How many RPM should a new BME 110 turn with a BME 28/10 prop? It only has about 20 min run time and is turning 7200 RPM static. Also what temp should it run at and what would be the max? Thanks

Try another tach, yours sounds optimistic by a bunch..

Did that, A friends 10yr old tach read around 7100 and my new one read 7200. I'm using a BME wood prop and am getting a pretty good rip on the ground. It sound like it is a bit much. This is my first twin is why I ask, I have been flying G-62s for aver 10 years and they don't turn up like that. Thanks

A G62 turns a 22-10 at that rpm..
I sent Keith one of our race props, a 19-18 carbon..The GT80 methanol racing Zenoahs turn it 9000 on the ground, 11,500 in the air..Keith put it on a 110X on gas, turned 10,500 on the ground...Sure would be interesting to see one in the air...
The Zenoahs clock 188 mph at that rpm...
Unfortunately there is no racing class for a 110X engine[&o]
Hey RTK...Can we borrow your 110X for a test in one of our Formula 1 Kelly airplanes?
200 mph is a distinct possibility

I gues I should said a (stock) B&B G-62 with a Menj 23-10 doesn't turn up like that. It sure doesn't rip like the (stock)BME 110 with a BME wood 28/10

Who would fly that thing Ralph.
The wings must really be strong!

The wings broke on the early race planes, then carbon fiber and other composites were discovered...Our 45 lb Unlimiteds do 180 degree turns at 230 mph and survive...
Racing DOES improve the breed...
Look at Honda..Started after WWII with some generator engines on bicycles[8D]

I don't think the 7200 rpm number is out of line with a BME 28-10. They are pretty much modeled after a Menz, which has fairly narrow blades. Now if the 110 turned that kind of rpm with an MSC 28-10 I would be either pretty darn skeptical or absolutely amazed!

If you feel like springing for the cash, try a Biela 28-10. In your engine class it's sweeeeet!!!

A 22-10 MSC turns 500 rpm less on a G62 compared to a Zinger...

Who sells the Biela 28-10 and what's so sweeeet about it? It might be worth a try.
I have a couple more friends that have tachs and will check it with one of those. 7200 sounded a bit much to me also but that is what she reads, checked it twice and got 6950 on the first run and 7200 once it warmed up.

you may or may not like the biela, the best 3d props are the prince, you better have some $$ to blow, they are not cheap! The NX Pro from air wild are also very good too.

The Biela props don't appear to "unload" as much as some other props. What you have on the ground is pretty much what you'll have in the air. The reason? I really don't know, but they perform very well. I'm not going to go into some song snd dance about how one prop is better than the rest, but just say that I've tried a bunch and the 29-10 Biela works better than others so far on my 105. We'll try one on RTK's 110 when he brings it out.

If you want one you could prolly try calling Cactus or 3W. Biela has a site but the pricing is all in Euros. 49 Euros plus shipping for the 28-10 two blade.

You can borrow it any time you like. I would just appreciate that it does not contact the ground nose first. At least not at 200mph

Those #'s don't sound unreasonable to me. Just don't be running it for more than a few seconds and the ground at WOT or soon you will find those #'s dropping drastically.
Don't worry about the temps, as long as you have it baffled well and slightly rich on the top end you will be fine. Don't do a lot of ground run ups, sometimes the air flow is not what we think it is.


Yes Pat we will have to see some time, we might both be amazed

7200rpm with a 28x10 BME prop still sounds high, if the BME prop is similar to a Menz-S 28x10.
A buddy's BME-110 on in-cowl mufflers turns an MSC 27x10 @ 5600 rpm.
I've never seen any 100-ish (3W or DA) motor turn a Menz-S 28x10 more than 6500 rpm. The Menz-S blades are fairly wide, but thin. The MSC blades are way thick at the root - look like a club.

I believe the BME props might be a little more narrow. I have never run an MSC, but I have seen them and they are a lot of wood for sure.

As for your friend and his MSC 27x10, that doesn't sound right. I have lost all my notes for my engine, but I know it was swinging a menz clone (3w) 27x10 at about or above 7000 when brand spanking new. So to only be able to spin an 27x10 @ 5600, something is wrong, That's over 1500 rpm difference!!!
Beside that, the engine is going to needs to run in the mid 6's for performance AND that is straight from the horses mouth.
(and I know there can be a wide variations between same props from the same manufacturer)

Looking side by side of the bme and menz prop I have, they look almost identical, except the bme is actual length, the one I ran seemed like more of a load than a menz, it wouldnt turn up the same as a menz, thats just my experience though. Also this past weekend, we put a new bme 27x10 on my friends DA 100 with stock mufflers, and it would only pull that prop at 6200, motor broke in, and only about 75 degrees outside.

So Flyinrazrback:
You had a BME-110 and 3W-106.
Does 7200 rpm with either a BME or Menz 28x10 prop make sense?
Maybe with a Menz 26x10, you might see 7,000 rpm?
Something's not quite right here.

Diablo, it doesnt sound right. Like I have mentioned before the best I could get out of my 110 on a menz 28x10 was 6400. Best on the 106 on the menz was 6600 (friends 106 6700), both on stock mufflers. I know the bme prop is a little more load, so I cant see it turning up that much with the bme 28x10. I would take the 28x10 thats on it and measure it to make sure by some freak chance it was mislabled, etc. It took my 106 on full length tuned pipes to break the 7K mark on a 28" prop. I would like to see it run, if it does run that hard, its not a typical 110, dont get me wrong its a fine engine, but the typical one does not run like that. With a 26x10 it will get to 7K, my DA turned a 26x10 at 7K, but quickly realized I didnt want that many revs on mine breaking it in.

Ooops, Sorry--I mis-read the prop size originally NOW I feel stupid, I thought Modified said 27x10, and that is not unreasonable at all.

Diablo-You would see 7000 no problem with a menzs 26x10 but not 7200 with a true 28x10

razrback--I still think a stock 110 will take a stock 106, but I have no proof of this yet. Then again, maybe i would be disappointed.

The only thing I do know for sure is that I am 2 lbs less than any 106

.

RTK, they are pretty close, the 110 and 106, depending on how the 106 is setup. My friends 106 on cans mejzlik 28x10 at 7150, thats pretty stout. My 106s have been stronger than my 110, even my stock 106. The advantage of the 3w is able to go up in prop and not drop off too much. Each has its place, I would go with a 110 on a 23lb plane or so, but on the larger 35% planes I would take the 106, but thats just me. One thing to note is how the engines are refined, the 110 is balanced well, ports are big, etc, more so than a stock 106. Now look at a 3w 106 with all those refinements, and thats a different motor. Back on track, I just cant believe 28x10 BME at 7K +, maybe extreme circumstances running the 110 on full pipes, but thats pushing it.

Well guys, I finally got a chance to check it with two other tachs and I am getting 6550 on both but am still getting 7000+ on my new tach(cheap GlowBee). She still ripping the prop and sounded a little lean so I richened it up to 6450.
The reason for the origonal post was that 7200 didn't seem right to me either.

the tach might be bad, mid 6k sounds reasonable, especially with the cooler weather, Mod, not too many folks fly in Ada I imagine? out in the sticks!

The tachs going in the trash. It is cool here, around 50 or so.
We have a nice little club around 20 members give ar take, mainly older and they don't think much of my 3D-ing but thats what got me back flying again after about 10 years, it was something different. I've been racing a IMCA modified for a few years and that doesn't leave much time for any other hobbies. I told all my buddies it was going to be my last year and when we had a good year and won the track championship they couldn't believe it when I quit and sold the car. It's all about planes now(again)

Hey RTK, just kidding
We DID clock 208 mph with a Husky Challenger 8.8 twin in a Formula 1 Kelly...Worked great just before the whole front of the plane came off, firewall and all...