RE: RE: RE: RE: mvvs 1.60 gasser (Full Version)

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Rudeboy -> RE: RE: RE: RE: mvvs 1.60 gasser (3/6/2004 5:49:33 AM)

Dual...

Now is the moment to order something in from the USA! The dollar is so low right now that it will probably offset the shipping costs... versus buying that same plane from a European supplier. Remember that that European supplier also has to pay shipping costs, and he has to make a profit too...



DualdudE -> RE: RE: RE: RE: mvvs 1.60 gasser (3/6/2004 10:48:57 PM)

Well, take towerhobbies for instance... they won't ship the 1.20 to europe.. so thats also a 'little' problem ;) Didn't find a shop yet that does :) But the prices are very interesting. Take the fourstar .40 for instance.. at towerhobbies it's about 50 euro's.. at the local store they charge 113 euro's for the same kit. Thats more than double!!!



Scoubidou -> RE: RE: RE: RE: mvvs 1.60 gasser (3/7/2004 1:41:22 AM)

Hello
I am going to order some Menz props for the red head. Do you know which Menz props are better for IMAC flying, Standard or Ultra?

I plan to order 17x8, 17x10, 18x8 because I did not get good thrust results with wooden 18x8 Master Aircrew.

Daniel
http://www.desertaircraft.com/menz.html



R/C Foolish -> RE: RE: RE: RE: mvvs 1.60 gasser (3/7/2004 7:32:03 AM)

To all,

What size is the shaft thread on the MVVS 1.6? I need to know to get the right adapter for a Tru-Turn spinner.

Thank you

John



Hans Meij -> RE: RE: RE: RE: mvvs 1.60 gasser (3/7/2004 7:55:41 AM)

M10 x 1



JimRoss -> RE: RE: RE: RE: mvvs 1.60 gasser (3/7/2004 3:37:34 PM)

I have an MVVS 160(Not Redhead) on my 120 Stinger and its' performance really sucks. Running a pitts style muffler and a 16 X 8 APC prop. Didn't tach it so I don't know what rpm it's running but it won't pull vertical worth a flip and seems to be slow in level flight. Would running a 17" or 18" prop improve the performance? What rpm could I expect from it with larger prop? With the 16" prop I never seem to develop high rpms.

Thanks,

JimRoss



PlaneKrazee -> RE: RE: RE: RE: mvvs 1.60 gasser (3/9/2004 8:59:16 PM)

Jim,

Try an APC 17X6 or 17X8 you will see better vertical with the lower pitch prop because it will spin faster but will require more throttle to fly at a given speed.

I would like to hear what someone is getting for rpms with one of these newer engines as they come from the factory with a standard Bisson muffler and one of the props listed above with about 1/2 gallon run thru it.



PlaneKrazee -> RE: RE: RE: RE: mvvs 1.60 gasser (3/9/2004 9:01:53 PM)

Scou,

Why not try an APC 17X8? They cost about 16.00 US.



Scoubidou -> RE: RE: RE: RE: mvvs 1.60 gasser (3/9/2004 9:14:36 PM)

quote:

Why not try an APC 17X8? They cost about 16.00 US.


I have heard that Menz prop gives more thrust than APC and they are less noisy and i am going to save a few onces in the nose of my plane.

I ordered 17x8, 17x10 18x8 standard prop but i think i will try a Menz 18x8 'Ultra'

The Ultra has less pitch to let the engine running at higher RPM than Standard Menz.



Scoubidou -> RE: RE: RE: RE: mvvs 1.60 gasser (3/9/2004 10:39:41 PM)

Skypilot, read that thread for more info on Menz vs APC propellers

http://www.rcuniverse.com/forum/m_202342/mpage_1/key_menz%252Cultra/anchor/tm.htm#202342



GBR2 -> RE: RE: RE: RE: mvvs 1.60 gasser (3/11/2004 6:00:27 AM)

I never did get a satisfactory answer to my question. The screws that mount the sensor come with 2 flat washers for each screw. Should both of them go under the head of each screw or one under the head and one between the sensor and the engine??

It is such a nice flat machined surface that it almost begs for the sensor to sit flat against it with the two washers under the screw head but that begs the question, why two washers per screw?

Thanks



Rudeboy -> RE: RE: RE: RE: mvvs 1.60 gasser (3/13/2004 3:32:31 PM)

I use the washers to set the sensor to drive washer distance... I imaging other people do the same...

On my engine the sensor slightly touches the drive washer without anything under the mount... so I enlarge the gap by placing a washer under the sensor at each screw hole.
When the engine goes into the plane I might make up a spacer of the proper thinkness to have a larger contact surface.

If your sensor does not touch, then by all means, don't put washers under it.



fiery -> RE: RE: RE: RE: mvvs 1.60 gasser (3/14/2004 1:43:09 AM)

GBR2

Just Engines (who distribute MVVS engines in the UK) in their instructions for this engine specifically state that one washer is to go under the sensor, and one above it, each side.

This gives the correct gap between sensor and magnet ( .5 mm max.). Also, it stops the supplied hold down screws from potentially stripping their threads due to bottoming out.

Spark plug gap is .5 mm (20 thou).

Hope this helps.

-------------------------------------------------------------------------------------------------------------------------------------------------------

R/C Foolish (John)

I am running a 3.25 " tru turn spinner on my 1.60. I used a Tru-Turn adaptor nut and washer. Tru-Turn do supply them in M10x1 thread. I used the online search facility at their website to verify the part no., and to order the adaptor. Service was very prompt.

The adaptor works perfectly, like quality engineered hardware should. I screwed the adaptor down after tightening the supplied washer and nut to "double lock" the prop, like usual four-stroke practice. The only thing I had to do was to trim down the spinner securing screw - the length it came was a little long, but that's no worry - better to supply long than short, to cover all types of prop hub thicknesses.

In case you don't already know:

The MVVS supplied combined prop nut & washer needs a 19 mm spanner (U.S. read "wrench" ), ground down parallel at its large flat sides to make it "thin" at it's head, like an OS spanner. I bought a 19 mm cheap auto parts store spanner for a couple of dollars, and ground it down with a grinding wheel to suit. The depth of the MVVS prop nut only appears to be a couple of mm deep where you apply the spanner. It can be difficult to take the prop. off when secured with the adaptor nut, without using the modified spanner. Now the spanner is ground down, it spanner slips in behind the adaptor washer, and on to the nut easily.

This was impossible to do with a standard thickness spanner.

The Tru-Turn adaptor nut, which is plenty deep, needs a 9/16 " spanner tighten - they haven't suffered the dreaded "metricus converticus" yet!

Cheers

fiery



fiery -> RE: mvvs 1.60 gasser (4/4/2004 3:21:59 AM)

Question: Is it OK to use a non-resistor plug in your 1.60 "Redhead" with dual pickup (Vlach) ignition?
-----------------------------------------------------------------------------------------


I looked at the plug supplied with my "Redhead" engine, and it is a "Brisk UR 17" resistor plug.

I bought an NGK BM6F as a spare/replacement, and removed the top post to suit. I am now wondering if this plug should in fact not be used, as it is not a resistor plug. I haven't tried it yet.

Pe, or any MVVS ignition system experts, is it OK to use this non-resistor plug? I have heard on another thread that the Vlach ignition will not read the plug correctly unless it is a resistor plug. Also, even though the sytem is fully shielded, I am concerned to minimise possible RFI.

Please let me know!

fiery



Scoubidou -> RE: mvvs 1.60 gasser (4/10/2004 8:50:00 PM)

I played with a some Menz 'S' prop today with the red head.
Bisson Pitt muffler, 33:1 oil ratio.

17x8: 7800 RPM [:D], 14.8lbs from thrust H.P
17x10:6800RPM[:o], 11.6lbs from thrus HP
18x8:6900RPM, 14.5lbs from thrustHP

I am going tu use the 17x8 for the maiden flight next week. the 17x8 is the most noisy prop and the 18x8 is really quiet but i can not get enough RPM without tuned pipe.

Daniel



R/C Foolish -> RE: mvvs 1.60 gasser (4/10/2004 10:51:05 PM)

Started my motor today in Katana 140. Runs really well. I had to go full negative expo. on my throttle though to get a fairly smooth curve. Otherwise I was at full throttle at 1/2 stick. Any suggestions on how to correct this?

John



rsrogers -> RE: mvvs 1.60 gasser (4/11/2004 3:23:04 AM)

Hey John I flew my Kat 140 today for the first time with the MVVS 1.6 gaser on it & it flew real nice. I was using a Pro Zinger 18/8 & it was just a little to much wood. I'm going back to an APC 17/8 on the next flights. Other than slightly sluggish with the wood on there the plane is a great flyer & mine is seriously tail heavy. I had an 18/8 APC on the engine at one time & it pulled great but the 17/8 is my #1 choice
Scoub I know you would be interested in that info. I could'nt remember which thread we were talking about it in so I'll catch you in this one.
John, to give you my answer to your question, what I do to fix that problem is I set my throttle stick & servo at center & the butterfly on the carb at center and this is where I hook up my linkage. By doing this you will have more than enough in both directions & I can just set end-point adj. for idle & full throttle. I use a standerd round servo horn & a ball link & this keeps the EPA to a min. Still at best you will probably reach full throttle at around 8/10ths of the stick. Dont know why but all my gassers are that way!! Maybe someone else can jump in here & help us out.



PlaneKrazee -> RE: mvvs 1.60 gasser (4/11/2004 1:30:38 PM)

[8|]



Scoubidou -> RE: mvvs 1.60 gasser (4/11/2004 7:48:07 PM)

I had the same throttle issue with mine. I programmed my radio to get only 50% of servo's travel course. With that set-up, i can use the throttle stick 0 to 100% to set the speed.

After many tests on different props, the Menz 17x8 or APC 17x8 and the APC 17x10N are the best choices for the MVVS1.6 gasser with an incowl muffler. The engine runs around 7700 to 8000RPM for maximum H.P.
18x8 prop without tune pipe is to much.

That engine is a great combo in any 10 to 12 lbs aerobatic plane ! Maybe i will give a try in a Katana soon but i am going to fly some IMAC contests with my Extra300L this summer.
Daniel



pe reivers -> RE: mvvs 1.60 gasser (4/11/2004 11:03:30 PM)

The butterly plate valve in the Walbro carb is much thinner than the shaft it is bolted to. The valve can rotate trough quite a large angle, before it's flow path blocking increases over the normal shaft wake, so in effect, before any flow reducing effect sets in. This is typical for all butterfly valves, and is a well known phenomena in fluid mechanics. Things improve when you set 80% open as full throttle, when throttle response will become "more" linear.
Some more expensive Walbro types have a slide valve throttle, which at least in theory promises a more linear throttle response



R/C Foolish -> RE: mvvs 1.60 gasser (4/12/2004 12:09:29 AM)

RSROGERS,

Thanks for the tip. I was flying my Katana this morning and came in a little short of the runway, tore out the landing gear and loosened up the tail. All fixed though and ready to go. I set up the throttle like you said and it looks a lot smoother.

Thanks

John



rsrogers -> RE: mvvs 1.60 gasser (4/12/2004 1:11:38 AM)

Your welcome John.
Thanks also "p." I have often thought of what you explaned because I have noticed on all my carbs that the last 20% of butterfly movement on top end results in little to no rpm change - thus the 8/10th's full throttle I mentioned earlier - opening or closing.



ole.steen -> RE: mvvs 1.60 gasser (4/20/2004 10:41:28 PM)

Folks!

Here are some pics of my funtana and engine installation. Notice home-made engine mount with Du-Bro rubber dampers, and Krumscheid 22mm stainless header connected to original MVVS pipe (not shown). I now turn the Mejzlik 18x8 prop 8100 rpm after 5 liters of gas run-in.

Ole



David_Moen -> RE: mvvs 1.60 gasser (4/20/2004 11:39:31 PM)

Very nice!

Did you have to build the tunnel for the pipe?



Rudeboy -> RE: mvvs 1.60 gasser (4/21/2004 1:24:07 AM)

Very nice indeed... Could you send me one of those mounts? :D
If I can get my 1.60 to turn those figures when I receive my pipe I will be a happy man. The muffler is ok up to 7500 rpm... after that it gets too restrictive... the pipe should fix that.

Also, how does that long header hold up with the soft mount? Have you run this setup for 5 liters?



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