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RE: BCMAEngines - 5/28/2008 4:46:29 AM   
OK2Fly


 

Posts: 259
Joined: 8/9/2007
From: Antioch, TN, USA
Status: offline
quote:

ORIGINAL: Pit-Viper 1

OK2fly,

I haven't had a chance to run it yet as I have been working. It will be a couple weeks before I get a chance. As far as the balance on the Showtime goes, it balances like it on a teator -totter. When I first did it it was a little too tail heavy so i moved one of the batteries forward just a tad and now the nose dives and it snaps really bad when you give any up elev. The guy I bought it from had put a TON of epoxy around the landing gear area. I'm thinking because of the amount and how close it is to the CG that it is effecting the way it balances. Not sure though, just a hunch..


Shane


The snapping thing is a whole 'nother issue, but I hear ya on the balancing.




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RE: BCMAEngines - 5/28/2008 12:07:49 PM   
shaneandmargy


 

Posts: 28
Joined: 11/5/2005
From: morwell, AUSTRALIA
Status: offline 		G'day all, just a little heads up! I'm running Adam's BCMA 26 with the WT433 carb which powers the 40. The figures I'm getting are; 7400rpm on a Xoar 17x8 prop . This engine is running spot on. It powers the 70 inch quite well. I'm very happy with the results . I'm going to try a 18x8 for more 3d action. I'll let you all know how it goes!

Cheers, Shane

(in reply to OK2Fly)
       Post #: 2152

RE: BCMAEngines - 5/28/2008 3:28:21 PM   
Pit-Viper 1



Posts: 888
Joined: 9/14/2005
From: Westminster, CO, USA
Status: offline 		I think I actually found the problem, one of my servos in the tail was dieing out and wasn't pulling the same as the other one. Hopefully it will take care of that, it was fine before.


Shane

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       Post #: 2153

RE: BCMAEngines - 5/28/2008 7:25:19 PM   
OK2Fly


 

Posts: 259
Joined: 8/9/2007
From: Antioch, TN, USA
Status: offline 		I really want a bigger carb now.


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Anderson

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       Post #: 2154

RE: BCMAEngines - 6/1/2008 2:08:34 AM   
bolkow


 

Posts: 2
Joined: 9/26/2004
From: bryan, TX, USA
Status: offline 		I have a USL with the BCMA26 with two gal of 30 to 1 thru it. Flys really nice, will go vertical. I used a MAS 16x8 and get 8200rpm. Idles at 1800 rpm.

Changed second two gallons to 40to1. Had to slightly lean carb, less oil on stab.

Today I put a velocity stack (angled cut) on it and the rpm dropped to 7800, leaned it out and got my 8200 rpm back, flew better with better vertical. No oil on the stab now.

Changed props to a APC 16x8, rpm dropped to 7800, adjusted carb high side and got 8100rpm, flys GREAT, goes vertical until you can't see it!

Love the BCMA26, perfect fit for the Ultra Stick 120 Light.

(in reply to OK2Fly)
       Post #: 2155

RE: BCMAEngines - 6/1/2008 2:19:17 AM   
OK2Fly


 

Posts: 259
Joined: 8/9/2007
From: Antioch, TN, USA
Status: offline 		Welcome to RCU bolkow.


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       Post #: 2156

RE: BCMAEngines - 6/3/2008 5:44:05 PM   
Flyer Freq



Posts: 906
Joined: 8/20/2002
From: Appleton, WI, USA
Status: offline
quote:

ORIGINAL: bolkow


Changed second two gallons to 40to1. Had to slightly lean carb, less oil on stab.



Hey bolkow! What oil are you using? Since switching to Penzoil at 40:1, oil residue has been all but gone with my 40CC.

Andy

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       Post #: 2157

RE: BCMAEngines - 6/4/2008 12:50:07 AM   
RR24


 

Posts: 71
Joined: 12/25/2006
From: Liberal, KS, USA
Status: offline 		I have the BCMA 26cc with xoar 16x8 and my best RPM is 7000, i have noticed some have had more than that, my carb. is a walbro wt 419, does this number seem about right? if not what should i look for?

(in reply to Flyer Freq)
       Post #: 2158

RE: BCMAEngines - 6/4/2008 1:27:32 AM   
linkadrip



Posts: 1347
Joined: 3/17/2006
From: Tehachapi, CA, USA
Status: offline 		Sounds about right on RPM that what mine was getting i put a 15X8 on it and now it gets up to 8100 rpm but i think alot has to do with the altitude here of 4000 feet. its hard to get any small engine to tune well here the barometric pressure here has alot to do with it as well. But i'm not getting the thrust i want with the 15X8 So im not going to fly it with that prop. going to goto a 16X6 and see how that works out, havent flow it with the new velocity stak yet. but should be an improvment.

That is if the wind ever quits blowing here seems like it has been blowing for a month now, if i had a glider or sloap flyer i could fly everyday.

If the engine is new it will take some time for it to break in as i run mine the rpms are getting better and tuning is better..

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RE: BCMAEngines - 6/4/2008 2:10:01 AM   
I B BUCK


 

Posts: 61
Joined: 2/28/2007
From: Neenah, WI, USA
Status: offline 		http://www.rcuvideos.com/item/JQHWVHSV0JW2BBQY

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       Post #: 2160

RE: BCMAEngines - 6/4/2008 2:48:35 AM   
bolkow


 

Posts: 2
Joined: 9/26/2004
From: bryan, TX, USA
Status: offline 		I am using Klotz oil, at 40 to 1. I used Craftsman oil to break in at 30 to 1.

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       Post #: 2161

RE: BCMAEngines - 6/4/2008 2:55:00 AM   
RR24


 

Posts: 71
Joined: 12/25/2006
From: Liberal, KS, USA
Status: offline 		We are at about 3100 here not sure how much gas has been run through it, as i bought it used, but i dont think it was much, it looked brand new, and i ahve only run about half a tank with it.

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       Post #: 2162

RE: BCMAEngines - 6/7/2008 1:57:38 AM   
ka8yyz


 

Posts: 20
Joined: 9/19/2005
From: Cassatt, SC, USA
Status: offline 		Guys. I need to pick some brains. I am having trouble with one of my 26's. I get it started, it runs great for about 5 minutes and then the engine starts lurching. I've been through the setup of the needlles from scratch, cleaned the carb screen, checked the diaphram, and am just out of ideas. I am running it with an XOAR 16x8, getting 7500 RPM. This engine has about 1-1/2 gallons through it.

Any help would be appreciated.
Thanks,
Jesse

(in reply to RR24)
       Post #: 2163

RE: BCMAEngines - 6/7/2008 2:51:12 AM   
jbenker


 

Posts: 5
Joined: 4/7/2006
From: Somerset, TX, USA
Status: offline 		Is your ignition battery fully charged?

(in reply to ka8yyz)