3DHS 85" Katana - RC Groups
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Oct 11, 2007, 02:06 PM
Use the 4S Luke
feathermerchant's Avatar
New Product

3DHS 85" Katana

OK I'll start the ball rolling. I got one of these from Ben back in March and built away. My Blog has all the gory details. I started with a Power 160 then an AXI 5330/28 an dnow a Hacker A60-18M. The prop is a 22X10 for now. Since the Hacker motor is a little heavier, I may ba able to go back to 8S and a larger prop.

The production models are a little different. They include:

Carbon fiber wing and stab tubes,
Phenolic control horns,
installed firewall,
canopy attaches with nylon thunb screws,
revised wing airfoil,
revised all ply battery tray,
a few ounces lighter.
Last edited by feathermerchant; Oct 11, 2007 at 02:23 PM.
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Oct 11, 2007, 03:40 PM
ExtremeFlight - 3DHS - Legacy
blucor basher's Avatar
Nice dog, Feather. That's just creepy.

The production 85" Katanas are in, we're working on documentation and a few details, and we'll have them up for sale by the end of the month for $549.

Feather's airplane is an early beta-tester (which he did an excellent job with and we appreciate it much). The production models have some significant changes:

Carbon wing tube
Carbon stab tube
Phenolic/ball link hardware
Revised plywood battery tray
Pre-assembled/bolted motor box
Revised carbon tailwheel bracket
Revised cowl mounting ring
Revised airfoil (courtesy of Scott Stoops)
Thumb-screw hatch attachment

Wing area is 1340 sq., weight w/ DA50 comes in a little less than 15lbs. RTF, with typical 12S 4000-5000mah electric, a little more than 15lbs. Looking forward to someone doing one w/ A123 to get that weight.

HERE is some video of Feather's and my 85" betas flying at BEST in South Texas last weekend. Both on A60M motors, CC110HV, 12S. Overall, I think the A60-18L is the best choice for the airplane, but since AeroModel was selling off the M's, they were hard to resist.

Here are some pics of the production plane, model is my lovely executive assistant/wife, Mrs. Basher, aka "most patient woman in the world".
Oct 11, 2007, 05:35 PM
Pro Bro #1008
birdie_in_texas's Avatar
Fuhreakin' Sweet..!!!
Oct 11, 2007, 06:41 PM
Use the 4S Luke
feathermerchant's Avatar
There were no pets harmed posting tha picture.
Hey Ben I see you've also added retractable landing gear to the production models!
I may have to sell something to make room for this one.

FYI Y'all won't have to substitute any hardware on this one. The hardware supplied is grade A.
Oct 11, 2007, 07:18 PM
Test your skills....fly IMAC!!
sun.flyer's Avatar
Guys I couldn't agree with you more on the FANTASTIC covering scheme and high quality hardware that Ben has included with the 3D Hobby Shop 85" Katana. It is by far some of the best that I have seen and Jim is right in saying that you definately do not need to replace any of the hardware or included parts.

Ben and I are going to use the 85" Katana for a very unique review opportunity here on RCG's that we hope will allow everyone to see the unique flexiblity that the Katana will offer those who purchase one.

More to come.......

Oct 11, 2007, 07:55 PM
r/c...the ultimate hobby!
redflyboy122's Avatar
love the color scheme!
Oct 11, 2007, 08:13 PM
davidsons's Avatar
Originally Posted by redflyboy122
love the color scheme!
2nd that....great job Ben!
Oct 11, 2007, 08:17 PM
ExtremeFlight - 3DHS - Legacy
blucor basher's Avatar
I have it easy, I only have to draw it and cover one of them that way. The techs in the factory make it happen hundreds of times. It's really amazing.

I figure we'll just put as much info as possible in here:

Servos -

5 control servos. 2 aileron, 2 elevator, 1 rudder.

We recommend a large servo on the rudder. JR8611 or Hitec HS-5955TG are my favorites. A long double-sided arm (like the Hangar9 or an SWB) is required on the rudder.

You can certainly use 4 other large servos on the other controls. The airplane feels great on 4 more 8611 or 5955, and on a big vibrating gas engine this would be wise. However, on smooth electric systems, I've had good luck on much less expensive servos such as HS-645 analogs on elevators and ailerons. You will miss out on that total locked-in, on-rails feeling of 5 X 5955, though.

Props -

I'm partial to the XOAR 24x10 on this one for 3D. Very smooth acceleration without lots of noise out of hover. It's not really enough pitch speed for precision maneuvers, though. 1/2 square or more pitch is much better for that. Feather gets very impressive results out of his 22x10 setup, though.
Last edited by blucor basher; Oct 11, 2007 at 10:00 PM.
Oct 11, 2007, 10:02 PM
davidsons's Avatar
WHAT...you don't personally hand cover every ARF you sell?
Oct 11, 2007, 10:09 PM
ExtremeFlight - 3DHS - Legacy
blucor basher's Avatar
<Sigh> it's true.
Oct 11, 2007, 10:15 PM
Use the 4S Luke
feathermerchant's Avatar
He's just being modest. You should see him with a hot iron and a razor blade.
Oct 11, 2007, 10:33 PM
Registered User
mpope1's Avatar
That black and white scheme on the katana really pops....
Oct 12, 2007, 01:33 AM
I used to be all thumbs...
NumbSkull's Avatar

Love those crazy kat'z.....

My wife is a real softy when it comes to stray animals. She's always feeding the little criters in the neighborhood, and they're all hanging around the house about the time I get home from work, eager to see what the misses will leave out for them that night.... Last night was no different... Well, I guess it was actually...

When I got home, there were a bunch of "kat'z" hanging out on my porch like usual, but this time... some of them weren't of the feline nature... And this one had no trouble finding a new home!!!!

Here's a few shots next to the ol' 47.
Oct 12, 2007, 01:35 AM
I used to be all thumbs...
NumbSkull's Avatar
Hey Ben,

I'm having a little trouble figuring out what this thing is...

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