I just wanted to say a few words about the new Biela propellors available from Aircraft International.

I first saw the Biela's last year at Joe Nall, and bought a 27-10 for my 33% Composite-Arf Extra which had a BME102/canister setup for power at that time. I had been using an AM 28-10 2-blade or Menz 27-10, and turning in the 6300-6400 rpm range with either prop. The Biela 27-10 turned right in the same range, but in flight it was the best of the 3 props. It was smoother on transition and during aerobatics than even the Menz, and exhibited none of the "fidgety" characteristics of the light loaded AM28-10. I called it, then, the best of both worlds, with smooth transition from low-high thrust from the prop as it turned up, yet enough drag on the engine to help hold down borderline prop rip as well as very good downline braking.

Fast forward a year and I'm running both the 28-10 and 29-10 Biela's on my BME110 w/canisters, and just bought a 30-12 THREE blade (HUGE prop) for my 3W TOC150 w/canisters. I've been a diehard believer in the Mejzlik CF props for about 5 years now, and thought no prop could outperform them for Pattern and Sequence type flying. I was wrong. With every Biela I now use the planes are smoother, have a lot less noise in the air, have superior downline braking, and about equal vertical performance, all while turning about 400-500 rpm slower than a similarly sized Mejzlik, and without all the prop moan and rip associated with a Menz-s of the same size.

At the Mocksville (SE District) IMAC contest this weekend the prop performed very well, being substantially quieter in the air than almost every prop at the Meet, but still hauling my 39.5 lbs (Dry) Composite-Arf 40% Extra around VERY well, helping it to fly a lot smoother than it was with the AM 30-12 3-blade I used to use, and making the plane make ME look good.

Current RPM figures on the 3W150 are in the 5300-5400 range and it dB's at about 92 dB or so under IMAC testing procedures. On the BME110 powered plane, the 2-blade 29-10 Biela turns right at 6100 rpm and dB's in the 90-91 dB range, and the 28-10 turns about 6450-6500 and dB's at about 93dB. Construction of the Biela is a "painted in the mold" Carbon fiber layup with hollow blades with the CF laminated over a hardwood hub. The blades are a BEAUTIFUL white with red striped tips, and the spinning prop is a thing of beauty as the plane is taxiing or flying slowly by. It looks VERY scale, and if the plane has a lot of red and white in the color scheme, it's a very nice match.

Most people with 150's will want to use a 29-12 3-blade to let the engine unload a bit, but if your engine has some conjones, the 30-12 3-blade might be the ticket. 3-blade sizes for most 100-110 engines will be either the 25-12 or 26-12, and the 27-10 or 28-10 two blade is a good match for most 100 class engines.

For instant get-up-and-go, the Mejzlik is superior, without a doubt. But the overall compromise necessary to fly IMAC and pattern-style precision aerobatics dictates more than just brutal acceleration and vertical performance. I consider the Biela propellors to be superior in this category.

For more information please contact Gerhard at Aircraft International. I have little doubt that others will find these propellors to be exactly what I've said they are. . smooth, beautiful, quieter than most others, and a good match for precision style flying.

Glad to hear Kris^.I am breaking in my ZDZ 100 with a 26-10 Menz s but I also bought a 27-10 Biela for it.Can't wait to try it out now.
They sure go with the Patty scheme well.

Jack

I have to concur on all accounts. I use a 32x10 Biela on an old 3W 140 and like it the best of all the props I've used on that particular engine. It spools up nicely and gets around 5900~6000 which is good. It is 31 7/8" long and weighs 13 ounces.
You owe it to yourself to try a Biela if you can, although it's not like a .60 where you can haul around a half dozen props at a time[&:]
Oh well, that's the price of progress

One question Bob. .What the heck are you doing up at 3:20 in the morning??? Geesh

As for hauling a lot of props around, it would not be necessary if more people gave reviews of of them and how they performed. A lot of "Prop choice" also comes down to a flyers personal preference and flying style. For my 150's I have about $750 worth of props laying around, including the Mej 32-10, Fuchs 33-12, AM 30-12 3-blade, and the the 3W 31.5-14x8 and 31-11 props. They all perform differently and can be used in a discrete "niche" type of flying scenario. I consider the Mej 32-10 a great all around "lets have fun" prop, the Fuchs is a good two-blade choice for pattern style flying, both the 3W props unload and rip really badly over 1/3 throttle, yet they are the best 3-D props in the group and will PUNCH a plane out of a hover, and the AM 3-blade is now my backup for the Biela. As for 100-110cc sized props, Mejzlik 28-10, Mej 28-12, Mejzlik 29-10, Menz 27-10, Menz 28-10, and the 28-10 and 29-10 Biela's. Again, they all do different things and perform quite differently depending on the airframe they are bolted to. I'm sticking with the Mejzlik 28-12 on my BME-110 powered 40% plane, simply because the plane is nothing more than a 28 lbs Fun-fly, and that's the way I fly it most of the time. By bolting on the 29-10 Biela, however, the planes nature changes a lot, and very smooth sequence flying is possible if the rates are turned down.

Not even gonna talk about the silly prop for my 240. . . .

yep, love the Biela props too, and that is what the new DA 100 will be swinging on the soon to arrive (hopefully) Composite ARF Yak 2.6M.
Not only do they perform nice, but they also look soooo cool.
Here is my 35% Carden Cap (Sold) and GP Christen Eagle with Bielas. (27x10 and 22x10 respectively)

I was trying to get tired again after the police called the house to let me know there was an open door at work[X(]
That was fun[:@]
Anyway, my post says 08:19:25am? Where can I change my timezone??

I have a Biela 22x8 prop on my 28% Laser 200 with Brison 3.2. They look *****in' and performance is terrific! I will be buying another soon as a not so smooth landing just skimmed the tip on the runway[:@]

Id love to try some of those props too... a big one for my 150, and a smaller one for my 100

You can get Biela Props in any color combo or custom look as well. Contact John Jeffries at Triad Aviation www.triadaviation.com Here is a prop that I am having made for me right now a 2 Blade and a 3 Blade pictured. The props will also have the text and star done right in the mold. This prob is being made to match a new signature scheme for my new AeroTech 40% Yak 54 128.5"WS. I am waiting on final pricing for it but John tells me custom work is very inexpensive just be prepared to wait as the work is all done at the Biela facility over in Poland.

Oh man, that is beautiful!!!