RE: BME 115 Any Field Reports?
 

Thanks Pontiac_40

Yes, I too have heard good things about the BME 115. The most important things for me, since I won't need nearly all of that awesome power, are that it: fit reasonably easily within the cowl and in front of the firewall; start easily; run smoothly; turn a 28" prop; and be reliable.

That shouldn't be too much to ask of an engine that has such a great reputation as BME, so now all I have to do is sell my beautiful, barely bench-run Roto 70 V2, and I will be ready to order one.

If you get one, be sure and let us know your impressions of it!

Ampace

RE: BME 115 Any Field Reports?
 

Talking about having room? That's a 115 sitting in front of a 2.6m Comp Yak 55.:D

RE: BME 115 Any Field Reports?
 

About time you get working on that

RE: BME 115 Any Field Reports?
 

Hey now, I got the tailwheel on too, does that count?

RE: BME 115 Any Field Reports?
 

AmpAce, just like Silversurfer, I'm thinking of using the BME 115 for my comp-arf yak. When I get my 115, I will give you my feedbak here.

SS: You finally got started!

RE: BME 115 Any Field Reports?
 

what props are you all liking on this beast?

RE: BME 115 Any Field Reports?
 

Anything OVER 27". A 28-10 Biela would just begin to put a little load on it. Mejzlik in 28" gets ripped, even worse in 27. 3W 27-10 is beyond loud due to the ripping. In 28" a wider blade wood or Biela. In 29-30" a composite prop is a good choice.

Seems the hole in the diaphragm cover does not like to see big pressure changes so a small cover that deflects the air away from the hole may be in order. Will have more on that this coming Sunday.

RE: BME 115 Any Field Reports?
 

My favorite prop is the Vess 28A. It was the prototype, and believe the production props are not too far behind. Another good choice is the PT 28x10. It pulls hard like a menz, but does not rip much at all, and very light.

RE: BME 115 Any Field Reports?
 

I like the menz-s 27x10 or the mejz 28x10. They will rip pretty easily, but most of the time there is no need to go over half throttle on a 24-27 lb plane with this engine anyway. Haven't tried much else on this plane.
My original baffling was working OK, then I decided to improve on it. That turned out to be a mistake, (made it run like sh$t) now I am starting fresh with no baffling and working from there. Sometimes it is best to leave well enough alone:eek: I do not know if I have a diaphragm pressure problem or an air flow problem over the venturi. (I made too many changes at one time) Now I am proceeding one change at a time, guess I could always go back to my original design..................

RE: BME 115 Any Field Reports?
 

wow this is one bad motor let me do some checking i may need to get me one Yeah baby!:D

RE: BME 115 Any Field Reports?
 

When I was talking to Kieth of BME, he had also mentioned using a 30X10 prop after the motor is fully broken in. I don't have the engine as of yet but from what info I have gathered, it seems to me that using the 30x10 prop would be best if you are using tuned cans. Can't wait to get my hands on this baby!

RE: BME 115 Any Field Reports?
 

I see that Chief Aircraft is selling a BME carb diaphram cover with a nipple soldered on over the hole so you can run a chunk of fuel tube from it, back into the cabin where there is stable air, Kinda spendy though, at about $25 IIRC.

Wow, I like what I'm hearing about the 115. Should tug my big Cub around plenty good at 1/4 throttle!:D

AmpAce

RE: BME 115 Any Field Reports?
 

i took a glob of soilder back in the day and did a lump onto that plate, i then drills a hole for fuel tank tubing. i then pushed it into that hole and ran a fuel tube off of that to the fuse. i am sure its not as pretty as what is being sold but it sure works

RE: BME 115 Any Field Reports?
 

You may not even need to go that far. By this Sunday we'll have an "after action" report on how well a simple cover over the diaphragm hole works out. It has a hole on one side of it to permit balancing air but it won't be aimed into the intake air as the cover is now.

RE: BME 115 Any Field Reports?
 

After trying the stock cover, the aftermarket BME carb cover with nipple and line going to the fuse, 3W 90 degree intake, and the RC Blimp carb plate (new style that is perfectly square with nothing hanging below the carb like the other ones that stuck down a bit below the carb to block the choke butterfly), the RC Blimp carb plate fixed all my issues where the other items above tried did not fix my diaphragm problems, or only helped a bit.

RE: BME 115 Any Field Reports?
 

http://www.rcblimpproductions.com/in.../CarbPlate.htm

RE: BME 115 Any Field Reports?
 

It sounds like you guys are having the same problem that I do. I ended up sending mine back to Keith because it was dripping fuel out of the carb in knife edge on the ground. I guess if the air is pushing the diaphram open it would richen it up. I just can't figure out why holding in knife edge on the ground with the cowl off would be any different than holding it in a normal attitude. I will wait to hear what Keith finds but I am interested in your findings as well.

RE: BME 115 Any Field Reports?
 

The opening in the diaphragm cover faces forward, allowing pressurization. The airflow into the cowl has a viscious left hand swril when it enters, changing the pressurization. The dripping is cused by one of two things, or both. One is excessive vibration transmitted from long standoffs, the other is Walbro failing to install the inlet needle properly on the lift tab.

RE: BME 115 Any Field Reports?
 

Another thing that seems to cause it, and don't ask me why because I can't figure it out, is being excessively rich on the needles.

I should put back the old baffling, everything was fine then, too bad I ripped most of it out. If all fails I will do what razrback did and order a plate. (should do it right now:eek:)
See what happens when you try to make things just "a little bit better"[:o]

RE: BME 115 Any Field Reports?
 

I figured there is a lot of different pressures with the airflow in the cowl. When I did the on the ground testing, it was with the cowl off. I used oak blocks to space out the engine not stand-offs so I don't think that is it. I have also leaned the carb to the point of not transitioning. If I lean it to that point it runs fine in knife edge but is too lean in any other attitude. Keith has it now so we shall see what he finds.

RE: BME 115 Any Field Reports?
 

One more thing I forgot to add. If the plane sits for more than 3 minutes after a run I need to choke it to start. Most of the time twice before it will run. If I re-start it right away it is o.k.

RE: BME 115 Any Field Reports?
 

dbcaster--When mine dripped it was when the High needle was very rich, low did not seem to affect it. Most of my engines need to be choked for restart after sitting, that is why I usually install a choke servo.

RE: BME 115 Any Field Reports?
 

The standoffs are definately not an issue. At least I hope not because that's pretty close to what I'm to be using on mine.

RE: BME 115 Any Field Reports?
 

SS, how long are your stand-offs going to be on your Yak with BME 115, have you calculated that yet? If yes, where are you going to purchase them from?

RE: BME 115 Any Field Reports?
 

I'll get you the length in a bit. They're a little long since they were intended to move the prop almost a full 2 inches out from the face of the cowl. I'll also include a picture because I NEVER buy standoffs. I always make them. Wood is cheap, always works, better dampens impulse shocks, and my stuff won't twist.

Standoff length is 2-5/8" for mine, moving the face of the prop hub to sit 2" in front of the cowl. Needless to say, if you wanted less out front just make the standoff shorter.