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Old Oct 18, 2005, 08:08 PM
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glen's Avatar
new zealand
Joined Sep 2003
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Question
Building a light x-400

I want to build a light x-400 for indoor use. Not worried about 3D (at this stage) as I have a raptor 50.
Any suggestions?
I've been told to get a 450 motor at 100 grams but it'll apparently hover at about 1/3 throttle so why not get a 400 size motor at 60 grams? I thought a 1500 mah battery and perhaps the carbon sides would take off another 50 grams.
(This lot would save around 100-150 grams alone)
Anyone done this and have comments or suggestions?

I want it for practicing nose in, circuits and other SCALE type flying in a RELAXING manner. (given up on my piccolo. To fidgety.)

Glen
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Old Oct 18, 2005, 09:19 PM
2 Turbos...Nope 1 Big one
skeppley's Avatar
United States, PA, Lake Wynonah
Joined Aug 2004
1,801 Posts
Use a 400DH motor, only 42 grams!
http://www.justgofly.com/tech400dh.htm

Use Bluebird 306BB servos, only 6.6 Grams:
http://www.balsapr.com/catalog/Servo...ductId=U295828

And a light weight 25 amp Speed control
and the Carbon Fiber eCCPM frame kit, and you will have a very light heli that will be able to fly with a 1320 Lipo.

Here are some weight differences without the CF frame, that saves about 25 more grams:
http://www.rcgroups.com/forums/showthread.php?t=426150
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Old Oct 18, 2005, 09:22 PM
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For 435grms trwx
http://www.rcgroups.com/forums/showthread.php?t=358849

And the 400 dh perfect!.
the biggest weight saving is in the frame(use stock if you can and lighten, not sure about the x400 one though), electronics and add on pice ie landing gear,fins etc(stock fin 6 grams custom 2 grams,8 gram saving.
Make the tail light! so you can balance with a 1320 pack.
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Last edited by Snott; Oct 18, 2005 at 09:27 PM.
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Old Oct 18, 2005, 09:27 PM
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glen's Avatar
new zealand
Joined Sep 2003
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1320 - even better.

I am getting the swash and head upgrades which will add some weight.

Any other things that can be done to cut weight and comments on the standard wooden blades. Are there better or other flat bottomed blades which will give better lift? (for loops and rolls outdoors, no inverted hovering or 3D)

Glen
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Old Oct 18, 2005, 10:02 PM
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Joined May 2005
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that's crazy x400 indoors??? i hope you have a big house or something.

ive flown mine indoors and it's absolutely nerve wreckin. the heli is just way too powerful for indoors. the air movement/turbulance it generates blows everything away including itself. i know the heli has enough power to wreck itself and anything it crashes into.

look into some nice blades. maybe put some Like90 272mm blades onto it. Smaller, less drag, and supposedly higher lift efficiency - should work well with a lightened x400. need to upgrade to Trex bladegrips tho.
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Old Oct 19, 2005, 12:26 AM
That tree again!!!!
thanhTran's Avatar
Germantown, MD, US
Joined Sep 2004
6,642 Posts
Quote:
Originally Posted by skeppley
...
Use Bluebird 306BB servos, only 6.6 Grams:
http://www.balsapr.com/catalog/Servo...ductId=U295828
...
Hi Shane,
How is this servo compared to the HS56? Does it break the gear often in crash? I looked at balsarProducts but couldn't see they offer gear set replacement for this servo.

thanks

thanh
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Old Oct 19, 2005, 07:53 AM
2 Turbos...Nope 1 Big one
skeppley's Avatar
United States, PA, Lake Wynonah
Joined Aug 2004
1,801 Posts
The gearsets are around $2.00
I bought some as spares but havent needed them.
In the one bad crash i had, the case opened up on the sevo and the gears fell out, but didnt strip at all. They wont have the power of the larger servos, but they center better. Running eCCPM, they have more than enough power. They are leaps and bounds better than the Hitec 55's.
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Old Oct 19, 2005, 11:11 AM
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College Station, TX USA
Joined Dec 2003
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The gears are exactly the same as the GWS Pico, I am using them in a Shogun, tey have nice performance, but I really wouldn't use them if you want to 3D, which you are not, so there is not point why you couldn't use them! They are very fast and center well as Skeppley said! I also use them in all my foamy airplanes.
Keep'em Flying,
Nick
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Old Oct 19, 2005, 12:05 PM
That tree again!!!!
thanhTran's Avatar
Germantown, MD, US
Joined Sep 2004
6,642 Posts
Thanks Shane & Nick

I was wondering how tough it is compared to the HS56 servos. If you talk about 3D, do you feel comfortable doing it with the HS56 servos? I want to have a sense of servo strength & reliability.

The HS56 has krabonite gears but I still got gear stripped every now and then and being oddsize & needed special mounting, it takes forever to fix it on the ARK.

Oh Nick, saw your picture (the one on your avatar). That's a huge nice heli there. My wife mucked me saying I could ask you to trade it with my Trex

thanh
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Old Oct 19, 2005, 03:04 PM
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glen's Avatar
new zealand
Joined Sep 2003
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No I'm not flying in a house.
I run an indoor flying group and will be using it in there.

http://homepages.slingshot.co.nz/~ga...nformation.htm

Cheers
Glen
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Old Oct 19, 2005, 03:45 PM
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College Station, TX USA
Joined Dec 2003
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I though the servos felt nice, but, no the HS-56s feel much more solid and more authority. If you can sacrifice the weight gain somehwere else I would use the HS-56s. I think as long as you are not running metal gears you will be able to strip them out in a crash. But at least that breaks and not something even more expensive.
Thanks or noticing the gas heli! That is an X-cell 1004SE. Nice FAI ship.
I really like your night blades. I am currently working on a set with some friends...oh wiat actually they are doing most of the work, I just supply them with blades.
Keep'em Flying,
Nick
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Old Oct 19, 2005, 04:06 PM
That tree again!!!!
thanhTran's Avatar
Germantown, MD, US
Joined Sep 2004
6,642 Posts
Thanks very much for the info Nick

And show us the night blades when you finish

Thanh
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Old Jul 16, 2006, 09:46 AM
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Joined Jun 2006
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I would not fly this indoors unless it was a gym or something. Good luck.
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