RE: BME 115 Any Field Reports?  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
  Printable Version
       


RCGF 20cc Gasoline Model Airplane Engine
Seller:  jewillis2
Details:   $214.88   |  1/6/2009   |  Classified Ad
We will rotate YOUR AD in this spot if you select "Forum Featured" when placing or editing your ad!

All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Gas Engines >> RE: BME 115 Any Field Reports?
Page: <<   < prev  9 10 [11] 12 13 14 15 16 17 18   next >   >>  

Login
Message << Older Topic   Newer Topic >>
RE: BME 115 Any Field Reports? - 5/8/2007 4:20:20 AM   
altavillan


 

Posts: 1236
Joined: 10/24/2004
From: Altaville, CA, USA
Status: offline 		RTk took some heat readings on my 115 sat. after first flight of the day. 270 front 310 rear. My baffle is just a seal across the front of the cowl opening and close around the front of the engine, nothing more. I'm running the new carb with a A.I. snorkel, KS cans on short 7"+-(Question for Dick H. next post) headers, tube off the diaphram is 1"long silicone hose to a piece of brass tubing with the end crimped almost closed. First flight of the day it takes the engine about 3 to 4 minutes of flying or one minute of huvering<----(Ask SS) to warm the engine till all hesitations go away. The engine wants to be lean on the low. As you run it you will set it lower and lower. And it wants to run hot. Not hot on the high side but hot. The carb does not like long tubes off the diaphram. Mines in a Katana with small cowl openings up front and large exit area. About 40+ perfect flights on it now. And still tuning, have a little more to go leaning the low and not at full advance on the ignition yet prob. running 24 degrees on CH. Opti2 syn oil. http://www.opti2-4.com/

_____________________________

I didn''t put the bullet in the fire and you quit talking about my mother! "Cosby, Shop Class, 1968 or so"

(in reply to FreedomFlier)
       Post #: 251

RE: BME 115 Any Field Reports? - 5/8/2007 4:23:59 AM   
altavillan


 

Posts: 1236
Joined: 10/24/2004
From: Altaville, CA, USA
Status: offline 		Question for Dick H. If one header is shorter than the other. So that the exhaust comes out evan, in a down line will one cylinder act like a jake brake and the other act like a supercharger?

_____________________________

I didn''t put the bullet in the fire and you quit talking about my mother! "Cosby, Shop Class, 1968 or so"

(in reply to altavillan)
       Post #: 252

RE: BME 115 Any Field Reports? - 5/8/2007 4:39:37 AM   
RTK


 

Posts: 4089
Joined: 4/20/2003
From: CENTRAL , CA, USA
Status: offline 		FreedomFlier--I personally would dump the top half of the baffling, (upper piece) when I added that it made "my" engine temps soar and sloppied up my mid range. My first design was just the bottom half and it worked better than anything I tried. I never should have changed. I warned everyone "not" to baffle up to the cowl on both top and bottom. All my pics are in the WH forum along with comments.
Currently I am running no baffles (experimenting) but I had to box the original carb to stop air flow over the venturi which made my engine bog in KE and quick AOA changes. With the new carb the box is to low so I am back to the KE bog. I am going to try one of those snorkel things.
I tend to think your problem is air flow related. When I flew this weekend (removed/added parts) the needles acted completely different, one time the were ultra sensitive the next you could twist them with little response all by changing the air flow around and below the carb.

(in reply to FreedomFlier)
       Post #: 253

RE: BME 115 Any Field Reports? - 5/8/2007 4:44:35 AM   
RTK


 

Posts: 4089
Joined: 4/20/2003
From: CENTRAL , CA, USA
Status: offline 		altavillan--One time you had a little larger spread But your engine runs great and pulls well, a little too quiet though

< Message edited by RTK -- 5/8/2007 5:06:14 AM >

(in reply to RTK)
       Post #: 254

RE: BME 115 Any Field Reports? - 5/8/2007 4:54:22 AM   
altavillan


 

Posts: 1236
Joined: 10/24/2004
From: Altaville, CA, USA
Status: offline 		Neighbor "lady" has a tendency to run over loud planes and their owners ,ask SS

_____________________________

I didn''t put the bullet in the fire and you quit talking about my mother! "Cosby, Shop Class, 1968 or so"

(in reply to RTK)
       Post #: 255

RE: BME 115 Any Field Reports? - 5/8/2007 5:11:00 AM   
AmpAce


 

Posts: 81
Joined: 5/22/2006
From: Flyer's Paradise, USA
Status: offline 		Sounds like a real intriguing story there! How about it Silver Surfer-------?

AmpAce


"Neighbor "lady" has a tendency to run over loud planes and their owners ,ask SS "

(in reply to altavillan)
       Post #: 256

RE: BME 115 Any Field Reports? - 5/8/2007 5:35:11 AM   
RTK


 

Posts: 4089
Joined: 4/20/2003
From: CENTRAL , CA, USA
Status: offline 		It's a doosy, don't know if his lawyer will let him talk about it in public yet

(in reply to AmpAce)
       Post #: 257

RE: BME 115 Any Field Reports? - 5/8/2007 6:22:00 AM   
Tired Old Man


 

Posts: 12356
Joined: 2/25/2002
From: Central, CA, USA
Status: online 		The case was settled out of court two years ago. She dropped the case against me. I had to promise not to kill her if she ever did it again.

Seriously, I've told the story in print in the AMA forum once. Takes forever to present all the background and later facts and actions. Let's just say a neighbor to a field got out of control, ran over a plane or two with her pick up, caused great bodily harm to the land owner, again with her pick up, and later sued me because I told her she'd die if she moved a muscle. She elected to drop the suit after a few (read as several years of) legal discussions. The neighbor is very quiet these days.

Altavillian still tinks of a certain maneuver as a vacuum cleaner not something a helicopter would do

< Message edited by Silversurfer -- 5/8/2007 4:51:27 PM >

_____________________________

If you can''t fix it with a hammer, you have an electrical problem.

(in reply to RTK)
       Post #: 258

RE: BME 115 Any Field Reports? - 5/8/2007 12:44:52 PM   
Pontiac_40


 

Posts: 117
Joined: 4/25/2002
From: Fairfax, VA, USA
Status: offline 		Freedomflier, try running the fuel tubing from the diaphram to inside your fuse to stabalize the pressure changes. It has worked in some cases. Let us know the results

_____________________________

Fly and let fly

(in reply to FreedomFlier)
       Post #: 259

RE: BME 115 Any Field Reports? - 5/8/2007 9:03:40 PM   
Tired Old Man


 

Posts: 12356
Joined: 2/25/2002
From: Central, CA, USA
Status: online 		V-2 Carb Throttle Lever Important service note.

If this has been covered already, my apologies, but it's worth going over again.

For those that have received the 115 with the upgraded carb that has the long throttle lever on it, take a note. This lever can be removed and rotaed to be in either an "up" or a "down" position. Whichever you choose, and even if you choose to leave it as it came from BME, remove the lever retaining screw and add some Locktite to the threads to secure it. As it sits it can vibrate loose leaving the operator with a bit of a dillema in flight. You'll either have to shut the engine down in flight in one manner or another or fly out the tank at the last throttle setting. Hopefully it's above idle.

Easy to do, just be certain to do it.

< Message edited by Silversurfer -- 5/8/2007 10:08:42 PM >

_____________________________

If you can''t fix it with a hammer, you have an electrical problem.

(in reply to Pontiac_40)
       Post #: 260

RE: BME 115 Any Field Reports? - 5/8/2007 9:29:19 PM   
RTK


 

Posts: 4089
Joined: 4/20/2003
From: CENTRAL , CA, USA
Status: offline 		Good reason to use a CHOKE servo SS

(in reply to Tired Old Man)
       Post #: 261

RE: BME 115 Any Field Reports? - 5/8/2007 10:12:12 PM   
Tired Old Man


 

Posts: 12356
Joined: 2/25/2002
From: Central, CA, USA
Status: online 		Better to have the assembly correct when it leaves the factory. There's no reason for this and the loose prop shaft that came with my engine. Dammit man, they've had plenty of time to figure out how to do it right, and a simple checklist for assembly items is all it takes to cover all the bases. Duh!

If you're not going to check your work then provide a note telling the customer that they'll have to do it instead. Or have I missed something here?

_____________________________

If you can''t fix it with a hammer, you have an electrical problem.

(in reply to RTK)
       Post #: 262

RE: BME 115 Any Field Reports? - 5/8/2007 10:23:25 PM   
dick Hanson



Posts: 10268
Joined: 12/12/2001
From: slc, UT, USA
Status: online
quote:

ORIGINAL: altavillan

Question for Dick H. If one header is shorter than the other. So that the exhaust comes out evan, in a down line will one cylinder act like a jake brake and the other act like a supercharger?


OK - a bit of humor?
maybe a Bone E Fied Ex Spurt can run tests to see wha happens and to include some blah blah figures--
short story:
the total length of each system is for a given rpm OR- tone (jes like a trombone -really.)
if one side is tuned to be spot on at x cycles per second --and the other is at x+ 500 cycles per second -- it doesn't take much figgerin to see that one is in "PHASE -while the other is not - and can change places as to which is best --as rpms change .
calling one a brake and the other a supercharger --is not really descriptive enough.
What really helps is simply trying,recording various setups to see which one matches your needs
One more thing
tho the displacement of the cylinders may be the same ---- the ability of each side to breath may be different --
nasty that --
in theory - it may prove helpful to slightly mismatch pipes -- this can -(really) change temperature as one cyclider runs hotter whilst producing more power --then less as it goes up in smoke.
that is an ugly way of trying to fix the problem
The MVVS /Evolution 116-- has a pretty fancy crankcase shape --intended to balance the flow and it seems to really work ., At least the setup I have run is well balanced
When it is all said n done - you should try to balance temps in the cylinders - this will -more or less -balance the work performed by each cylinder .
Mt 160 Super runs very close to same temps -the little poke in n read meters show -about 5 degrees difference - The engine is well baffled to force flow thru the fins -including rear of the fins (backside of cylinder) - thre are lots of ways to do this -just cobble up something that makes inlet flow travel thru the fins . On the old in line Tigre - we lowered the compression on th hot running cylinder - but it was all a POS anyway -wretched design.




< Message edited by dick Hanson -- 5/8/2007 10:41:04 PM >

_____________________________

I am watching you
Libby

(in reply to altavillan)
       Post #: 263

RE: BME 115 Any Field Reports? - 5/8/2007 10:29:57 PM   
RTK


 

Posts: 4089
Joined: 4/20/2003
From: CENTRAL , CA, USA
Status: offline
quote:

ORIGINAL: Silversurfer

Better to have the assembly correct when it leaves the factory. There's no reason for this and the loose prop shaft that came with my engine. Dammit man, they've had plenty of time to figure out how to do it right, and a simple checklist for assembly items is all it takes to cover all the bases. Duh!

If you're not going to check your work then provide a note telling the customer that they'll have to do it instead. Or have I missed something here?


On the prop shaft, I believe you mean stud?? In the manual it says to either use silicon or lock-tite it at a specific length in relation to the prop hub thickness. No mention of checking the throttle arm, but I usually lock-tite everything that I feel needs to be anyway.
Remember we are flying large gassers

(in reply to Tired Old Man)
       Post #: 264