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RE: MX450 XS Discussion Thread - 3/25/2007 4:12:11 PM   
[]TEX[]



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From: Glencoe, IL, USA
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quote:

ORIGINAL: rabidbandit

I'm definately in love with my 450XS...decided to go with the Spektrum DX7 with Futaba 3107's and a 401 for the gyro. Also used the recommended brushless and LiPo's. Spent some time checking link lengths and blade balance. The links I measured with a digital caliper and got them almost perfect...the blades were pretty close...not enought vibe to notice. The blades track true and used a tach to set the head speed. My ESC is a Castle Creations 35 and set the gov. with the phoenix link. I'm very pleased with the kit. The only thing I'm not thrilled with is the tail pitch slider. The bushing seems to bind alittle at first....cycling it a bunch of times and it seemed to do the trick. If it gives me problems...I can always swap to the T-Rex tail. Looks sharp...I suck at air brushing...so I guess it'll be white for awhile until I find someone with some skills I to have the Axe CP...def need a head hold...constantly correcting/trimming the tail gets old. Hell...I'm still runnin' NIMH's...flight time is short but it does the trick in the living room. Well, just my two cents....thanks, Chris


How's that DX7 working out for you?

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RE: MX450 XS Discussion Thread - 3/25/2007 4:15:24 PM   
[]TEX[]



Posts: 9355
Joined: 6/27/2006
From: Glencoe, IL, USA
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quote:

ORIGINAL: osterizer

Yes, the Blade. I wrecked mine TWICE today when the tail kicked out-- $%^& motor was whacked but I didn't figure it out until the second time. Sure was fun 'til then.


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

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RE: MX450 XS Discussion Thread - 3/25/2007 4:16:22 PM   
sammy64


 

Posts: 174
Joined: 1/27/2007
From: Garland, TX, USA
Status: offline 		They put a Gyro on that axe and they wont have to fly the tail anymore ..

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RE: MX450 XS Discussion Thread - 3/25/2007 4:19:40 PM   
[]TEX[]



Posts: 9355
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From: Glencoe, IL, USA
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quote:

ORIGINAL: rollingball

You asked for it and here it is a site for pinions and as far as I can tell there not brass, and from bits and pieces from other sites there 0.5 Module:
http://www.ikarus-modellbau.de/onlineshop/usa/index.php?sid=ce0d8a01c1216638e5553a9e3231c35c&cl=alist&cnid=eae424149646c90f8.87942549

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

Just ordered some gears, Thanks!

< Message edited by []TEX[] -- 3/25/2007 4:29:26 PM >

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RE: MX450 XS Discussion Thread - 3/25/2007 4:21:02 PM   
[]TEX[]



Posts: 9355
Joined: 6/27/2006
From: Glencoe, IL, USA
Status: offline 		Maybe you guys have been here, but I use this sight for calculations.

http://www.readyheli.com/Online_Headspeed_Calculator_s/81.htm

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RE: MX450 XS Discussion Thread - 3/25/2007 5:11:10 PM   
Ace9


 

Posts: 131
Joined: 9/21/2003
From: Brandon, MB, CANADA
Status: offline 		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?

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RE: MX450 XS Discussion Thread - 3/25/2007 5:15:30 PM   
[]TEX[]



Posts: 9355
Joined: 6/27/2006
From: Glencoe, IL, USA
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quote:

ORIGINAL: Ace9

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.

< Message edited by []TEX[] -- 3/25/2007 5:16:05 PM >

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RE: MX450 XS Discussion Thread - 3/25/2007 5:18:48 PM   
osterizer


 

Posts: 1524
Joined: 3/10/2007
From: Sykesville, MD, USA
Status: online 		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.

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RE: MX450 XS Discussion Thread - 3/25/2007 5:33:12 PM   
[]TEX[]



Posts: 9355
Joined: 6/27/2006
From: Glencoe, IL, USA
Status: offline 		Great info site on flight training.

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

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RE: MX450 XS Discussion Thread - 3/25/2007 5:41:31 PM   
Ace9


 

Posts: 131
Joined: 9/21/2003
From: Brandon, MB, CANADA
Status: offline 		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.

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RE: MX450 XS Discussion Thread - 3/25/2007 5:45:27 PM   
[]TEX[]



Posts: 9355
Joined: 6/27/2006
From: Glencoe, IL, USA
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quote:

ORIGINAL: Ace9

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.

That would be painfull.

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RE: MX450 XS Discussion Thread - 3/25/2007 5:50:21 PM   
osterizer


 

Posts: 1524
Joined: 3/10/2007
From: Sykesville, MD, USA
Status: online 		Here's another calc page: http://dhrc.rchomepage.com/calcAdvanced.htm

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RE: MX450 XS Discussion Thread - 3/25/2007 6:06:34 PM   
sammy64


 

Posts: 174
Joined: 1/27/2007
From: Garland, TX, USA
Status: offline 		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 ....

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RE: MX450 XS Discussion Thread - 3/25/2007 6:33:58 PM   
[]TEX[]



Posts: 9355
Joined: 6/27/2006
From: Glencoe, IL, USA
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quote:

ORIGINAL: sammy64

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.

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< Message edited by []TEX[] -- 3/25/2007 6:34:17 PM >

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RE: MX450 XS Discussion Thread - 3/25/2007 6:34:06 PM   
osterizer