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07-07-2008 06:10 PM  9 years agoPost 1
ez2bgman

rrElite Veteran

N'awlins, LA

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I finally decided to "bite the bullet" and get the new 8mm head. As usual, Rusty's customer service was top notch and shipping was fast. I ordered it on Friday and had it in my hands by Monday.

While there are no instructions with the new head, building it is exactly the same as the 6mm head. The only difference are the dampeners. As most know, the new 8mm head uses 2 o-rings for dampening instead of the current style.

The o-rings are a little harder to put in. Here's what I did. After I had both o-rings properly seated in the head, I lubed them generously with some silicone grease (I use dielectric grease from Autozone - used on spark plugs). I then pushed the 8mm spindle through one side. Once the spindle was through one side, I put the other side against a block of wood and used it to hold the o-rings in while I pushed the spindle through.

After assembling the head, it did feel a little on the stiff side. This can be attributed to the new o-rings with stiffer dampening. To my surprise, the bolts for the flybar carrier are now 4mm. The seesaw itself is slightly thicker so the the 4mm bolts have more threads to "grab" onto. I chose to use some spare 4mm spindle black oxide bolts instead of the stainless bolts that are included. I just used my dremel and removed about 2 threads from the end of each bolt and that turned out to be the perfect length. I also used red loctite to secure the 4mm seesaw bolts to the seesaw.

The 8mm head is also a bit heavier. With the 6mm head, my X50 tipped the scales at 7lbs 10oz. With no changes other than the new 8mm head, my X50 now weighs 7lbs 13oz. Because of the added weight up top, I decided to order some 4mm Superstubz to use with the new head. The Superstubz are only 12g each compared to 23g for each of the 95mm V-paddles that I have been using.

As other have stated, the short links need to be shortened. I ended up using some slightly shorter threaded links I had in my box and then cut about 1-2 mm from the end of each plastic link. Then I reassembled the short links. With the mixing arm parallel to the grip arm, the short links ended up at about 24.65mm each (measured with my digital calipers). I then adjusted teh long links from the swash until the blades were at zero pitch at mid stick. No other adjustments were needed. I ended up with +/- 12.5 on the collective and +/- 8.5 cyclic (same setup as the 6mm head) without any binding.

At the field I switched out my 95mm V-paddles for some 4mm Superstubz. I also double-checked all the settings. Once everything was rechecked and the Superstubz aligned, I fueled her up.

I picked her up in normal mode (1750 rpm) and I notice a slight wobble. I checked all the surfaces and then flipped the switch into Idle Up 2 (2150 rpm). The wobble went away and she was hovering perfectly. Because I took my time zeroing out the blades on the bench, the tracking was dead on.

I flew a couple of circuits and she felt very good. She tracked straight as an arrow in FFF and turns were easy and predictable. I brought her back in front of me. I proceeded to do some pitch pumps. Damn is this new head responsive! I then brought her up a little and proceeded to do some stationary flips and rolls. Flips and rolls were not only perfect, but they were very quick. The Superstubz proved to be a perfect match for the new 8mm head.

This head is ultra responsive. It feels even more connected than the 6mm head. I was a little worried about the overall stiffness of the head when I first built it. But after the first flight everything started to loosen up nicely. The wobble that I experienced on the first flight, were gone by the time I finished the first tank of fuel.

Autos were very nice. I thought I would have a little wobble toward the end, but there was none. The first flight ended in an unintentional auto because I ran out of fuel. I was having so much fun flying and tossing my X50 around that I neglected to check the fuel level...LOL

I ended the 2nd flight with a nice high (about 200-300 ft) auto. The new head is very predictable during an auto. It is very easy to hear the headspeed decay as you near the end of your autos.

Overall I am Xtremely (pun intended) impressed with the new head. Although it is "beefier" and heavier than the 6mm head, I did not notice the extra weight in the air. She still felt very light. Response is amazing. The machining was absolutely perfect. There were no marks anywhere and everything lined up perfectly. I highly recommend the 8mm option to anyone thinking about it. There is nothing wrong with the 6mm head, but the 8mm head definitely feels more responsive.

Gary
Hot Girlz in da gallery

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07-07-2008 06:16 PM  9 years agoPost 2
inkspot1967

rrProfessor

Cranston Ri

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Gary holy crap does your hand hurt after writing all that.....lol

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07-07-2008 06:34 PM  9 years agoPost 3
A129

rrApprentice

Home

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Gary holy crap does your hand hurt after writing all that.....lol

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07-07-2008 07:00 PM  9 years agoPost 4
buzzsaw

rrElite Veteran

Southeast USA

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Guys,I flew all day with Gary yesturday and I can assure you that the 8mm head is a very nice upgrade,that head is solid.Gary and I were both hammering the death spials to death and the 8mm head never let up.Gary took it up in to ORBIT and tail slid it all the way down into a very hard/aggressive farward flip with all the collective it could take......THIS GOT EVERYBODY'S ATTENTION!.....and never missed a beat.I would have swore that it was Bobby Watts on the sticks on that one,Props out to ya Gary,that was awesome!I have to admit though,my 6mm head has well over 200 flights on it and a couple of crashes and is doing ok so far without any issues at all.RJX Rules when it comes to customer support and giving us the options of upgrades.I may upgrade mine once I am done with the new X90 Dominator after I get it.

Buzzsaw

SkySpy Aerial Video

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07-08-2008 03:49 AM  9 years agoPost 5
rsalazar

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Florida, USA

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thanks for the report and the update

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07-12-2008 05:47 PM  9 years agoPost 6
edball flies!

rrNovice

Singapore

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Hey Gary,

How much cyclic did you have dialled in for the new head?

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07-12-2008 09:24 PM  9 years agoPost 7
Foxden

rrElite Veteran

Port Charlotte, FL.​USA

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He mentioned 8.5 on the cyclic

Clyde Fox
Port Charlotte FL
Team Outrage

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07-12-2008 10:45 PM  9 years agoPost 8
ez2bgman

rrElite Veteran

N'awlins, LA

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edball,

I am running +/- 12.5 collective and +/- 8.5 cyclic. The new 8mm combined with 4mm Superstubz is very quick and responsive, yet FFF is very straight with no pitchiness.

Gary
Hot Girlz in da gallery

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07-12-2008 11:15 PM  9 years agoPost 9
rsalazar

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Florida, USA

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Gary, thanks for the update. It that the max in collective

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07-12-2008 11:29 PM  9 years agoPost 10
Foxden

rrElite Veteran

Port Charlotte, FL.​USA

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I've got the 8mm head on our X50 also, 8.5 on the cyclic is just about maxed out, I'm also right around 12.5 - 13 and could probably squeeze another degree, just don't think it needs it pulling the RT610's

Clyde Fox
Port Charlotte FL
Team Outrage

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07-13-2008 01:14 AM  9 years agoPost 11
rsalazar

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Florida, USA

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Clyde, thanks for the info

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07-14-2008 07:42 AM  9 years agoPost 12
edball flies!

rrNovice

Singapore

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Hey all,

This is so interesting, I am using the new head and guess what, my settings are the same as what Gary mentioned. I originally had it at about 6.5 on cyclic and +-12 on the collective on the old head, I find that was plentiful for me then. On the new head however, I used the same settings and found they were inadequate, rather than adjusting to a set measurement, I simply increased cyclics and collective to suit my flying making no binding occurs. I found the opportunity to check them again and they are now about 12.5+- and about 8.5 on the cyclic. I think I had them dialled to 13+- on the collective before but it is too much for the motor. I tend to bog it accidentally everynow and then with that setting. I think 12+- is a good starting point for the RT blades and CY stubz, if the engine is tuned right, the heli can recover from bogging/load quite easily just by easing/ stretching the moves a bit, you can pretty much tic toc real quick all day long, alot of fun!

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09-18-2008 07:20 PM  9 years agoPost 13
aashu

rrKey Veteran

scotch plains, NJ

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Hi

How much just the 8mm head upgrade cost ?

Garden State, NJ

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09-20-2008 09:36 PM  9 years agoPost 14
alfred

rrVeteran

Australia, New South​Wales, Mid North​Coast

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A couple of questions:

Why did you replace the stainless steel bolts at the flybar carrier?

Will they bring out a new set of suitable short ball links?

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