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HelicopterScale Model RC Helicopters › Vario MD 520 Notar question
02-20-2011 01:52 AM  6 years agoPost 1
tobsam

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UK

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Hi all,

I have recently bought a Vario MD 520 Notar. It has the Webra 75 engine in it and the video I have seen of it flying looks very good. The previous owner who built it has made a nice job of the build and the paintwork, lighting etc. Unfortunately there were no build instructions or any other information that would have come with the Notar which would have been very handy to have as well.

Now my question concers the tail rotation operation. All of the Vario MD 520 Notars that I have seen pictures or videos of seem to have rotating cones that block part of the air pressure needed to rotate the tail of the Notar. There is only one opening on the tail for the air to come out of. My Notar does not have a rotating cone on the tail boom at all but has two openings at the end of the tail boom, one opening on either side. These openings also look taller and narrower than the ones I have seen on other Vario Notar helis. There are two cables that run from a servo, that is in place at the front of the tail boom, and these run down inside the boom to what I can only assume must be some sort of air deflector plate that deflects the air from one side of the boom to the other at the other end of the tail boom that gives the Notar its tail operation.

Did Vario make two versions of the MD 520 Notar, either one or two tail boom openings?

I would be very grateful if perhaps someone on the forum can shed some light on this for me and also let me know where I could possibly get a set of build instructions and diagrams for this helicopter. Also if anyone has a set that they could possibly make copies of and e-mail them to me etc then I am quite happy to pay for this.

Thanks

Steve

If you build it scale then fly it scale.

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02-20-2011 02:29 AM  6 years agoPost 2
Christopher J

rrElite Veteran

Kansas City, MO​Californian lost in​land of Oz

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For the build plans go to http://www.vario-helicopter.de Go to fuselages, click on your fuse. When,the page opens look in the top right and there will be a pdf download of the plans. The tail on yours and what you described is much different then my MD 900.

Christopher J
same as I ever was
"Still all set & Flying the original"

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02-20-2011 03:20 AM  6 years agoPost 3
Phoenix NOTAR

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State College, PA​USA

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Steve,

Yes.

You are the proud owner of one of the "original" Vario NOTAR's circa 2000-2002. It did work (I flew mine like that quite a bit), but it was a very inefficient system, and was not at all "scale like". Vario made a upgrade kit in 2002(ish) to the current rotating cone style that works much better, and is more "scale" to the actual MD520 and MD900 (902), MD600 etc.

With the "door" parallel to the long axis of the tail boom, (hover position, no yaw command) the fan pushed air out of both the left and right side, but since the left side is larger, more air came out that side and "balanced" the rotor torque. To yaw left the door closed off the right (smaller opening) and the heli rotated to the left. To yaw right, the door closed off the left opening and the heli rotated right (natural rotation).

The problem was, with both sides open, the fan was working really hard moving a lot of air, and consuming a lot of engine power just to hover. The new rotating cone style has the opening only on the left, and the rotating cone closes off this opening to control yaw rate. The more that it is closed off, the more the fan "stalls" and does not work as hard, and does not consume as much power, helping everything.

I will look to see if I still have a paper version of the original instructions that I could scan ans send to you. I do not know if I do or not.

It would be best to "upgrade" to he newer style, it is a much better system.

Sandy

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02-20-2011 03:39 AM  6 years agoPost 4
seattle_helo

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Seattle, WA USA

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Fascinating!

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02-20-2011 06:05 AM  6 years agoPost 5
bcopters500

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Texas

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520n

My machine was very powerful with a tail that was very powerful OLD STYLE design. The catch was it had the coke bottle guide vanes installed on the left side of the thruster cone internally you get it?
People assume the tail was weak cause the rate was slow YAW and it wasnt true. If you turned off the heading hold, you would see the most snappiest stuff you would freak out for sure. The Webra p75 was my engine of choice and worked very well. Very simple, I sold mine but would love to own another, hands down.

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02-20-2011 11:38 AM  6 years agoPost 6
tobsam

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UK

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Thanks guys,

All of that info has been really helpful. So mine is the early version then which in a way I am pleased about as I do like having original helicopters. I must say that for a helicopter that is about 10 years old it is in fantastic shape still.

Phoenix Notar that would be great if you could manage to find some of the paper instructions to copy for me and would be very much appreciated.

I have added a few more pics of the Notar and a video link of it flying so you can see that the tail responds very well in flight. It has a Futaba 501 gyro fitted at the moment and some decent JR servos as well. The 501 does seem to work very well in this helicopter.

The two pilots that are in the heli at the moment are coming out as they are not very realistic at all and I will be on the lookout for a couple of scale looking pilots that will look better sat in it.

The colour is supposed to be "Bulls blood red" but I have never heard of this colour so I think I will be popping along to my local car body spray shop to try and get a colour match paint made up and put in a spray can. I want to colour those white door hinges in the body colour and get the front nose cone window panel lines sprayed in as well.

Let me know your thoughts on the video and the yaw rate of it in flight.

video http://www.youtube.com/watch?v=7wVtdt7CScQ

Thanks
Steve

If you build it scale then fly it scale.

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02-20-2011 02:33 PM  6 years agoPost 7
Phoenix NOTAR

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State College, PA​USA

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Steve,

Attached are 3 pages from the original manual (hopefully Vario will not mind) that pertain to this thread. Please PM me if you need the remaining pages.

I think that the video of yours shows marginal tail control. Flyable, but it may be difficult in windy conditions. It gets much worse with that style tail if you try to use a 5 blade head (more anti-torque needed).

I also agree that the special Vario Webra 75 (large cylinder head) was a very nice nitro engine for this helicopter. Too bad Vario stopped making the special head, and now Webra is gone as well.

Here are some links to my MD520 flying with the Webra 75, five blade head and the new style tail cone:

http://www.youtube.com/watch?v=haZ2...player_embedded

https://rc.runryder.com/helicopter/t566370p9/ Page #9 down about ¾ of the way you will see 4 you tube videos with my name in the title, one is of the MD520 NOTAR.

Sandy

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02-20-2011 04:07 PM  6 years agoPost 8
tobsam

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UK

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Thanks for the copy of the pages Sandy. They are really useful. I can now see the difference and it gives me an idea of how it all works now.

Your Notar looks really good in the video. I only fly scale so that type of flying suits me just fine. Did you make your own scale exhaust or was it an accessory that you can buy?

Steve

If you build it scale then fly it scale.

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02-20-2011 07:38 PM  6 years agoPost 9
Notar

rrKey Veteran

Taxachussetts

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Those were the days. We even blocked off the duct on the right hand side of the heli, and it made no difference in flight. We were hoping for more left hand authority. The new version is the only way to go on this.
Joe

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02-20-2011 08:46 PM  6 years agoPost 10
Phoenix NOTAR

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State College, PA​USA

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Steve,

I am not sure what you mean regarding the exhaust on my MD520. The muffler and header pipe are stock Vario, the 90 degree part is also Vario (#907/9 I think), although I dressed it up a bit with a few small items. It has a piece of black rubber sheet blocking most of the large opening, so that only the rubber diverter fits through tightly.

I found that Byrons "Rotor Rage" 30% fuel works great with this Webra P5 75 motor, and lets it make a lot of power without too much smoke (I started using it in October 2009).

Sandy

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02-20-2011 09:18 PM  6 years agoPost 11
tobsam

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UK

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Sorry Sandy, I meant the scale appearance of the dummy exhaust exiting the fuselage. My Notar only has a small opening at the rear just big enough for the exhaust to exit through and I wanted to try and get myself a dummy exhaust and have the engine exhaust exit through here.

A bit more on my Notar that I have only found out this afternoon. It was ordered from Vario here in the UK in 2002 but only built just under 3 years ago. The previous owner who built it has had less than half a dozen flights with it and I can believe that looking at how clean everything is. He made the video to show it flying in case he never flew it again. He only added the video to you tube when I asked to see it flying. Even the Webra 75 looks as new. He was more of a scale byilder than a heli flyer so very rarely ever used it. Apart from a bit of oil that was put in the engine cylinder and turned over every now and then to keep everything nicely lubricated and free, it has sat on a shelf in his study in its own custom made dust cover.

I am very happy with the Notar and want to get it in the air to see just how this tail performs having heard from several people on here that it has very little yaw with the system that it has fitted. Should be interesting.

Joe.... I have sent you a PM thanks.

Steve

If you build it scale then fly it scale.

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