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Old Feb 13, 2012, 10:01 PM
Power Wheels Guru
UNGN's Avatar
Southlake, TX
Joined Jan 2008
7,327 Posts
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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Old Feb 13, 2012, 10:54 PM
G G Ghost Pirates !!!
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USA, NC, Gastonia
Joined Dec 2001
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awesome ....
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Old Feb 13, 2012, 10:56 PM
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United States, CA
Joined Jul 2011
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Pretty cool, good luck on the maiden.
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Old Feb 14, 2012, 03:22 AM
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Shelby Twp, MI
Joined May 2006
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Absolutely beautiful, thanks for sharing.
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Old Feb 14, 2012, 07:07 AM
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UNGN's Avatar
Southlake, TX
Joined Jan 2008
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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
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Old Feb 14, 2012, 08:52 AM
0.9g retracts
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3" from insanity, 2' from the computer ,Richford, Tioga county, Southern Tier, New York, U.S., North American Continent, Northern hemisphere, Earth, The Sol System, Milkyway Galaxy, The Universe, The Current Dimension, Your Selected Realm of Reality.
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UNGN,

There's a UMX Spitfire coming out?!
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Old Feb 14, 2012, 11:01 AM
Gravity is a harsh mistress.
Tim Wolff's Avatar
United States, MI, Temperance
Joined Sep 2002
6,534 Posts
Quote:
Originally Posted by Yellow Baron View Post
UNGN,

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.
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Old Feb 14, 2012, 12:10 PM
Power Wheels Guru
UNGN's Avatar
Southlake, TX
Joined Jan 2008
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Quote:
Originally Posted by Yellow Baron View Post
UNGN,

There's a UMX Spitfire coming out?!
UMX Spitfire
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Old Feb 14, 2012, 01:35 PM
Wingnutz
Bill Quantock's Avatar
Canada, ON, Markham
Joined May 2009
271 Posts
Almost... STOL ing!

Quote:
Originally Posted by Andy2No View Post
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.
Upthrust->Flight!
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!"
Bill
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Old Feb 14, 2012, 04:26 PM
NaN
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Manchester, UK
Joined Nov 2005
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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.
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Old Feb 15, 2012, 05:05 PM
Wingnutz
Bill Quantock's Avatar
Canada, ON, Markham
Joined May 2009
271 Posts
Thrust vectoring...very cool!

Andy,
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.
Bill
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Old Feb 16, 2012, 10:04 AM
"Free" in Christ!
Free's Avatar
United States, CA, SF
Joined Jan 2012
850 Posts
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).
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Old Feb 16, 2012, 11:38 AM
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United States, WA, Kirkland
Joined Sep 2010
288 Posts
Quote:
Originally Posted by Free View Post
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.
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Old Feb 16, 2012, 11:53 AM
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Shelby Twp, MI
Joined May 2006
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Free,

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.
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Old Feb 16, 2012, 01:43 PM
"Free" in Christ!
Free's Avatar
United States, CA, SF
Joined Jan 2012
850 Posts
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.

Free
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