How's that DX7 working out for you?

Ya, that tail motor is a b***h, but it's managable.

They put a Gyro on that axe and they wont have to fly the tail anymore ..

Excellent! Great link. I had searched that site before and found nothing. I must have done it wrong.

Just ordered some gears, Thanks!

Maybe you guys have been here, but I use this sight for calculations.

http://www.readyheli.com/Online_Head...lator_s/81.htm

Thanks a million TEX for starting this thread. The links are really helpful. All this information about gear ratios etc. I'm just wondering what is a good headspeed for this Heli?

Hey, no problem, we need dicussions like this to work our way through the unknown.

2500-3000rpm, I found that anything more and it's hard to get the blades tracked. I'm sure the CNC parts can take higher rpms, I just play it safe.

Somebody here uses a tachometer, I am going to order one as well.

Yup, mentioned last night, mine turns 3k exactly at full speed/no load, and it's right nice. Much more than that would make me nervous.

Great info site on flight training.

http://www.dream-models.com/eco/flying-index.html

I have calculated out the rotor blade TIP speed in mph. 2500 RPM on the head with 315mm blades is 184 mph. 3000 RPM on the head with 315mm blades is 221 mph. Don't get your fingers involved. Thanks for the info guys, Ace9.

[:@]That would be painfull.

Here's another calc page: http://dhrc.rchomepage.com/calcAdvanced.htm

Got a question for ya guys .. on my 450 there is play in the head.. Left to Right about 1/16 to 1/8th but there is no up and down play.. hopefully someone else has the same thing ....

Tighten the screw at the bottom of the head. Hold the nut with a nut driver or pliers and use a #1 phillips to tighten it.

Runout at the rotor button on mine is almost imperceptible, maybe 1/32 at most. It's hard for me to tell just by wiggling, and I don't have a dial gauge to check it.

There are really only a couple of things that can move in the shaft system: the shaft in the main bearings and the hub on the shaft, but the heli itself flexes, too. are you sure the play you're seeing is all in the shaft system? If it actually does move 1/8" I'd be trying to find out why.

[Edit] Tex is on the money with checking the hub screw, btw. Mine was loose when I got it, come to think.

Throttle and pitch curve set up at the bottom of this page.

http://www.trextuning.com/setup2.php

Went out to the field today, flew great!!!

Hey TEX,

The DX7 works great! Tough to find though....dug around the net to find one and turns out they just had the TX/RX no servos from a place in the UK. I like my Futaba 9C Super just alittle more....the two linked RX's are kind of annoying...and you have to us a binding cable to lock the TX/RX together. Futaba's 6Ch FASST system seems to not need that provision. I wish they would come out with a higher channel count in the FASST lineup The build quality on the 9C is better obviously...but not having to do the freq. dance is nice The DX7 response is very fast and the controls are precise,....it almost make the heli alittle twitchy...if you can believe that...lol...I just have to get used to it. Great thread by the way...I was waiting for someone to start the ball rollin'! I also just bought the Micro-Heli CNC tail assy. It has a upgraded pitch slider with dual BB, and CNC Bell crank. Makes it a true full ballbearing tail. At $99.00 it wasn't bad...not sure about listing the site...don't remember if it's allowed or not. It looks very sharp. I won't replace it until my stock tail goes south....no point of throwin' money away
Thanks,
Chris

Welcome aboard rabidbandit!!

I fortunately haven't seen any issues with the tail pitch slider. It's very quick and responsive. Post some pics of that new tail when you put it in.

I am having a bit of an issue, I can't seem to track the blades. Every effort to find the problem has failed. I checked all the links and they are solid and not cracked. I measured the swashplate links to make sure they were as the manual describes. I balanced out the blades, I checked the head....nothing.

THe blade CP I had tracked perfectly. Now I have this $250 heli that won't track worth a damn. The closest I can get it is maybe 1/4 to 3/8 inches, but that's it. Even when I get it that close, buy the end of the flight pack it's way off.

Anyone having this problems or did I get the lemon?

Now I just fly it with the blades not tracked. I mean, nothing I do will make them track anyway so I might as well suck it up a fly the stupid thing. Man I am frustrated right now. GRRR[:@]

Looks nice, Tex. Are those Align blades glass or carbon? More to the point, how do they work for you? I tried the Align yellow blades, but they were too flexy for me, and I haven't flown the new MAH enough to really like or dislike them beyond knowing they beat the stockers in a walk.

I think we cross posted and maybe you answered my question .

I adjusted the MAH to track within about .2 mm up and down. YMMV.

They are 325 Pro Wood blades....balanced out of the package. Although that doesn't matter since my heli is not being nice.[&o]

I ordered two sets of CF blades like the ones shown here this morning. MAH called me to confirm and they will be here tomorrow. They have great customer sevice so far! They are distributed by MRC and RCHover.

Background


MAH is a Russian company specializing in composite radio controlled helicopter products. The company was founded by designers with ties to the Russian aerospace industry. They were involved with various composite technology development programs, one of them being related to high efficiency aircraft propulsion systems. Their professional experience and knowledge eventually merged with their interest in the radio control hobby. This brought about the beginning of what has now become a recognized name in the RC Helicopter community. As we all know, this hobby has benefited greatly by advances in technology. As the helicopters themselves became more capable, the level of flying also dramatically increased, especially in the 3D arena. More demands were placed on rotor systems, and MAH has continually been on the leading edge of innovation throughout.


DBK International is the United States based importer of the MAH product line, located in the New York metropolitan area. The president of DBK International, Dmitry Kupershmidt, is an avid radio control enthusiast with over five years of helicopter experience. Dmitry worked very closely with MAH to develop the Generation II product line. DBK International is proud to be the exclusive United States based source for consumers, distributors, and vendors, for this exciting new innovation in rotor blade design.


Product Line


MAH manufactures high quality composite rotor blades and flybar paddles for radio control helicopters. The MAH product line contains blades fitting the most commonly available helicopters – from micros through 90 size machines. MAH is also developing special application rotor blade systems for heavy lift machines, such as camera ships. In addition to main rotor blades, MAH also manufactures a complete line of high performance tail rotor blades. All MAH rotor blades are matched by center of gravity and overall weight. Refer to the following tables to see our current offerings.


Main Rotor Blade Design


MAH blades have always been well known for their appealing aesthetics. The trademark carbon fiber weave bordered by white gel-coat contributes to both form and function. Showcasing the black carbon fiber weave is an important finishing design goal. When static, the blade is quite attractive, yet when in motion the white gel-coat borders create a highly visible blade disc. This is very important from both an orientation and a safety standpoint.


MAH blades are designed with an emphasis on 3D flight performance. In order to achieve crisp and responsive flight characteristics the blades must resist span-wise flexing and twisting. Each blade is created with 6 layers of hand made carbon fiber laminate to satisfy this requirement. The interior structure of MAH main rotor blades consists of six primary components.


1. Bass wood root / bolt reinforcing insert in blade root

2. Fixed brass bushing inside bass wood to accept blade bolts

3. Balsa main spar

4. Balsa trailing edge spar

5. Lead weight, impregnated into carbon fiber laminate

6. Steel wire, attached to blade bolt structure and lead weight


MAH blades incorporate a revolutionary steel safety wire retention system. This assures a high level of safety in the event of a “structurally compromising impact,” better know as a crash. The wire substantially lowers the energy of a separated blade tip / lead weight assembly by tying the two structures together.


In addition to the above design features, MAH blades also feature “Dual Taper” technology. The blades are tapered along their chord as well as their airfoil cross sections, from root to tip. This design provides increased efficiency along the rotor blade span – optimized for 3D flight.

*Photos courtesy of Osterizer

Do you have a web address for these MAH blades .. i just balanced my STOCK blades .. could not believe how much tape i had to add to them to get them Balanced. have not even put them on Heli yet ..

Anything more than a strip of electrical tape top and bottom on one blade is too much.

http://www.mahblades.com/shop/produc...products_id=46
http://www.modelrectifier.com/search...ew.asp?ID=3409
http://www.rchover.com/mah?b=1

Limited quantities, get them now if you can.