show off those ar6400 planes! - Page 154 - RC Groups
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Feb 13, 2012, 11:01 PM
Power Wheels Guru
UNGN's Avatar
Here's my Spitfire made from $20 worth of NE foam parts + a Broken UM Mustang + a Mossy Prop and spinner.

It will tide me over until July when the new UMX spitfire comes out.

Hope to maiden it this week.

AUW is 36.3g with a HK 160 nanotech, so it shoud fly pretty good.
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Feb 13, 2012, 11:54 PM
G G Ghost Pirates !!!
Vyceroy's Avatar
awesome ....
Feb 13, 2012, 11:56 PM
Registered User
UltraMicro's Avatar
Pretty cool, good luck on the maiden.
Feb 14, 2012, 04:22 AM
Registered User
dbacon's Avatar
Absolutely beautiful, thanks for sharing.
Feb 14, 2012, 08:07 AM
Power Wheels Guru
UNGN's Avatar
I really didn't do anything but tape/glue it together and extend the mustang pushrods with some wire.

I didn't whant to buy a RTF because shipping was $20 more.

Here are links to the parts to make your own Spitfire:

Fuselage - $6.50
Wing - $6.50
Tail - $4
Feb 14, 2012, 09:52 AM
Back in the game.
Yellow Baron's Avatar

There's a UMX Spitfire coming out?!
Feb 14, 2012, 12:01 PM
Gravity is a harsh mistress.
Tim Wolff's Avatar
Originally Posted by Yellow Baron

There's a UMX Spitfire coming out?!
His is just over 10g lighter than the flying weight listed for the upcoming ParkZone Spitfire.

I'll take 10g lighter over a 3 axis gyro any day.

Edit: Thought you were informing not asking. I should read previous posts more thoroughly.
Last edited by Tim Wolff; Feb 14, 2012 at 02:10 PM.
Feb 14, 2012, 01:10 PM
Power Wheels Guru
UNGN's Avatar
Originally Posted by Yellow Baron

There's a UMX Spitfire coming out?!
UMX Spitfire
Feb 14, 2012, 02:35 PM
Registered User
Bill Quantock's Avatar

Almost... STOL ing!

Originally Posted by Andy2No
Could it be nose heavy? Or too much down thrust, maybe, or possibly both.

I've had that experience with a 200g triplane I made (there's a video somehwere). I just had way too much down thrust due to a high motor position, though the CG was about right. It scooted around on the floor at high speeds without lifting off, so I decided to chuck it - bad idea. It nose diived into the floor a few feet away. So, I figured out it was the thrust angle and pointed the motor up quite a bit (actually above horizontal). It then flew beautifully - straight into a basket ball net that hadn't been retracted into the ceiling. I've been meaning to fix it for a couple of years now.
Andy, I think you may have been on the right track!
"Been testing various theories about why my scratch-built 33" indoor Storch won't take off. I've cleared obstacles out of a 60' "runway" in my basement and have been roaring (buzzing actually) down this makeshift flying field trying to lift off...finally lift-off! (followed immediately by a harmless crash into my workbench).
After increasing wing incidence, cutting off the STOL slots, increasing down and right thrust, testing motor RPM, trying a different wing, I finally decided to try upthrust to see if the drag from that gangly landing gear was pulling the nose down.
Now I need a gymnasium or a REALLY calm day to see what happens once the Storch achieves more than 18" altitude!
Beginning to STOL!"
Feb 14, 2012, 05:26 PM
Andy2No's Avatar
Excellent. Glad to hear it, Bill.

The first couple of inches is the hard part... Okay, there's clearing the ground effect too, but that's optional

The only problem I've found with flying really low in a gym is that it's where the planes that are being flown badly end up crashing, and your plane breaks their fall.

Here's that problematic triplane project I was talking about. Unfortunately, I didn't capture the few glorious seconds when it actually flew, before hitting the basket ball net:

4 Fiks - 2D Vectored Thrust EPP Triplane 1 (0 min 21 sec)

4 Fiks - 2D Vectored Thrust EPP Triplane 2 (0 min 39 sec)

4 Fiks - 2D Vectored Thrust EPP Triplane 3 (0 min 15 sec)

I still have the airframe though. I'll probably just add a conventional rudder and elevator, one day.
Feb 15, 2012, 06:05 PM
Registered User
Bill Quantock's Avatar

Thrust vectoring...very cool!

Loved the videos...I've never seen TV done quite that way! Your Triplane 2 video reminded me of the Storch tearing around the gym floor! Will try playing with horizontal stab incidence too.
Feb 16, 2012, 11:04 AM
"Free" in Christ! #F3P
Free's Avatar

First 3D

Here is my first AR6400 plane, it was flimsy, heavy, had small wing area, the CoG was to far back, and I was a bad pilot.(It did not last long).
Feb 16, 2012, 12:38 PM
Registered User
numanair's Avatar
Originally Posted by Free
Here is my first AR6400 plane, it was flimsy, heavy, had small wing area, the CoG was to far back, and I was a bad pilot.(It did not last long).
"A nose heavy plane flies poorly; a tail heavy plane flies once."
If that entire tail surface pivots, it is likely too stubby and/or not close enough to being aerodynamically balanced.
Feb 16, 2012, 12:53 PM
Registered User
dbacon's Avatar

I applaud your effort. A large percentage wouldn't have made it that far. So this demonstrates your drive, and commitment, all we con do is improve from here.

I'll bet the only problem you needed to address was the COG. Maybe a little more rudder...

I hope you stay with it, it is a great hobby and we need you!

You might build a Capricorn for pilot skill development, they fly slow and easy.
Of course there is always the Vapor, an RTF that flies slower than I think... They are popular in my club.

P.S. I worked with a guy named Free, in the service, Charlie Free, great guy, very helpful to me as a newbie AC Mechanic.
Feb 16, 2012, 02:43 PM
"Free" in Christ! #F3P
Free's Avatar
Thank you dbacon and numanair,

Actually I built that about a year ago for a science fair. I have now gotten into a

habit of building a plane, flying it twice, taking it apart and repeating the process.

If you look on page 134 and 135 you can see some of my other planes.

I have built about 10 different AR6400 aircraft so far.


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