Engine Mounting Question
 

I'm building an Edge 540 .46

After I have mounted the engine too the brackets which is attached too the firewall...The engine is skew, it turns down too the right at an angle - I know they talk about the thrust etc. Is this "skewness" correct or should the engine be straight towards down the middle of the plane. I just don't want too maiden the plane and have an incorrect mounted engine.

Any help would be greatly appreciated

RE: Engine Mounting Question
 

Korps : I'm not familuar with that Edge but I think you are going to have to give MORE information as to how the engine sits in the mount and how it lines up with other parts of the plane. Sorry I can't help. ENJOY !!! RED

RE: Engine Mounting Question
 

I had the Great Planes Extra 300 .40 size that had the cylinder head angled down at about the 8 o' clock position. If this is what you mean, it is so the muffler on a 2-stroke can be positioned at the bottom so it looks better than coming out the side of the cowl. My Decathlon is the same. The engine mount was already attached in the position for this. You are good to go.

RE: Engine Mounting Question
 

Korps,

Most planes have some right and down thrust (normally about 2%) built into the firewall. If you were looking down on the plane the engine should look like its angled to the right. If you were to draw a straight line from the tail of the plane past the front, the end of the crank shaft should be right on the center line. The engine being at an angle is to help with the torque of the engine.

RE: Engine Mounting Question
 

Thanks a lot guys - I'll quickly check the line from the tail again too the crank and post some pictures aswell. Just need a minute or two.

RE: Engine Mounting Question
 

Okay here are some pictures so that you know what I'm talking about in more detail.

I checked the line up from the tail - it seems too be in a line - perhaps half a mm out.

RE: Engine Mounting Question
 

Is that engine mount stock ? did you build
or assemble the mount ? The reason I ask is,
that first pic looks like alot of right thrust.


Bob

RE: Engine Mounting Question
 

Korps,

Most of the time there are two vertical lines on the firewall. One is the center line and the other is the off set line for the thrust. Your motor mount should be set up on the off set line and as long as the end of the crank is on the center line your ok.

RE: Engine Mounting Question
 

I agree with that it looks like a lot of right thrust, that's why I'm a bit in the dark. I assembled the mount - mounted it onto the already installed firewall then mounted the engine on it. The holes drilled on the two mounts are right across from each other - so I know I didn't mount the engine wrongly on the mounts.

RE: Engine Mounting Question
 

Is there any mentioning in the manual about using
washers as shims, when mounting the mount to the
firewall ?


Bob

RE: Engine Mounting Question
 

Nope none - the manual is very very vague.

It tells you too measure , drill holes for the mount then mount the engine - nothing further. It shows you to drill holes while the firewall is off the plane - but it's already glued too the fuselage so I don't know how they wrote the manual wrongly. They don't even tell you where too drill or how too get the places too drill.

I decided I'll take the plane too the hobby shop and see what they can figure out. This plane was suppose too be 96% build but it was more like a 90%.

RE: Engine Mounting Question
 

There is one horizontal line about a fifth or so from the top of the firewall then there is one vertical line going down. In the picture both dashed lines can be seen on the firewall.

RE: Engine Mounting Question
 

Pic #3 in in your first post with pics. It looks
to be about right. I would do some taxing test
before trying to fly.

Bob

RE: Engine Mounting Question
 

What should I be looking out for while taxing too tell me the engine is mounted wrongly?

RE: Engine Mounting Question
 

I would think excessive pulling to the Right.

Bob

RE: Engine Mounting Question
 

Korps,

Even if you have no right thrust and you fly the plane it will just want to do a slight left turn under full power. Just cut the throttle back and fly it around. Once you get back home add a washer at a time until you get the flight path you want. New guys to Profile planes find this out very quick sinse there is no thrust built in and add washers to the back two engine bolts to get a couple of degrees of right thrust. Problem solved.

RE: Engine Mounting Question
 

So if I understand correctly (sorry, I'm new too all this technical stuff) - if the engine isn't correctly aligned, which could be in my case, it will just tend too roll/turn too one side under power or could it result in more serious things?

RE: Engine Mounting Question
 

It may just not fly straight with out alot of
rudder input or it may be fine. Like zippi
said, try and throttle back at first. If you can
get it trimmed out and are happy with the
flight path once trimmed, your good to go.

We take it you do have flight experience ?


Bob

RE: Engine Mounting Question
 

Yes I do have. I started flying with a Stick and still flew it up until now. The reason for going for the Edge and hanging up my Stick is because I got bored of the Stick a bit because you can't do a knife edge really etc :)

I just want too thank you guys a lot for the help - I really learned from you guys. I'll test it and take it from there.

RE: Engine Mounting Question
 

Let us know how it flys and enjoy !


Bob

RE: Engine Mounting Question
 

double post opps

Bob

RE: Engine Mounting Question
 

The hobby shop owner picked up my plane this morning too take it too the shop. They are putting on a new muffler (the old one is giving problems with the fitting off the cowl. The engine was apparently anyway mounted too far forward. Will get the plane back in the week somewhere and this weekend I will take it up for some fun. Will probably have too sell my Stick too pay for the new muffler :P hehe.

I really hope it flys well and that you can do a lot with it. I haven't sworn so much in my life as the past week lol

RE: Engine Mounting Question
 

In your original photo the engine mount is the problem...

Look at the photo and pay attention to the right arm of the mount... as seen by a pilot...

It is angled OUT at the engine. This means that the mount was set with the arms too close together at the base.
When you mounted the engine you effectively added more right thrust than that provided by the firewall.

You need to always make sure that the mount arms are parallel to each other and perpendicular to the firewall, before you drill the engine mount holes.