Any BME 110XTreme updates?
 

I assume that a few people have received theirs by now. Any reports?

Any BME 110XTreme updates?
 

I actually saw one in the hands of a fellow modeller last night (8/20/03). Remarkable engine. He still does not have the ignitions and mufflers available though,

Gerry Rosebery

Ignition and mufflers?
 

So is it going to take a year to get these now? :D

Any BME 110XTreme updates?
 

What ignition does Kris have?

Any BME 110XTreme updates?
 

I have a CH ignition, and a spare. :)

Any BME 110XTreme updates?
 

So its the same ignition thats on the 102?

how SWEET it IS!!!!
 

Got in flights 18-22 on my Xtreme today. Startng to get into "Propeller problems" due to noise issues. A Mejzlik 28-10 is turning 6900+ on the ground, and just makes a ton of noise in the air. Menz-s 28-10 is right at 6100-6150 and will start barking at 3/4 throttle, or at the slightest provocation after a downline.

WHAT to do??

I have a 29-10 Mejzlik that I intended to eventually try on the engine, after it was fully broken in, but with the 28-10 Mej zooming like crazy, and the Menz dragging the motor down more than I like during break-in, I decided to experiment with the 29-10.

If you have seen the 3W CF "3D" prop, which is 31.5 x 14x8 pitch and has a very square tip, you would think it would be very noisy. As a matter of fact, it's quieter, at the same rpm, than a Menz of the same size. That is is how I modified the tips of the 29-10. The prop was really about 28.75" in length, so I shortened it to 28" exactly, and added the "squared off" tip that has a rounded front corner and pointy rear corner on the tip, then rebalanced the prop. The blades chord is about 10% wider that the chord on a 28-10, and noticeably wider toward the tip of the blades, giving me a "wide blade" prop with a squarish tip. . VERY "Full Scale" looking prop.

How did it perform? 6300-6350 hot, after landing, no loss of pull, much smoother in the pattern, and MUCH quieter. The wider blade is DEFINITELY helpful in keeping the noise down, while suffering no loss of performance.

The current setup for the Xtreme is the stock CH ignition, 3.5" headers feeding into "70cc" PEFA Canisters. There is NO tuning from the exhaust, since the primary tube length is about 3-3.5" too short to help in the 6000-6500 rpm range. It does quiet the engine a bit, though, and with the 28-10 Mej spinning 6900 or so during an IMAC style dB test, it passed with a 94-95 dB readng at 25 feet over grass. The engine idles as low as 1100 without a whimper, and 950 can be had if you are careful getting the motor down that far.

Prop slippage is NOT a problem. I've used the two Mejzliks, and the Menz, and none of them have moved a degree once the nut is tightened. There is no sign of overheating or running problems, and the motor just keeps on running. I'm getting 17-18 minutes per flight from a 32 ounces tank, with about 8 ounces left in the tank after landing. With 20 flights so far, and about 4-5 hours on the engine, it's starting to break in a bit, but I figure it's going to be another 5-10 gallons and 8-10 hours of flying time before the engine will have reached it's performance potential.

I'm looking for a solid 6400+ with the Menz 28-10, and about 6600 with the modified Mejzlik 29-10, after the engine gets fully broken in. It's also just a tad on the rich side,during break-in, so I'll be able to play with mixture soon as well. Of course, the 28-10 Mejzlik would be seeing the high side of 7000 by that time, and that's just TOO much.

I can hardly wait till I get an airframe that will hold proper headers and canisters, so I can "tune" the exhaust for the 170 degree exhaust ports and pick up some more power.. .

Let's see. . 6700+ with a 28-10 Menz-s, and about the same with a REAL 29-10 Mejzlik . .that hurts just to imagine. I wonder if there is a 30-10 in the future for this engine. :)

Any BME 110XTreme updates?
 

Get us some peeeeeeeerty pictures of that engine! Also, have you been able to weigh it and if you could so we can see just how accurate the weights are.

Any BME 110XTreme updates?
 

Hey Shortman, you must not have seen these, so go HERE for all that stuff!

Re: how SWEET it IS!!!!
 

Kris, so you're using the same ignition and plugs that come with the 102?

Any BME 110XTreme updates?
 

Being that CH has been lax in ignition deliveries, Tim, I modified mine with a pair of (GASP!!!) Da plug caps. Work just fine. I have two ignitions set up for the new 110's. It's a pity such a great engine is limited on deliveries because another company can't get its butt in gear. The ignitions have been on order for aobut 4-5 months now. . guess that says a lot about CH's priorities.

Any BME 110XTreme updates?
 

Thanks Tim! Wow, that 110 sure looks a lot smaller then that 102 EVO... You would imagine it be the other way around...

Keep up updated on the testing!

Any BME 110XTreme updates?
 

You think Keith could get some ignitions from DA? ;)

Any BME 110XTreme updates?
 

Do you think Dave Johnson could put his overweight and underpowered 100 on a 2 lbs diet???

Same answer.

Any BME 110XTreme updates?
 

On SECOND thought. . I think it's about time BME "weaned" itself off "manipulatible" outside sources for parts and such. . perhaps they should just copy the 3W/DA (DA IS using the same design of ignition as 3W. . you DID know that. . right???) ignition system. . which is actually a copy of a 1933 BOAT engines ignition. Seems that after 70 years it's still a hard design to beat.

I'll pass your suggestion along to Keith, Jon. . . maybe you are on to something after all. :)

Any BME 110XTreme updates?
 

OH. .almost forgot.. Keith got an ignition shipment in from CH yesterday. . ought to be sending them out to people for engines and then mating them to engines and shipping THOSE within a couple of days. . possibly even today.

Any BME 110XTreme updates?
 

Mufflers?

mufflers?
 

Another year? :D

Prop readings
 

Hey Kris: The numbers sound very impressive. Have you tached a Menz 27-10S..I would like to use this as a reference to my little QS-106..

Ignition
 

So our current electronic ignitions are copied from a 1933 BOAT ignition ? Sometimes ya just hafta sit back and laugh at the "expert" knowledge seen here.........
1933 ? Please enlighten me, what 1933 BOAT ignition had surface mounted components, electronic control, or ANYTHING else other than spark plugs common to 2003 ignitions ? And resistor spark plugs most likely weren't even invented then...
EXPERTS ? Right......... :D

Any BME 110XTreme updates?
 

Boy Kris. You sure do take alot of abuse here. I'm glad you put up with it. I really appreciate all the info. you had given us on the new 110Xtreme.

Any BME 110XTreme updates?
 

The basic timing setup is the same design, you should know that (you ARE an expert. .right?) it uses a simple inductive pickup that increases advance due to quicker saturation the faster the magnet passes by, same as 70 years ago. There is no timing "delay", no specialized timing circuitry (such as in a "synchro spark module") and the basic circuit is a pretty simple and unimaginative set of components.

yeah, today we have transistors. . back then they used a small tube and much larger components overall, but it's the same basic design with toroidal coil, capacitive discharge to excite the coils, auto "advance" by the speed of saturation of a pickup coil (Though they probably used magneto-sized pieces) and a few "balance" resistors and diodes (which existed back then) to make the circuit work.

Same design and principle. . .I'm surprised you did not know that. Heck, how do you think they fired off engines back then. . they quit using magnetos about the same time, in many cases. this is the next logical step up from that, with points and a mechanical/vacuum advance coming along a bit earlier.

Any BME 110XTreme updates?
 

Wow hehehe, dont think he will be saying anything back lol...

How is the motor running Kris? Sounds awesome!

Any BME 110XTreme updates?
 

Motors running good, Shortman. . .modified a 29-10 Mejzlik to get a wider blade chord out past the blades center of length. Can't really use a 29" prop on the fiberclassics small Extra. . has barely enough ground clearance for the 28" props, and if the grass is up, it's a lawnmower :) I clipped the tips and made them square with a rounded front corner. .pulls very nicely, cut the rpm a little bit over a 28-10 Mej, and is MUCH quieter. It's even quieter than a slightly slower turning (6350 vs 6200) Menz-s 28-10, which is very nice to see.

I'll be pulling the engine out of the plane in a couple of weeks and then do some intensive "bench tests" with canisters and headers and props, to get all the possible combinations I can come up with. I'll be checking for power, transition, NOISE, and basic runnability with off-the-shelf items. As well, I have a set of special canisters being shipped in from a guy in Australia who has been doing some development of a design for BME. It looks very promising at the moment, and we are bantering around the idea of a 2-1 design that will take up less room and help balance the scavenging of the cylinders for more equal power production.

I'm going flying EARLY tomorrow morning. . I'll keep the tach handy, but my main objective is to get 8-10 LONG flights on the motor and get it broken in some more. I'm down to 2 gallons of "break-in" mix, then I'll switch over to 100:1 Amsoil. right now the engien is just running so flawlessly. I havento touched the needles since the first flight some 2 weeks ago, but when I switch off the break-in mix I'll start tweaking the top end a little to see what happens.

Any BME 110XTreme updates?
 

Klots, I'll bolt the 27-10 Menz on the motor tomorrow and take a tach reading for you. . this is gonna get noisey!!!