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RE: BCMAEngines - 4/13/2008 3:16:40 AM   
Flyer Freq



Posts: 912
Joined: 8/20/2002
From: Appleton, WI, USA
Status: offline 		I'm not familiar with the K&S fuel line. Many threads recomend this in the tank: http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXK824&P=ML

How flexable is that K&S fuel line?

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RE: BCMAEngines - 4/13/2008 5:08:36 AM   
OK2Fly


 

Posts: 289
Joined: 8/9/2007
From: Antioch, TN, USA
Status: offline 		Linkadrip, I hope you solved the problem.

I'm still having trouble trying to find the prop that provides the most thrust for 3D-ing the Showtime...


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Anderson

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RE: BCMAEngines - 4/13/2008 9:42:26 AM   
linkadrip



Posts: 1362
Joined: 3/17/2006
From: Tehachapi, CA, USA
Status: offline 		Flyer

Seems to be Very flexible fuel line with the clunk on it. It falls around in the tanks on my planes with no problems. The other fuel line you have a link to looks good too. I'm sure both work well i havent had any problems with the fuel lines getting hard or deterating but the line in the tank is new. maybe after a year, it probably should be replaced but i don't leave fuel in any of my planes after running them. So if you take the fuel out of the tank, the line shouldn't go bad as fast. But all the lines are new on the plane. I did a pressure check on the tank just to see if there were any leaks and there isn't it's sealed.

The engine ran fine on the ground before too. Only runs like a dog after i get it in the air and start to fly in a pattern. It always dies when in a turn too which i thought was weird flys fine straight but is a real dog. I have a twist 150 Bomber thats what everyone calls it. Full power and its just doggin along like a B52 need to strap some eggs on the bottom and have a release. So now everyone at the field calls it the 150 bomber. I had it full throttle and my frien goes is that it. his little tower trainer will fly circles around it very sad indeed, i have to fix it. So it will scream throught the air. cant have a 150 bomber. I know this engine can put out Some power just a matter of finding it. I know it's in there somewere I'm hoping.

But I havent been able to get the Bench mark Rpm of this engine with a 16X8 Prop eighther, I'm hoping as i run it more it will loosen up and go. Maybe if i put 100LL Avgas in it and mix it 50:1 it will start pumpin out the RPM's but that may not be a good idea probably melt it or some thing would happen. im running the regualr 85 octane and 40:1 at the moment in it. maybe it needs a boost of outlaw octane booster or the equivilent i think my earlier post of 9000 some rpm was an exageration wishful thinking..

Have to check that rpm again..

But I'll find out again when i take it out if changing the pitch helped any and retuning. But if this doesnt work then i'm not sure what to do. Could send it back to Adam i guess but i seriously dont think there is anything wrong with the engine. It starts fine runs up to full throttle and back to idel Nice and smooth on the ground. Should do the same in the air. But thats were it Changes in the air. But i'll try it agin if it doesn it again i'll mod that Hole in the baffle plate and run a line into the plane. Maybe thats the problem maybe the prop wash is effecting that little hole creating some kind of vortex behind the carb resulting in the baffle not being able to move back and forth correctly starving the engine causing it to die in turns.

Sorry started rambbling there. I'll just fly it again and then report back with my Experience.

OK2Fly
Wish i could help you There, mine is a 3D Plane too. But i'm currently just trying to get it to fly around Successfully with out bogging and dieing. I know i must have my tuning methods Correct. i start it up run it to full throttle Till i reach a max rpm with my Tach. then i back it off about an 1/8 of a turn. no real noticable drop in rpm. Then idel down and try a transition if it boggs when it try to goto full again i richen it a 1/4 at a time till i get a smooth transition from idel to full. i think thats the right method unless there is another.
But i too will be looking for a good 3D prop when i get it going good and will be glad to let you know what it is if i find the right combination.


< Message edited by linkadrip -- 4/13/2008 9:56:02 AM >

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RE: BCMAEngines - 4/15/2008 3:33:12 AM   
rompusflyer


 

Posts: 20
Joined: 11/1/2005
From: Round Rock, TX, USA
Status: offline 		FYI guys. I had the BCMA SPE26 in my new Cermark Pitts S2B. I tried many different props (16-18) and the best RPM performance I got was with a nylon 3 blade 16x8. It peak''d right at 10k. Though the engine ran really well I was not satisfied with this combination of plane/engine. It just didn''t have enough thrust to do any good aerobatics, ended up being more of a pattern plane. Guess it doesn''t matter anymore as on my fourth flight last weekend the radio lost communication and the plane is no longer with us. Bummer. So I''m currently installing this engine in a Cermark Sukhoi SU-31. I have high hopes for this plane/engine combo as it is going together very fast and is lighter than the Pitts. Not to mention it was only $168.

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RE: BCMAEngines - 4/15/2008 3:41:01 AM   
38


 

Posts: 570
Joined: 10/31/2004
From: Pittsburgh, PA, USA
Status: offline 		the right rpm for the engine is 6900 to 7500
you never want 10000 rpm on a gas engine

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RE: BCMAEngines - 4/15/2008 4:14:11 AM   
Flyer Freq



Posts: 912
Joined: 8/20/2002
From: Appleton, WI, USA
Status: offline 		All the RPM numbers do is allow you to compare one engine to another. I have seen identical props pull differently. Every prop, engine and airframe combination is unique. Don''t get too wrapped up in numbers, but by all means, use the numbers to tell you if your engine is in the right ballpark.

One other thing on prop selection. The high RPM numbers sound impressive, but you could toast an engine. I had a Webra 1.20 that I had two flights on. It was obvious it was not enough engine for the plane it was on. I sold it on ebXy. A week after the guy got it, I was called by the guy and he was mad that I sold him a pile of junk. He said the cylinder was all burned up and the piston ring was stuck in the piston groove. He had his "expert" on another line, telling me how little I knew when I broke this engine in. To make a long story short, they put the engine on a .60 sized Extra with only enough prop clearance for a 12" prop. They were running a 10" prop. Unbelievable! This was a long stroke engine, which should have easily spun a 17" prop. They fried it, trying to get RPM out of the engine that the engine was never designed to deliver. I guess what I am trying to say is if the prop you are running takes the engine outside the recommended RPM range, get another prop. If the plane won''t handle the prop that engine needs, don''t force fit the engine to the plane.

Really sorry to hear about the loss of the Pitts. That sucks! I expected that plane to cook!

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Lose not thy airspeed, lest the ground rise up and smite thee!
If you want to make God laugh, tell Him your plans

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RE: BCMAEngines - 4/15/2008 4:30:14 AM   
OK2Fly


 

Posts: 289
Joined: 8/9/2007
From: Antioch, TN, USA
Status: offline 		Enough about RPM...I want brands, diameters, and pitches!
[For the 26]


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Anderson

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RE: BCMAEngines - 4/15/2008 6:16:40 AM   
kerwin50


 

Posts: 424
Joined: 10/18/2006
From: winston, MO, USA
Status: offline 		Link after reading this thread and the twist thread I believe you are running the engine to lean.
If this is a new engine take it easy with her at 1st before trying to get max rpm. doing the mod to the diapram breather is not going to help that is only for cowled engines where the v stack sticks out of the cowl. Try running her richer on both the low and high speed. I have seen may a guy ruin a gas engine because he tuned it for max and when she got in the air she would lean out and seize.

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RE: BCMAEngines - 4/15/2008 9:38:27 AM   
linkadrip



Posts: 1362
Joined: 3/17/2006
From: Tehachapi, CA, USA
Status: offline 		Kerwin

Sounds like a good idea. it hasnt had that much time on it yet so i''ll be richening it up. It flew fine when it was running rich and after reading about richening and droping the rpm 500 or so i know i must be to lean. It makes perfect sence it runs fine on the ground then gets in the air and starts to cut out. like it has been leaned out to much. I dont think i have done any harm to it hopefully. So i''ll richen it up. The altitude here too is 4000 Feet, So the air is thinner then it would be at a lower level. I''m up about a 100 or so feet up when it start acting boggy and spitin and sputterin. it''s saying feed me more fuel damit.lol

I had to sit and think about it for awhile. before i put the velocity stack on it. i wasnt having the problem since it was running richer, but with a velocity stack more air is cramed into the carb So this would definetly make it leaner especially in the air since it moving and in a banked turn to the right is when it dies, usually trying to give it more throttle too.. And before it would cut out and do the same thing just at a higher altitude. It so hard to get the correct frame of mind on a gas enigne when your use to the Nitro. and switching back and forth from one to the other doesnt help things any.

I sure dont want it to seize up on me that would suck. so too much fuel is better then not enough. actually i think i should be seeing some smoke and i''m not seeing it. The weed eater i have smokes and my chainsaw Smokes. And the extra 330L with the GFI45 in it smokes. So this engine should be smoking some maybe not alot but some especially at full throttle. So its my lack of experience witch is casuing it to run like crap. pretty sure of that.

I havent been back out to fly it, since tuning it. So i''ll make sure i change it before i do.



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RE: BCMAEngines - 4/15/2008 11:52:37 AM   
cubmaster126


 

Posts: 150
Joined: 8/1/2006
From: havana, IL, USA
Status: online 		http://www.aero-works.net/store/detail.aspx?ID=288
I''ve already decided that a spe26 is the next engine buy, just tryin to find a good plane for it. What do you guys think about this one witha 26 in it? later guys

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RE: BCMAEngines - 4/15/2008 11:55:06 AM   
cubmaster126


 

Posts: 150
Joined: 8/1/2006
From: havana, IL, USA
Status: online 		And oh yeah, I''m an irrigation technician workin about 75 a week right now, that is one reason the QB series peaked my interest.

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RE: BCMAEngines - 4/15/2008 5:13:06 PM   
rompusflyer


 

Posts: 20
Joined: 11/1/2005
From: Round Rock, TX, USA
Status: offline 		That''s a really nice airplane and it''s nearly 400 bucks. However, if you want to save some dough, check out this Cermark Suhkoi SU-31: http://cermark.net/List.php?TID=14
They have a video of this plane with the SPE 26 in it. It cost me about $200 delivered. It showed up in perfect condition, no wrinkles at all. Large control surfaces. To me a perfect combo to cut my teeth on hovering and unlimited vertical. All you need to do is upgrade the linkage hardware and hinges for the control hardware. Also, you''ll need to get some longer motor mount extensions as the thrust point needs to be 6 1/8" from the firewall. As I mentioned above, I just bought one and it''s only going to take me about two evenings to put it together. There is anohter thread on this plane and BCMA engine in RC Universe, just do a search for Cermark Suhkoi SU-31. I''m going to outfit mine with a Xoar 17x8. I guess I need to stay away from the 10k RPM''s. (this is my first gas engine)

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RE: BCMAEngines - 4/15/2008 5:17:19 PM