RE: New 53cc engine now available  
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
       

All Forums >> RC Airplanes >> Giant Scale Aircraft - 3D & Aerobatic >> WildHare R/C Support >> RE: New 53cc engine now available
Page: <<   < prev  13 14 [15] 16 17 18 19 20 21 22   next >   >>  

Login
Message << Older Topic   Newer Topic >>
RE: New 53cc engine now available - 8/1/2007 7:34:31 PM   
Tired Old Man


 

Posts: 11367
Joined: 2/25/2002
From: Central, CA, USA
Status: offline 		Takes me about 4 or 5 flips, choked, for the first pop of the day, then a few more, unchoked, for the start. After that it's pretty much a one flip wonder for the rest of the day.

_____________________________

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

(in reply to bluemagic98)
       Post #: 351

RE: New 53cc engine now available - 8/5/2007 4:42:57 PM   
Al Lewis


 

Posts: 1791
Joined: 7/5/2005
From: Port Orchard WA, USA
Status: offline 		My routine is the same as yours Pat. The funny part of it is watching the guys trying to start their DA-50s at the same time, under the same conditions. They don't say anything but I know it's burning them that my inexpensive engine will kick right over and have a better mid-range. All I ever get is, "Well, we'll see how long it lasts." I'm really loving this engine.
On another note, is there any chance that a reed plate that is too stiff could be causing the "spitting problem" mentioned previously? I thought about this quite a bit as mine doesn't spit at all. That was the only variable I could come up with. Just a possibility worth looking into. I know they use to change out the reed plates on the 2-stroke MX bikes to get more performance. I thought perhaps reeds made from a different roll of steel could be slightly stiffer causing this. If the reed were too stiff it may be fighting the vacuum too much at which point it could create a rythymic occillation and bounce fuel droplets back into the venturi. Just a thought.

< Message edited by Lou55 -- 8/5/2007 4:51:26 PM >

_____________________________

Take Offs are Optional, Landings are Really Nerve Racking!! Al Lewis AMA #821623

(in reply to Tired Old Man)
       Post #: 352

RE: New 53cc engine now available - 8/5/2007 10:54:08 PM   
Tired Old Man


 

Posts: 11367
Joined: 2/25/2002
From: Central, CA, USA
Status: offline 		I've tried two different 3mm engines now and neither one of them is a "spitter". I'm thinking it may have more to do with needle adjustments, but I'm not certain by any means.

Funny thing about these engines. They are not high revvers in the rpm area, but are not lacking in power. Both engines performed within a percentage point or so of each other. Just like a 3W they make more torque than rpm. Here's where it gets interesting. In experimenting with a couple of props, mostly due to dumb thumbs and "tipping" my best one, I found that the 3mm REALLY likes a wide blade prop. How wide? How about of all things a 24-8 Zinger that was cut down to a 22-8 and squared at the tips. That only leaves the section of the blades that make a very stiff and wide paddle. Best performance out of the engine I've seen so far is with a w-i-d-e blade prop. I wish I had brought the MSC to the field. I think it would have been awesome.

You guys might want to try expeimenting a liitle with blade widths. The MSC is the widest by far, and very stiff. It could be well worth it to try a couple of them in various lengths to see how it works out. The engine appears to like that type of arrangement. Word of caution: cutting down of a Top Flite prop make things become exceedingly loud in a heartbeat. They are very flexible regardless of the length.

_____________________________

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

(in reply to Al Lewis)
       Post #: 353

RE: New 53cc engine now available - 8/5/2007 11:08:31 PM   
TheFoxes


 

Posts: 106
Joined: 8/29/2003
From: Brooklyn Park, MN, USA
Status: offline 		I have the spittle bad - and as far as I can tell the needles are right on the money. It turns the 22X8 bunny 6900 static now. Great transition. Rips the prop in level flight (like no engine I have ever heard) and will fly 20 minutes on 24 ounces (mixed throtle settings). Very little exhaust residue and it's still running on 32:1.

I just got a new carb from Tom to try - but my gut says the reed block is messed up somehow. Portions of the block on the reed side are a little rough looking. The surface the reeds set against looks smooth, but I can see by the change in translucantcy of the reeds themselves that they dont seal against the block at their tip without applying light pressure. Granted, the backpresure should be more than enough to close them up, but who knows how much might get through there in the fraction of a second when vacuum turns to case compression. Anyway, too wet to experiment today. Will try on Monday.

ff

(in reply to Tired Old Man)
       Post #: 354

RE: New 53cc engine now available - 8/6/2007 12:03:19 AM   
rctom



Posts: 5132
Joined: 5/8/2002
From: Flower Mound (near Dallas), TX, USA
Status: offline 		I am pretty sure it has something to do with the reed block, because most run good and occasionally I see one that needs the reed block inverted, and that seems to do the trick.

I have suggested to them some changes, I believe they are working on it. Meanwhile the engines will run well one way or the other.

TF

(in reply to Al Lewis)
       Post #: 355

RE: New 53cc engine now available - 8/6/2007 3:05:09 AM   
Tired Old Man


 

Posts: 11367
Joined: 2/25/2002
From: Central, CA, USA
Status: offline 		Makes you wonder if some oil from the original running process didn't dry on the back of the reeds. You'd think that any dried oil would dissipate after running the engine again but you never know. They do run good though.

_____________________________

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

(in reply to rctom)
       Post #: 356

RE: New 53cc engine now available - 8/6/2007 10:25:48 PM   
TheFoxes


 

Posts: 106
Joined: 8/29/2003
From: Brooklyn Park, MN, USA
Status: offline 		Got the engine tuned up with new carburator and tested today. Flew for about 25 minutes total.

Still have the spittle. Baffle in cowl didn't help either - but did cost about 300rpm on the top end.

I also sealed up the aileron gaps sine the last time I flew. Now it seems like it won't harrier (etc) as steady. Does that make sense? Could also be the weight of the baffle up front? But four square inches of 1/8" ply shouldn't make that much difference, should it?

ff

(in reply to Tired Old Man)
       Post #: 357

RE: New 53cc engine now available - 8/7/2007 12:46:37 AM   
Tired Old Man


 

Posts: 11367
Joined: 2/25/2002
From: Central, CA, USA
Status: offline 		The baffle could easily effect the rpm, and the rpm could effect the harrier in 2 ways. One is a power loss and the other is the way the propeller is or isn't moving air like it had. I get wing rock in a harrier with sealed hinge gaps. I hadn't tried the plane without sealed gaps. The next thing I was going to try was reflexing the ailerons up about 10 degrees when in a harrier. This has worked many times to clean up wing rock in some plane types.

For the spitting you might considr trying a slanted velocity stack and play with the slant direction a little. Zenoah and B&B Specialties sell them.

_____________________________

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

(in reply to TheFoxes)
       Post #: 358

RE: New 53cc engine now available - 8/7/2007 1:16:41 AM   
TheFoxes


 

Posts: 106
Joined: 8/29/2003
From: Brooklyn Park, MN, USA
Status: offline 		I picked up a Zenoah V-stack to try - but it's too long to fit in the cowl, and I'm not about to punch a hole in the cowl (or shorten the stack) for a "maybe" fix. Tom's sending a new reed block.

Thanks for the insight. I'm going to move the CG back a touch and try again with the harrier. I've been flying it a little nose-heavy getting used to it. I'll try the aileron deflection too. I have flaps (both directions) set up on a slider already. Now I might actuallly have a reason to use them!

ff

(in reply to Tired Old Man)
       Post #: 359

RE: New 53cc engine now available - 8/7/2007 8:10:47 PM   
skyhawk007


 

Posts: 44
Joined: 8/25/2005
From: QLD, AUSTRALIA
Status: offline 		Hi all I just got my hands on one of these little beasts and have a quick questions for you, as it is my first time with a large gas motor I am unsure of whats right and wrong but when I attach the spark lead it doesent seem very secure and im sure with a little vibration it will fall straight off, is there a trick to connecting it or something like removing the small ring first?

All help would be great.

Cheers

(in reply to TheFoxes)
       Post #: 360

RE: New 53cc engine now available - 8/7/2007 8:17:30 PM   
TheFoxes


 

Posts: 106
Joined: 8/29/2003
From: Brooklyn Park, MN, USA
Status: offline 		Mine just pushes on - hard.

ff

(in reply to skyhawk007)
       Post #: 361

RE: New 53cc engine now available - 8/7/2007 11:30:32 PM   
Tired Old Man


 

Posts: 11367
Joined: 2/25/2002
From: Central, CA, USA
Status: offline 		Push on it until it snaps in place. They don't fall off unless they are not fully seated.

_____________________________

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

(in reply to skyhawk007)
       Post #: 362

RE: New 53cc engine now available - 8/8/2007 3:40:14 AM   
Al Lewis


 

Posts: 1791
Joined: 7/5/2005
From: Port Orchard WA, USA
Status: offline 		While you're waiting, pull the reed off of the block and turn it over and see how it does. If the reeds are bowed reversing them may allow them to close completely and solve the problem. If the reed is bowed in the middle with the end stuck up it could cause a problem but if the bow is in the middle with the end down it may suck down and solve the problem. It wouldn't be able to ocsilate. Worth a try. I still think the reed is the problem and not the block.

_____________________________

Take Offs are Optional, Landings are Really Nerve Racking!! Al Lewis AMA #821623

(in reply to TheFoxes)
       Post #: 363

RE: New 53cc engine now available - 8/8/2007 5:21:06 AM   
TheFoxes


 

Posts: 106
Joined: 8/29/2003
From: Brooklyn Park, MN, USA
Status: offline 		I'm not really in the mood to re-do my servo linkages right now. I'm going to wait and see what the new block does. But thanks for the thoughts.

ff

(in reply to Al Lewis)
       Post #: 364

RE: New 53cc engine now available - 8/14/2007 3:36:45 AM