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RE: BCMAEngines - 4/28/2008 4:32:59 AM   
mmattockx


 

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From: Calgary, AB, CANADA
Status: online
quote:

ORIGINAL: e-fly

XOAR
18*6 8000
17*10 7400
16*10 8200



Any information how the 26 or the 28 respond to a tuned pipe? 17x10 @ 7400 is very good, but more is always better.

This may be the engine I need for a 2M pattern plane I want to use gas power on.


Mark

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RE: BCMAEngines - 4/29/2008 2:38:18 AM   
Pit-Viper 1



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Joined: 9/14/2005
From: Westminster, CO, USA
Status: offline 		The way I measure thrust is too use a digital fish scale. Tie a small rope or twine to one end and anchor it to something solid, then attach the other end to your plane. Fire it up and check your thrust.. Works pretty well. Haven't been able to use it on mine though as I'm having issues with my motor, think I'm having carb issues. Gonna see if I take it up to Adam's when I'm off for a little TLC and maybe a different carb.

Shane

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RE: BCMAEngines - 4/29/2008 3:18:59 AM   
linkadrip



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Joined: 3/17/2006
From: Tehachapi, CA, USA
Status: offline 		Cool idea i like that one. Wish i had a digital fish scale. Hmm something new to add to the Hobby box Digital fish scale. lol

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RE: BCMAEngines - 5/2/2008 1:14:10 AM   
Pit-Viper 1



Posts: 888
Joined: 9/14/2005
From: Westminster, CO, USA
Status: offline 		This is the one I use, their are cheaper ones, but it does a good enough job..

http://www.llbean.com/webapp/wcs/stores/servlet/CategoryDisplay?storeId=1&catalogId=1&langId=-1&categoryId=45660&productId=798352&qs=5686476-Nextag


Shane

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RE: BCMAEngines - 5/2/2008 2:31:33 AM   
linkadrip



Posts: 1346
Joined: 3/17/2006
From: Tehachapi, CA, USA
Status: offline 		Whatever works thanks for the link. I flew mine today 6 flights. burned a tank and a half of gas runs good has a dead spot 3/4 throttle. but is flying good and i dont want to mess with it So i'll live with it for now. 18X6 prop worked pretty good lots of thrust. plane is still slow. but thats ok i'm getting use to it. may change props again back to smaller 16 inch cause of ground clearance. have a 16X10 i thought i would try out may give it that little bit of speed i'm looking for.

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RE: BCMAEngines - 5/3/2008 12:01:59 AM   
RR24


 

Posts: 71
Joined: 12/25/2006
From: Liberal, KS, USA
Status: online 		Fired up my BCMA 26cc engine today, i have had for a couple of months, and it ran very well, i ajusted the needles a little, but i am sure i will have to do it some more as i get used to it, since this is my first gasser. I was very pleased and think it will make a good engine

Wes

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RE: BCMAEngines - 5/3/2008 2:49:21 AM   
linkadrip



Posts: 1346
Joined: 3/17/2006
From: Tehachapi, CA, USA
Status: offline 		Wish you luck with your new engine. I changed my prop to a 16X10 today. Started to retune and it is cutting out now back to the drawing board. HAve to tune for peak then set my low then back the high off again. Hopefully that fixes it. Gonna get that bowman ring when they get it back in stock..

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RE: BCMAEngines - 5/3/2008 3:41:30 AM   
RR24


 

Posts: 71
Joined: 12/25/2006
From: Liberal, KS, USA
Status: online 		if you tach number later with 16x10 let us know what they are

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RE: BCMAEngines - 5/3/2008 5:39:14 PM   
rdrude


 

Posts: 24
Joined: 11/16/2005
From: Charlestown, IN, USA
Status: offline 		Ok need some guidance on my BCMA 26. I have it up and running with about half a gallan through it. Using an Xoar 16X8. Idles really well... around 1850-1900 RPM's. Engine is full RPM around 7600-7800. When I am slowly bringing up the throttle from idle to half throttle, it seems to have some hesitation. Once I am above half throtle, it has no hesitation. Rapidly increasing the throttle is smooth. It is only at slow idle to half that I notice the hesitation and some burble. Any ideas, or is this the norm with a new engine. This is my first gasser, and I must say that I am very happy with my dealings with Adam. Super nice guy and great customer service. Just need to rethink working with a gas engine from nitro...
Thanks in advance.
Rob

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RE: BCMAEngines - 5/3/2008 6:38:37 PM   
jbenker


 

Posts: 5
Joined: 4/7/2006
From: Somerset, TX, USA
Status: offline 		I had my SPE 26 in a 4 star 120 with a 16-8 APC prop. It flew OK but I wanted more vertical. (plane weighs 14 lbs. 10 oz.) I don't have another engine so I put the 26cc in a 4 star 60. I moved the flight servos to an area behind the pilot (made a hatch on the bottom side) and kept the ignition system up front. The systems are seperated 12 inches. I still had to add 3 oz. of lead to the front for balance. (this plane weighs 8 lbs 4 oz). Should work fineI hope

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RE: BCMAEngines - 5/3/2008 8:19:28 PM   
linkadrip



Posts: 1346
Joined: 3/17/2006
From: Tehachapi, CA, USA
Status: offline 		Let me just say this before youy tune your engine thinking that its the tuning. Always charge you ingnition battery before making adjustment. mine started cutting out the other day real bad and i thought it was the tuning and it wasn't so i messed up a perfectly goos tune. now i have to start over. which isnt to bad really. pretty simple.

i'll give tach numbers on 16X10 when i go to tune it again RR24..

quote:

Initial carb needle settings:

When you get a new carb and are not sure where the needle settings are it is best to start at a good ball park setting.

Turn both needles in all the way and back them out about 1 3/4 turns out. This will be a very rich setting but your engine will start at this point. Once it is running than you can lean them out.

Adjusting the low speed Needle:

Note: Make sure your engine is warmed up before you adjust the carburetor and your ingnition battery is fully charged.

Idle down for a few seconds then punch the throttle to wide open, if the engine loads down in the middle of the transition, lean the Low Speed needle 1/8 turn at a time until it's transition improves.

That will be as rich as it needs to be on the low end. Once you have that sorted out, adjust the idle trim.

You might have to richen the low end to get a good transition or to insure good down line breaking, but remember to keep the bottom end as lean as is practical. This will help insure a good midrange response.

Now retouch up the top end and check the idle once more. On a gas carb, the low end will affect the high end but the high will not affect the low.

Adjusting the high speed Needle:

Run the engine wide open and adjust the Hi-speed needle slightly rich of full RPM since the engine will further lean out in air.


from the BCMA web site..

My TwisT 150 is 10 Lbs and flys pretty good with this engine. 8lbs should be no problem pulling a 4 star 60..

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RE: BCMAEngines - 5/10/2008 3:05:18 PM   
Pit-Viper 1



Posts: 888
Joined: 9/14/2005
From: Westminster, CO, USA
Status: offline 		Well I spent some time up at Adams place the last couple days. Turned out that my carb was the culprit for my problems. While I was there I got to play around with his new line of motors a little. All I can say is, NICE!!! He didn't have the 28 yet, but it will be there sometime in the next few days or so. I believe he said that the 28 will turn an 16X8 prop @ 9200rpm. Big jump from the 8000rpm of the 26.

What I really like is that on the BCMA-42 pro and the MT-50 is that they sealed up the case on the back of the motor and this allows you to rotate the carb anywhere you need it due to the fact that it uses crank pressure to help draw fuel. I'm pretty sure thats correct, I was drooling over the new motors so my hearing may have been impaired slightly... Alls I can say is that my next project is going to be large as I am in aaww with the MT-50. Lots of guys at our field run the DA line of motors and I want this for that very reason. Also cause it looks "SO COOL"...

Anyway, he worked on my engine and when I returned the following day I could hear it singing when I pulled up. I was running a 17X4APC and we switched it to one of the his 18X6 JXF props he has, what a difference. These props are definitely made to push more air. I absolutely love the Xoar line of props, but I think that the JXF does push more air. I will know more for sure after my Xoar 18X6 shows up. I will do a thrust test to confirm.

What am I thinking??? It's nice outside and I got my plane ready to go and I'm sitting hear drinking coffee writing to you all... j/k Had to share that info with you..


Shane

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RE: BCMAEngines - 5/12/2008 11:58:56 PM   
Pit-Viper 1



Posts: 888
Joined: 9/14/2005
From: Westminster, CO, USA
Status: offline 		Well I took the Showtime out today to get some flying as it was nice today, a little windy though. Spent the first half of the day swapping the fuel lines and throttle servo due to the idle being very irregular. Would idle fine for a little bit then it would go to a high idle then go down to almost the point of stopping. Transition seemed to be fine. When I went to take off, just as it lifted off this is what I heard.

http://www.rcuvideos.com/item/TVM40LXWPTC24QQB

After getting it back to the pits I noticed it was leaking fuel around the throttle arm at a pretty good rate. I'm thinking an air leak is the culprit causing it to run the way it was in the video. Any ideas? Does anyone know if there is a o-ring around the throttle arm that I may be able to replace?


Shane

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RE: BCMAEngines - 5/13/2008 1:06:40 AM   
Flyer Freq



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Joined: 8/20/2002
From: Appleton, WI, USA
Status: offline 		I have never heard an engine oscillation that was that fast. I don't even know where to begin, except maybe checking all the bolts in that engine. It seems the oscillation in linear with engine speed. Is your throttle butterfly tight? There is no o-ring around the throttle arm.

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