I am interested in Propeller, type, sizes and tachometer readings for the BME102

me too. got one sitting here ready for its maiden flight

SO you guys are telling me that [b]NO ONE[/b] has a BME 102 that they have put a tach on?

LOL LOL No not yet just waiting for the right day

But it's killing me to start this motor up

SO have you flown it yet?
What speeds are you getting?
Anyone else with Tach readings on this engine.

Not yet maybe in a week

Jon Leyland has this engine nailed down, as with any of the BME 100cc twins. He is on the forums here as Jleyland if you want to get some info.

I know have been talking to him

but he has never ran canisters before

I don't have canisters!

Hi Geistware,
On my 102 evo the last time I tached it was last summer. I was getting around 6400 rpm on a menz 26x10s. It wasn't quite fully broken in then so it may be slightly more now. I think I'm going flying tommorrow or the next day so I'll try and get some more up to date readings for you. But I think around 6400-6500 rpms on a menz 26x10 can be expected. This engine seems to work best on planes that are 35% and under 25 lbs. I can see how someone may not be pleased with the verticle pull on a heavier plane than that. Right now on my 35% radiocraft extra on a hot day I notice a difference in performance from a cool day. The acceleration out of a hover is a little slower. For me the biggest strength of the BME 102 is its crisp throttle response and lightwieght. The Radiocraft I have the 102 evo on wieghs 24.5 lbs dry.
Hope this gives you the info you were lookign for - let me know.
talk to you soon
Jon

Oh No looks like im in trouble...with my 102 thats on my A.W. 540 it weighs 28 lbs

Hi Dennis - I'm just speculating. Have you flown it? Let me know- I'd be curious what you think. Props of course make a big difference. Also the Edge's are a low drag airframe so you got that going for you [8D] But also if you're happy with the power thats all that counts.
Let me know how it works out for you.
Take care,
Jon

Hey Jon, i have'nt flown it yet....probably in the next week or so.

I'll let you know how it works out with the canister's on it too. maybe i can pick up on something there.

THanks Jon,
I needed some feedback. Now, is the evo engine the three bearing engine? This is the one that I have and haven't had a chance to put a tach on it. I know it is running rich, but I don't need every RPM that the engine has. Just what is necessary to get throught the sportsman and intermediate IMAC routines.

My plane is 25lbs dry with a 32oz tank. at 6lbs a gallon, that should add another 1.5 lbs. I haven't flown in weather hotter than 80 degrees, so I will find out how it does in hot humid weather this weekend.

I do find that I like the midrange, the one thing that I have found is that the engine idles faster after I have been in the air for a couple of minutes. Is this normal on larger gassers?

P.S. Jon congrate's on your finish at the XFC. wish i would of gone to meet some of you guy's but heard the weather was crapy.

Hi Dennis and Giestware,
Thanks Dennis - the weather was a little rough on Friday but it always seemed to brighten up enough for everyone to get thier flights in [8D]
I believe the evo is the three bearing one - Not quite positive though. Make sure you keep it rich - especially the low end. Make the low end as rich as you can get it with still having great throttle response, this will make sure it stays cool and doesn't lean out and stop on you. The high end I've set by going on a full power verticle upline and making sure the engine doesn't sag. Being rich here doesn't hurt either. At 25 lbs dry that should be great. I've found that sometimes when flying a sequence my engine burbles a little on straight and level lines at around 1/2 throttle but when I start doing 3-d and heating things up, that goes away. I probably should lean it just a touch to get rid of that but that may give you an idea of how rich mine is.
I have found the same thing with the idle on my BME's - Mabye when they get hotter they lean out a bit? Not sure about that one. I find that most of the time I have to go down about two clicks on the throttle trim before I land. The other thing is it seems like theres a certain airspeed that the plane has to slow to for the idle to drop just a hair - If I'm above that speed the idle is slightly faster, and makes it difficult to slow down to landing speed. Probably something to do with the airload on the prop. I have found that they will reliably idle at a very low rpm - I've never tached it but everyone tells me I scare them in certain maneuvers with that low of an idle.
It sounds like you're doing it right - just be sure to keep that low end rich especially
talk to you soon
jon

To answer Giestware question on the 102 evo YES you have the 3 bearing crank. I have the same engine

OK, with a MSC 26x10, I get 5750 rpm.
I think the engine is really rich, but I am not good at adjusting.
Also the engine has enough thrust that it flies good.
Not ballistic, but strong.

I think that prop may be loading it too much - Theres alot of wood on that thing Try a menz 26 10s or bme 26 10---
Actually I should rephrase that - If you ever want to try another prop try one of those I listed.

I thought the MSC & menz's were about the same

From what I've seen on the msc prop they are quite a bit thicker then the menz. They look to be the same shape but the msc has more wood to it. I think Tim Mills runs a msc prop on his stuff.

I have an spare 26x10NX propeller that I may try. The thing I like is that this engine is quieter than many of the glow planes at the field. If I am going to fly IMAC. I need some 10's someplace and if the only place I can get them is with the sound score, then so be it!

On last question, What do you do for maintenance on this plane? BME seems to be non-existant and this is basically my second gasser. Just fly and change the plugs each year?

Hi Geistware,
Those nx props are great too. I had one awhile back and really liked it. I haven't had to do anything as far as maintenence goes - On my old 6.2 (the one that came out after the 5.8) I had bearings go bad on two seperate occasions. I'm not sure when to change the plugs- I've never had to.

Thanks Jon, it sounds like my kind of engine. Feed it properly and it will run forever!
I appreciate all of your help!

No problem Geistware - I also tached my 102 evo today on the menz 26x10s - It was only getting 6000 rpm. Thats about 4-500 rpm lower then it should be by my guess, and previous experience. It was really hot today though so I wonder how much that has to do with it. As you can see I'm no expert. [8D] I have a feeling its rich so I'll try and tweak it just a tad. I'll let you know what I come up with.