HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Oct 11, 2012, 05:49 PM
JFS
Registered User
United States, TX, Mission
Joined Jun 2007
24 Posts
Discussion
Vario MD900 Explorer Notar

air?
JFS is offline Find More Posts by JFS
Last edited by JFS; Oct 22, 2012 at 09:29 PM.
Reply With Quote
Sign up now
to remove ads between posts
Old Oct 11, 2012, 07:56 PM
eff
Registered User
eff's Avatar
Joined Nov 2010
34 Posts
great heli, so for a start, let share more pics please.. and some tech info.. this is something different to see
eff is offline Find More Posts by eff
Reply With Quote
Old Oct 11, 2012, 08:13 PM
Registered User
Double E's Avatar
Atlanta, GA
Joined Mar 2009
887 Posts
Vario is top of the line when it comes to scale helicopters. You probably won't find any Vario parts at your local hobby shop but there are some dealers in the US and Canada.

Here is one.
http://www.eastcoastvario.com/
Double E is offline Find More Posts by Double E
Reply With Quote
Old Oct 11, 2012, 08:33 PM
Complete RC Idiot Savant
The Netherlands
Joined Nov 2009
2,485 Posts
The MD 900 is a current helicopter, still in the range of Vario, and probably they are going to cotinue this model for some time more, it is one of their eyecatchers.

Usually Vario has pretty good service, just contact their importer, chances are, they have virtually everything in stock, and will ship promptly (at least, that is one of Vario's key marketing points, quick spare delivery)

Vario helicopters are usually of very good quality, but since these kits (and the Notar in particular) need considerable building skill, flight quality is completely depending on build quality. Especially the construction of the tail rotary valve is pretty critical. If it is an early model, chances are it has a cable operated flapvalve, that unfortunately was discontinued quickly, so please check this.

If the radio equipment is in good condition, don't change it; it does not give any benefits as long as the servo's (especially the tail) is within Vario's specs. Swashplate should be OK with 4 x S9202, or 3 x S9206
Tail needs a strong digital servo, fast is less important
As long as the gyro is not a mechanical one, no need to update. Scale helicopters do not really need high-end gyro's and these helicopters typically tend to not really like those high end stuff either (it is possible though). A Futaba G 400 or GY401 should be all you need.

The motor should be good, Webra's were excellent engines.
They don't like high Nitro content, and usually this motor should be fine with either 0% Nitro, 15% fully synthetic, or if you prefer, 5% itro and 18% full synthetic.
Don't use more Nitro, unless compression ratio has been adjusted accordingly.

This particular helicopter has a gear ratio of 11.2:1, and you definitely need as a minimum 1350 RPM on the head, in order to get sufficient engine RPM to keep the fan in its effective range.
Due to the (slightly unusual) gearing ratio lots of people make the mistake of adjusting "by sound" and ending up with too low RPM, not enough tail authority, and I would not be surprised if that is the reason you got it that cheap.

Just let it rev high (adjust the pipe accordingly) and enjoy.
Take care, this helicopter requires a lot of power, so fuel consumption is probably high, typically allowing for max 10~12 minutes of flight on the 500 cc tank.

Due to the partly downwards directed airflow out of the tail, the tail tends to lift. these helicopters should be balanced 1/2 to 1 inch tailheavy!

Have fun with it!

Brgds, Bert
Brutus1967 is online now Find More Posts by Brutus1967
Last edited by Brutus1967; Oct 11, 2012 at 08:51 PM.
Reply With Quote
Old Oct 12, 2012, 12:03 AM
Registered User
Sweden, Gothenburg
Joined Aug 2005
811 Posts
Quote:
Originally Posted by JFS View Post
So I came across this Vario heli and got it dirt cheap, I fly raptors and trex 500 so this is my fist big heli. actually is really big! I would like to ask the Vario users their opinion; are Vario spare parts easy to get here in the us? is this model really old? I don't find a lot of info about it on the internet. en engine is a Webra 75 P-5, old futaba servos and an old futaba gyro. I am considering updating the electronics and fly it. what do you think? is it really worth it to get it bak in the air?
A friend of mine have two of them,there are one with older mechanics and one with newer,the newer one has improved tailmechanism.

Cheers
Jack
viggen65 is offline Find More Posts by viggen65
Reply With Quote
Old Oct 12, 2012, 12:10 AM
JFS
Registered User
United States, TX, Mission
Joined Jun 2007
24 Posts
Wow Brutus that was quite a report on the MD 900, I already started taking her apart for cleaning and repairing, hopefully I'll be fliying her in about a month. the notar is the servo version,S9250 servo on the tail. I'm attaching pictures of the tail and boom duct.
JFS is offline Find More Posts by JFS
Last edited by JFS; Oct 22, 2012 at 09:30 PM.
Reply With Quote
Old Oct 12, 2012, 02:38 AM
Complete RC Idiot Savant
The Netherlands
Joined Nov 2009
2,485 Posts
Me and my hobby-buddy are building together (regardless whether it is mine or his helicopter ont he buidling board) and currently it is his MD900 under construction....

I see you have the two bladed version... than 3 x S9202 is OK
For a mutliblade these servo's are on te lower limit but for a paddlehead it is OK.
The S9202 and S9206 are in my opinion the best swash servo's ever....

As far as I know the 9250 is OK on the tail. Just check if that tail cap is rotoating smoothly..

Please be really careful with "re-doing things", these heli's really dislike excessive weight (they are pretty heavy as is), don't go over 6.5 kilo, because every ounce loads up the tail system, and even if that system is sufficient, it does not have the power reseves of a conventional tail rotor...
Vario's are usually designed to be functional on the inside, and I have seen several Vario's being built too neat, too tidy, reinforced where no reinforcement was needed, modified where no modification was necessary, and ending up to be too heavy to fly good.
Usually, a Vario built according to plan, flies (within the limits of its design) impeccable.

The GY 240 should be able to do the job as well, personally I would not change that for something different.
Lots of "tail problems" that I see reported here, can be solved by going back to a low-tech gyro and some practice in manual tail control, rather than high end gyro and superfast servo and endless adjustment. Especially with non-conventional tail systems like NOTAR and Fenestron, this seems to be the case.

Good luck getting it back into the air.

Brgds, Bert

PS: what did you consider "dirt cheap"? New price of this helicopter will be somewhere in the area of 2000~2500 Euro, depending on installed components and rotorhead

EDIT: forgot to mention: I saw, you are flying T-rexes and Raptors: These big helicopters, although completely up to the job, don't like rough landings, so while in the process of rebuilding and repairing, practise your landing skills with respect of soft touch downs.
Set your pitch curve to -2 degrees minimum, +5 degrees midstick and 9~10 degrees maximum, and make sure your throttle curve keeps a constant RPM while airborne or you will REALLY get into trouble....
You CANNOT fly these big machines with the curves usually flown in Raptors and T-rexes. The fuselage and landing gear are not designed for it (if they were, the thing would become too heavy to fly, so please think twice about reinforcing those areas).
Brutus1967 is online now Find More Posts by Brutus1967
Last edited by Brutus1967; Oct 12, 2012 at 06:17 AM.
Reply With Quote
Old Feb 15, 2013, 08:12 AM
Registered User
Joined Feb 2013
1 Posts
vario

want to see complete of it bcoz i too work for same md real heli ive same heli too ....
sasatata is offline Find More Posts by sasatata
Reply With Quote
Old Feb 16, 2013, 08:55 AM
Chris Reibert #78
crmodels's Avatar
Joined Dec 2008
422 Posts
Varios are gorgeous!!
Sandy Jaffe has some beautiful Notars.
Always a treat to see why he brings to our fun ly each year.

Here is his Notar and a few other beauties!



crmodels is offline Find More Posts by crmodels
Last edited by crmodels; Feb 16, 2013 at 06:15 PM.
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Small ducted fan for NOTAR micro heli MassiveOverkill Micro EDF Jets and Power Systems 14 Jun 11, 2012 06:19 PM
Discussion Think Tank! Vario NOTAR how would you Electric convert it? Ghia Electric Heli Talk 50 Oct 09, 2011 11:08 PM
For Sale Super Low Price on New Vario Notar Kit! HeliMech Aircraft - Fuel - Helis (FS/W) 0 Sep 11, 2009 01:12 AM
For Sale Vario Notar Kit For Sale! HeliMech Aircraft - Fuel - Helis (FS/W) 2 Sep 11, 2009 12:57 AM