RE: New SV Gassers  
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RE: New SV Gassers - 3/4/2008 12:07:06 AM   
freeonthree



Posts: 2562
Joined: 8/1/2004
From: Red Bluff, CA, USA
Status: offline 		Were still waiting for the rear crankcases for the SV50 and SV26. They cancelled the props for us, and we got the FTL45 today. Still waitin on the cdi box's and hall sensors. Gregs installing the FTL45 right now. I think it's going to be a keeper, it looks very good, and the mounts look very strong.

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       Post #: 576

RE: New SV Gassers - 3/11/2008 10:25:12 PM   
ozzmanace


 

Posts: 38
Joined: 7/27/2003
From: cherokee, NC, USA
Status: offline 		i've been told i have to use a pcm receiver. is this the case? i have a jr 9303 with a synth. module. what are you guys using. and have you had any gliches.

(in reply to freeonthree)
       Post #: 577

RE: New SV Gassers - 3/12/2008 4:03:23 AM   
freeonthree



Posts: 2562
Joined: 8/1/2004
From: Red Bluff, CA, USA
Status: offline 		I had a glitch until I secured the plug cap to the top fin of the head with a wire tie. I guess it stabilizes the metal sheeth from vibrating on the hex part of the spark plug, thats all I can figure, because if I remove it, I have a glitch. Odd but true...

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I dont crash, I just land hard

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       Post #: 578

RE: New SV Gassers - 3/12/2008 10:36:40 PM   
ozzmanace


 

Posts: 38
Joined: 7/27/2003
From: cherokee, NC, USA
Status: offline 		aren't you afraid of it popping loose and causing problems?

(in reply to freeonthree)
       Post #: 579

RE: New SV Gassers - 3/12/2008 11:57:38 PM   
Ed Cregger



Posts: 7744
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline 		Troubleshoot and test your gas powered models with an FM receiver. PCM hides interference by not permitting the servos to respond to the glitches that would severely affect an FM receiver, but, with the model very close to the transmitter, the system may appear to operate normally. As the model moves away from the transmitter, it's signal strength diminishes as the distance increases. At some point, your PCM system will cease to work at all.

It is best to make your model pass a ground range check with no more than a 10% loss in operating range with the engine running at various rpm settings utilizing the FM receiver. The same rules apply to an AM receiver, on the off chance that you have one in use.

Once the model has been cleaned up of extraneous RF emissions and your system is working properly, by all means feel free to use a PCM receiver in place of the FM receiver. Periodically check your model's ground range with the FM receiver. Also check your ground range with an FM receiver whenever your PCM system becomes sluggish in the air.

The jury is out on the new 2.4 GHz spread spectrum systems, but they have been performing well according to most folks. Still, do not get sloppy with your installation just because you are using a 2.4 GHz spread spectrum system (I'm addressing the group). Radios are radios and there isn't one in existence that doesn't perform better in a noise free environment.


Ed Cregger


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Artisan

"Flying models since the Fifties - I'll get the hang of this yet!!!"

(in reply to ozzmanace)
       Post #: 580

RE: New SV Gassers - 3/13/2008 12:09:32 AM   
ozzmanace


 

Posts: 38
Joined: 7/27/2003
From: cherokee, NC, USA
Status: offline 		thanks ed! you were very helpful

(in reply to Ed Cregger)
       Post #: 581

RE: New SV Gassers - 3/13/2008 12:17:37 AM   
ozzmanace


 

Posts: 38
Joined: 7/27/2003
From: cherokee, NC, USA
Status: offline 		i'm in a fairly new club with guys who are paying their dues in expierence. myself, i've been pylon racing for 7 years now, flying for 12 years. but am new to gas engines. also never used pcm. should i be concerned with getting pcm or is making sure my fm works without a glitch good enough.

(in reply to ozzmanace)
       Post #: 582

RE: New SV Gassers - 3/13/2008 12:30:55 AM   
Ed Cregger



Posts: 7744
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline 		By making the system work with an FM receiver, you are putting it to the test in a worst possible case scenario.

Note that both FM and PCM "receivers" utilize the same circuitry in their front ends, RF section, of the receiver. The real difference between FM and PCM is in the second part of the "receiver" - the decoder.

Decoders are not intelligent devices as yet, at least not in the average R/C system, whether FM or PCM. The day may come when AI (artificial intelligence) is applied to the algorhythms that operate the decoder(s), but we aren't there yet. In fact, we aren't even close because of cost/space/weight constraints.

The worst thing that a modeler can do in this regard is to give a PCM system much more credit at filtering extraneous signals than it truly deserves.


Ed Cregger




_____________________________

Artisan

"Flying models since the Fifties - I'll get the hang of this yet!!!"

(in reply to ozzmanace)
       Post #: 583

RE: New SV Gassers - 3/13/2008 12:53:27 AM   
freeonthree



Posts: 2562
Joined: 8/1/2004
From: Red Bluff, CA, USA
Status: offline 		Not really, I flew without it a couple of times before I figured it out, after I put the engine back on and forgot to put it back on. The only thing I could see that was different was the missing wire tie, so I put another one on, and my suttle in flight glitching was gone. That plane im sad to say is no more though. One of the guys at the flying site turned on a tx on channel 33 while I was coming in for a landing, and shot me down. He bought me a new Stearman, so im not too upset. I gotta say, that was a very helpless feeling, watching the plane go crazy without my help. Im very glad that the guy that shot me down has a good job. lol

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I dont crash, I just land hard

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       Post #: 584

RE: New SV Gassers - 3/13/2008 12:33:39 PM   
sean sutherland



Posts: 146
Joined: 9/5/2004
From: canungra, AUSTRALIA
Status: offline 		Sorry to hear Freeonthree that was a nice stearman what are you going to put your 26cc engine in now?

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       Post #: 585

RE: New SV Gassers - 3/14/2008 12:57:49 AM   
DaveP


 

Posts: 66
Joined: 1/12/2003
From: Salem, SC, USA
Status: offline 		Guys-

I'd like to try an SV26 on a Goldberg Extra 300 (68" span) kit, but I borrowed one to check against the plans and it's at least 1/2" too long. I could move the firewall back (not easy & cramps fuel space) or move the cowl forward, but it seems to me that the 1.25" long prop driver doesn't need to be that long. Has anybody tried or thought about shortening the prop driver?

I'd have no problem shortening or making a new driver if I could just get the old one off. I tried unsuccessfully to unscrew the prop stud with a 14mm socket, but couldn't grip the drive washer well enough to break it loose - after all, it's a borrowed engine, so I was limited to using a strap wrench so the owner would remain clueless.

Any hints on how to get the prop driver off? It IS a normal righthand thread, isn't it? "Righty-tighty, Lefty-loosy".

Yes, I know side-carb engines are shorter, but the SV26 has my wallet's attention.

-Dave

(in reply to sean sutherland)
       Post #: 586

RE: New SV Gassers - 3/14/2008 1:16:22 AM   
RC Extreme power



Posts: 983
Joined: 12/30/2001
From: AUBURN, GA, USA
Status: offline 		Two way's to get it off, One is impact wrench or you can stuff the cylinder with some small rope, It does come off counter wise and probably has some kind of lock tight on it.

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       Post #: 587

RE: New SV Gassers - 3/14/2008 2:01:30 AM   
DaveP


 

Posts: 66
Joined: 1/12/2003
From: Salem, SC, USA
Status: offline 		Thanks for the input, Milton. I hadn't thought of the old rope trick. I've stuffed car cylinders to keep the valves in place, but haven't tried rope to block crankshaft motion. Sure beats jamming a screwdriver in the exhaust port!
-Dave

(in reply to RC Extreme power)
       Post #: 588

RE: New SV Gassers - 3/14/2008 2:24:09 AM   
RC Extreme power



Posts: 983
Joined: 12/30/2001
From: AUBURN, GA, USA
Status: offline
quote:

ORIGINAL: DaveP

Thanks for the input, Milton. I hadn't thought of the old rope trick. I've stuffed car cylinders to keep the valves in place, but haven't tried rope to block crankshaft motion. Sure beats jamming a screwdriver in the exhaust port!
-Dave


Never tried stuffing car clylinders, Used to have a adapter for spark plug hole and used air pressure to hold valves in place.

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       Post #: 589

RE: New SV Gassers - 3/15/2008 12:25:58 AM   
Ed Cregger



Posts: 7744
Joined: 1/31/2002
From: Ringgold, GA, USA
Status: offline 		The potential for being shot down is why I went to six meters originally. Now I have gone to 2.4 GHz. So far, so good.

Flying simple aircraft, such as the GP Stearman, an inexpensive Futaba FASST 6 Tx/Rx should be enough to get you going using your old servos, etc. I have two of them, plus more complicated stuff from Spektrum (6 & 7) and some third party modules for JR gear. I'm going to unload the Spektrum stuff. I prefer Futaba's method of spread spectrum, at least theoretically. Much more difficult to have a shoot down with that type of frequency hopping.

The Spektrum 6 and 7 are new in box. I'm not opposed to trading for kits, engines, etc....


Ed Cregger


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Artisan

"Flying models since the Fifties - I'll get the hang of this yet!!!"

(in reply to freeonthree)