center line between the two halves. No real reason to do this but I started doing it years ago to line them up before I hit them with a daub of CA. Then I removed the engine to mount the mount onto the fire wall. I catch myself doing odd things like that just because I have done them for years, no real reason, just bacause!!

I have experimented with quite a few brands of adjustable mounts. I find the Great Planes mounts to be the easiest to work with, and quite sturdy.

That being said, there's always one bolt that doesn't like to go in as smoothly as the rest, but never a serious problem.

The world models arfs come with a 3 piece adjustable mount, and I didn't have any problems with them. Gotta stand the plane on its tail, but its not that difficult. Haven't used the GP mounts though.

My only complain with the GP mount is that it transfers a good amount of vibration to the rest of the airplane, but it is something that I can live with.

Yes they do vibrate a bit more. I have also seen in instructions for four strokes that you should not use them due to expansion, torque and vibration but being a lunk head I still use them without problems? I have used Jtec and OS mounts for four strokes and I do admit I like them more but the price is right for the GP mounts so guess what one's I use the most!!