As I said in a different post this is my first gasser. So I am posting pics of my progress mounting the engine to help spot any problems before I go to far. Tonight I drilled the holes and bolted it on. I had to put it as far over to the side as possible to allow for the built in right thrust in the firewall.

The standoffs are built from plywood that I glued together then used a hole-saw to cut out. This also put a 1/4" hole through the center of them. The builts are 1/4X20 3" stainless steel bolts, with washers and a lock nut on the other end.

I plan on cutting out an opening behind the carb to allow for easy hookup of the linkages.

I will post further pics as I make progress. Any thoughts/suggestions appreciated!

Thanks

Looks good so far. Good job with the standoffs! Now use a hole saw to cut a 1" to 1-1/4" diameter hole in the center of the firewall for odds and ends to pass through. Don't worry, you won't weaken a thing. Next, thin out some epoxy with alcohol and paint the inside and outside of the firewall to seal it and perhaps stiffen things up just a tad more.

The only item that could trouble me are the nylon lock nuts. Nylon loosens with the application of heat. Better, IMO, are standard nuts and lock washers along with the use of Locktite. Better still is safety wiring, but that's not practical at this size.

Carefully think out your throttle linkage installation before you cut any holes. Be sure to allow for any radial movement as the throttle lever travels through the arc. You don't want to cut a bigger one than you need.

Pat

Are you aware that there is a Thread here that already is dedicated to the Ultimate build? Not sure if you knew that or not. You might consider adding your build to it. Just a thought...
http://www.rcuniverse.com/forum/m_29...tm.htm#2965626

Very good looking install so far! I didnt take pictures of my build. Maybe I should but I get bored and would rather just knock it out. I used some standoffs that can be found at Lowes.

Do as Silversurfer suggested to route all the goodies. Make sure when you mount up your ignition and ign. battery you have some good thick foam to help isolate vibration! I can take pictures of the setup of my Ultimate if it will help. Go check out the ultimate build thread. Its very helpful! Myself I have built a bunch of bipes so I sorta did things my way and it ended up the same in the end.

Oh yeah, with that engine you will want to save as much weight up front! Go with some lighweight wheels and a CF spinner! You will probably have to make a battery hatch to mount your rx batts farther rearward. Make sure you balance your prop at the tips and hub too!

Thanks so far! I wasn't sure about the nuts, I will replace them. A guy in my club recommend spare urethane to fuel proof the engine compartment, and behind it. I was going to do that after everything is cut out.

I do know about the utlimate build thread and have read it many times. This is just for the engine part (mine specifically), since I hate sorting through mile long threads.

The epoxy will penetrate into the wood. The urethane will only skin it. Urethane has been known to peel off with time.

Looks like you have reinforced the firewall some on the inside of the motor box. Have read some threads about the EVO58 severly loosening the firewall to the motor box due to vibration. You may just want to research that a little more. Just involves adding a few more corner braces. That engine sure looks good out there on the nose.

I can't figure out how any of the engines that will fit this plane can "loosen the firewall to the motor box". The motor box structure extends all the way back to the wing saddle, and is cross supported on top of that. It's built reasonably light, but definitely strong enough to hang a 4 cubic inch or larger engine on it if you could get it to fit. And balance, which it would not.

I'm extremely familiar with the construction methods used on this plane. Since I had the time, and that I had some ideas I wanted to look into I removed a very large amount of the covering on the plane. The full bottom covering, one side from the nose to the wing saddle, and half the front side opposite the one that was removed to the saddle. The Ultimate is built very well!

Pat

Ok, this is going to sound stupid, but this is my first gasser, and the intstructions are not very clear on the fuel hookups. So I am not sure what is what. Based on pictures of other installs on this engine (evo 58) I am making some guesses. Please let me know if I have anything wrong:

First lets define top as the 'top' as you hold the engine upright, it is mounted inverted, so it is reverse when upside down.

Air pressure Inlet on top of carb: Goes to pressure line in fuel tank similar to the line that goes to the muffler in glow?
Pressure Inlet bottom of carb next to choke lever: hooks up to the clear tube that goes to the crank case?
inlet on side of throttle arm: fuel intake.

Also, onto the muffler, I have the bisson muffler from Tom at wild hare. It looks I need to plug the pressure tap in the muffler correct? And there is also this bar with one screw screwed into the muffler, what is that for?


Thanks

Silversurfer, I am only refering to the posts by SAL98 and his Ultimate with the EVO58 engine. I am building a new WH Ultimate also, and very much appreciate the input that you and others have posted in this forum. Tom's products are exceptional...I have the Edge 540 as well, so I am sold on the products and service with Wild Hare.

<bump> Nobody can/will help me with the questions I asked above?

One of the carb inlets goes to the pressure line from the crankcase, I don't remember which one but it's the one that's closest to that line. The line only needs to be about 2 inches long.

The other carb inlet goes nowhere. Do not connect it to the tank vent line. The tank vents to open air.

You do not need to plug the muffler smoke fitting. That bar is to be bent and attached to a convenient mounting screw to support the muffler against vibration.

TF

KevinS,

My apologies, I was not aware of the new questions or else I would have answered. Glad to see that Tom got in there.

As Tom stated, the bar is a support bracket for the muffler to be mounted in a manner the owner finds most appropriate.

So I can just leave the 'smoke fitting' on the muffler open? ok.

I am still confused on the fuel hookups.

Looking at these pictures from someone elses setup:
http://image.rcuniverse.com/forum/up...50/Xt60019.jpg
http://image.rcuniverse.com/forum/up...50/Lr39555.jpg

I would think the line 'closest' to us in the picture is the fuel line. Now, in this picture there is a fitting both 'above' (on the 'bottom' of the carb, but the engine is inverted, so its now on top) the carb and below. I can see he has a second line plugged in somewhere where does that go the top or bottom?

From tom's description I would have thought just a fuel line, and then connect the crankcase tube to one of the inlets (still don't know which one since they are 'above and below' the carb. I am assuming it must be the one on the bottom (when engine is upright) since that is closest to the tube.) But in the above pictures I see 2 yellow fuel lines, I don't get where the second one is going if the third inlet is to just be left 'open'

Thanks!

The smoke fitting can be left alone. It hurts nothing at all to leave it open.

One line from the tank is for fuel supply, the other is vent to the atmosphere. Anything else is probably an open line. Check with Tom or someone with your engine type for more info on that.

Pat

KevinS,
How far from NH are you? I am about 45 minutes north of the border, west of Manchester NH. My WH Ultimate has been done and ready to go for a while now, just waiting for weather and opportunity to present themselves at the same time...
If you really get stuck, maybe you could come up sometime with yours and we could go over it.

PS, Thanks you guys, lots of good usefull info in the other threads regarding balance and handling ect... Nice to have someone else do the R&D for me!!

Ok, thanks. That is pretty much the information I had gotten on how to setup the tanks, but the pictures I was seeing were confusing me. So I will leave the muffler smoke tap open, connect up the fuel line tap to the gas tank, connect the one tap that is closest to the crankcase tube to that, and just leave the other one unconnected to anything. (and the tank gets the standard 'loop' in the vent line to prevent fuel leakage)

I am about 1 hr from NH. I do have plenty of resources for help within my club on gas, but being as its winter and we can only fly on sunday's at our field over the winter, we don't fly much, but thanks to this 'thaw' we have had, I might be able to get out to field sunday hopefully, I might drag this engine along.

As a side bar, there are a couple of methods in the set up of a fuel tank and lines. The most common are two line and three line. Since I believe in the K.I.S.S. method, I'm only goint to provide the two line system.

You have the usual number of lines inside the tank, 2. One is the supply to the engine, the other is the vent ot the outside atmosphere. I usually find a location on the bottom of the plane that's close to the tank, drill a small hole, and run the line out the bottom and forget about it.

For the supply, you will also have a "fuel dot" included in the hardware package. That will be the method of filling the tank. Find a suitable spot on the side of the fuselage that has a pretty clear shot at the front of the tank and install the 'dot" using Medium CA. Don't get CA inside the "dot.

You will need to "tee" off the supply line from the tank to install a line to the "dot". There should also be a "TEE" in the hardware kit for this. Install the "TEE" in a location that will let the line exiting to the dot move freely without kinking the supply line from the tank. Use the small plug that was installed in the "dot" to cap off the fill line at the side of the fuselage. You should now have one end of the "TEE" without fuel line on it. That end goes to the engine.

You may want to install a fuel filter of some sort in the supply line from the tank, but other than that the fuel system is now complete.

Be sure that when you set the fuel tank up in the Ultimate to bend the vent tube inside the tank to the "bottom" of the tank. Remember that the usual tank bottom becomes the top in the Ultimate.

Pat

Kevin,

I just re-read your last post since I've been running hard with little time and am missing things here and there. Regarding the fuel line connections, one line should go to the carb from the tank. Not being familiar with the EVO 58 I don't know what the crankcase nipple would be for, except perhaps a nipple crankcase smoke fluid induction. As a rule there is only ONE line going to a gas engine, and that one goes directly to the carb.

Check with someone that has an Evo to find out about the crankcase nipple. It may just be a vent that needs to be left open.

Just to keep this thread up to date with answers to my own questions. I found this information about why there is a nipple on the air pressure inlet. It seems its best to run a line from this back into the fuselage and leave it unattached for a constant air pressure:

http://www.rcuniverse.com/forum/fb.asp?m=3730680

Same as with 3W engines. Something to consider here. If you guys running this engine encounter issues with what appear to be mixture changes in certain flight attitudes, the problem will likely be with the location of this tube. It MUST BE in "dead" air IF it shares the same function as the 3W engine line and ends up to be equally sensitive.

The crankcase tap is for the carb pulse as the evo carb pulse hole is not in the carb mounting block like some. Black nipple = fuel inlet, silver 90o on the plate with 4 screws is as stated above to equalise air pressure etc or can be left off and the only other one go to the crankcase via the clear tubing.

I always put a 6-32 1/2" allen head bolt in the smoke tap on the mufflers that I have used because I don't do smoke and I don't like the "gunk" put out of the unplugged hole!! But, that is just a personal choice of mine.

Bobby

Never thought of that!! I know that just about any fuel or vacuum line with a plug you put there dissappears pretty quick so I gave up on it.