RE: mvvs 1.60 gasser carb #'s (Full Version)

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hollerp89 -> RE: mvvs 1.60 gasser carb #'s (9/9/2006 7:37 AM)

i AM LOOKING FOR A MVVS .09 NEEDLE VALVE THROTTLE KIT. OR CLOSE TO THAT SIZE ,
THANK YOU BOB



FentonFlyer -> RE: mvvs 1.60 gasser carb #'s (9/9/2006 10:37 PM)

Pe or Dick,

Is the APC 17x8N a good prop for the 26 on a tuned pipe?

Thanks



rmh -> RE: mvvs 1.60 gasser carb #'s (9/9/2006 10:52 PM)

depends on application
so far - and I have used my setup on the Showtime and Funtanas, the 18x6 props which spin easily seem best - but that might be a good prop an a fast sporty setup - say a scale racer where you want it to really move-or if you like old style pattern where it really cooks - should be great .



pe reivers -> RE: mvvs 1.60 gasser carb #'s (9/9/2006 11:52 PM)

The APC prop 18x8N spins in excess of 8000 rpm, so I wold use at least a 10"pitch if you are after speed. (16x12 or 17x11)
For thrust, and power reserve (needed for quick spool-up in 3D) the 18x6 is best.
For normal sports, use 18x8 or 18x10
APC does not provide the best thrust in these sizes. In my tests, it performed worst of all
(compared to Menz- and clones, Mejzlik, Zinger)



FentonFlyer -> RE: mvvs 1.60 gasser carb #'s (9/10/2006 1:00 AM)

I'm using the 26 on a CMP Giles 202. I have an 18x6 menz, an 18x6 Pro Zinger, an 18x6 Top Flight or the APC 17x8. I guess for starters, I'm looking for more pattern speed than 3D. Also, the plane is a little overweight, so I thought the 8" pitch would help with keeping speed up a bit on final.

Any more thoughts?

Thanks



rmh -> RE: mvvs 1.60 gasser carb #'s (9/10/2006 1:07 AM)

the pitch being lower is actually better for landing- keep revs up and then control final speed with throttle -NOT elevator



RysiuM -> RE: mvvs 1.60 gasser carb #'s (9/10/2006 7:15 AM)


quote:

ORIGINAL: preivers
APC does not provide the best thrust in these sizes. In my tests, it performed worst of all


APC is very heavy spooling up much slower than CF or wooden props - not good for 3D. I run 18x6 Mejzlik on Powerline Hobbies Edge 540, and this is the happiest prop for this plane.



killuminati -> RE: mvvs 1.60 gasser carb #'s (9/11/2006 2:57 PM)

This being my first gas engine, I see all the plastic pustrods. Is my metal pushrod going to be a problem? I plan on starting it for the first time tonight. Should I just see what happens or go ahead and find a plastic pushrod. My next question would be where to get one.



pe reivers -> RE: mvvs 1.60 gasser carb #'s (9/11/2006 10:07 PM)

Look for Sullivan Golden rod



killuminati -> RE: mvvs 1.60 gasser carb #'s (9/11/2006 10:12 PM)

So no go on the standard metal rod?



pe reivers -> RE: mvvs 1.60 gasser carb #'s (9/11/2006 11:12 PM)

A metal rod may cause interference on the radio. Do not use them for throttle or choke.



RysiuM -> RE: mvvs 1.60 gasser carb #'s (9/12/2006 12:25 AM)

quote:

ORIGINAL: killuminati
So no go on the standard metal rod?


I use a combination. Inside both ends of 10-15 inch golden rod I screwed in a short piece (2 - 1.5 inch) of metal threaded rod. The golden rod is running inside the plastic sleve but both loose ends (without the sleve) do not bend because of the metal inserts. This way I have thread on both ends for clevis to put on, and the part of golden rod between sleve and the servo horn (or throttle arm) and th sleve doesn't bend for crisp throttle control. And what is important, the plastic rod doesn't melt from the engine heat.[;)]

You can see the throttle setup on my MVVS 1.6 in Powerline Hobbies Edge below



jamiem75 -> RE: mvvs 1.60 gasser carb #'s (9/12/2006 12:36 AM)

fiberglass or carbon fiber pushrods also work very well. The dave brown fiberglass rods that tower sells are what I used.



killuminati -> RE: mvvs 1.60 gasser carb #'s (9/13/2006 2:49 PM)

Gold-n-rod worked great thanks.



devcon9 -> RE: mvvs 1.60 gasser carb #'s (9/13/2006 3:08 PM)


quote:

ORIGINAL: RysiuM


I use a combination. Inside both ends of 10-15 inch golden rod I screwed in a short piece (2 - 1.5 inch) of metal threaded rod. The golden rod is running inside the plastic sleve but both loose ends (without the sleve) do not bend because of the metal inserts. This way I have thread on both ends for clevis to put on, and the part of golden rod between sleve and the servo horn (or throttle arm) and th sleve doesn't bend for crisp throttle control. And what is important, the plastic rod doesn't melt from the engine heat.[;)]

You can see the throttle setup on my MVVS 1.6 in Powerline Hobbies Edge below


That is a very neat throttle linkage set up[sm=thumbs_up.gif]
Thanks for sharing.

Good flying
Tony



FentonFlyer -> RE: mvvs 1.60 gasser carb #'s (9/15/2006 12:45 PM)

I got the first flight on mine last night. The engine was bought used and was advertised to have at least 5 gallons through it so it's definately broke in. I'm running 40:1 Klotz model lube and I'm getting lots of black "spooge". It's actually seeping around the end cap of the tuned pipe. It's richened to about 8400 static peak. I use this same mix in my Brison 2.4 with out the "spooge". Is this too rich or am I using the wrong oil? Any suggestions?



pe reivers -> RE: mvvs 1.60 gasser carb #'s (9/15/2006 10:44 PM)

You are running the wrong oil.
The engine requires fully synthetic two stroke racing oil. The oil should be suitable for premixing at 1:30 to 1:40
Suitable oils are Mobil 1- 2T, Motul 800, redline two stroke racing, Amsoil Dominator, Putoline RS959, etc etc
Klotz model oil does not fit that bill and will damage your engine.
Apart from that, it takes about one hour running to achieve a total oil change inside the engine, during which the engine is not feeling well at all and may react by showing symptoms of it's unhappiness. Push the engine too hard in this hour, and you will cause damage.



LUDS96 -> RE: mvvs 1.60 gasser (9/16/2006 11:57 PM)

The Fact of the matter is the sound wave makes it down the pipe faster! It is then reverbed back. So you are tuning the pulse of the sound wave back down the pipe to pressurize the combustion chambers fresh charge. Like super charging!



Charley -> RE: mvvs 1.60 gasser (9/17/2006 1:58 PM)

quote:

ORIGINAL: LUDS96

The Fact of the matter is the sound wave makes it down the pipe faster! It is then reverbed back. So you are tuning the pulse of the sound wave back down the pipe to pressurize the combustion chambers fresh charge. Like super charging!


Regarding your first sentence above: faster than what?

CR



LUDS96 -> RE: mvvs 1.60 gasser carb #'s (9/18/2006 4:25 AM)

When the exhaust port opens the hot burnt gasses start down the Pipe. At the same time the sound wave from the detonation starts down the pipe the sound pressure wave bounces off the pipe and returns back up the pipe pressurizing the cylinder.



rmh -> RE: mvvs 1.60 gasser carb #'s (9/18/2006 5:34 AM)

The sound starts from the pressure release of the exhaust port opening- the actual exploding of the fuel is not heard.
This why it is referred to as a champagne cork effect.
That pressure wave moves quickly - builds pressure in the head pipe - then - depending on what the "pipe' looks like -- the pressure "rebounds" --hopefully in a time frame which has first pulled the cylinder empty (and thereby pulling in a more dense mixture) then the "rebound" acts as a valve stopping the fresh charge from spilling down the pipe along with the spent gasses. This rebound or pressure wave or whatever you want to call it along with the initial out rushing gasses - --simply fills the cylinder more completely with fresh mixture
It is a frequency synch'd with the rpm (naturally) and acts as a pump There are lots of fine write ups and nice formulas for making a tuned pipe
for our general use - much of this info is nice reading but leaves you with a setup ,typically peaky and NWAS.
The actual devices which work extremely well for us - often look nothing like the textbook pipes.



Charley -> RE: mvvs 1.60 gasser carb #'s (9/18/2006 2:57 PM)

quote:

ORIGINAL: LUDS96

When the exhaust port opens the hot burnt gasses start down the Pipe. At the same time the sound wave from the detonation starts down the pipe the sound pressure wave bounces off the pipe and returns back up the pipe pressurizing the cylinder.


You need to read up on how tuned exhausts work. If you're near a college, take a ride out to their library. I found a lot of good info that way. Static mounted engines in industrial applications often used tuned exhaust systems.

CR



rmh -> RE: mvvs 1.60 gasser carb #'s (9/18/2006 3:27 PM)

A cullage -- I am not familiar with those things either

On the farm -we just tossed the culls out for feed. Cereally tho - Understanding the theory is important .



Charley -> RE: mvvs 1.60 gasser carb #'s (9/18/2006 11:15 PM)

quote:

ORIGINAL: dick Hanson

A cullage -- I am not familiar with those things either


HUH? ;^)



rmh -> RE: mvvs 1.60 gasser carb #'s (9/19/2006 12:40 AM)

ah---you corrected your typo---sly devil--



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