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Old Dec 08, 2005, 03:43 PM
The Aviator
Mankato, MN
Joined May 2005
360 Posts
Build Log
Douglas X-3 "Stiletto" for EDF Contest

Since no one has claimed to have built an EDF version of this A/C, I have used the 48 hour "grace" period to get started.

I used the 3-view in Jay Miller's "X-Planes" and pictures found on the Internet for starters.

Specs are:

1/16th scale
16.7" wingspan
48.75" OAL (45" w/o the pitot "spike")
(2) Microfans w/brushless motors
2100 3s Li-Po
Estimated weight - RTF 22 oz. (It may actually may come out lighter! )
Construction-mostly 2mm "formed" depron
Actual "wing area" is a whopping 55 sq. in.! (We hope for some lift from the fuse area!)
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Old Dec 08, 2005, 03:48 PM
Watts your motivation
roccobro's Avatar
San Bernardino, CA
Joined Aug 2003
6,512 Posts
Ooh. Your really pushing it Froggy!

Justin
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Old Dec 08, 2005, 03:56 PM
The Aviator
Mankato, MN
Joined May 2005
360 Posts
Plans are pretty well done (sorry-no 3-D CAD ). I plan on using functi
onal L.E. and T.E. "flaps" per the prototype to add some "undercamber" as required for low speed flight. T. E. will be configured as "flaperons", mixed via the Tx.
In order to "form" the depron shell, I will carve a balsa fuselage plug. Other details as the build progresses.
The plastic model is a Revell kit circa 1957. I remember building one of these as my "first" plastic kit. Yeah, I was 10 at the time!
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Old Dec 08, 2005, 04:10 PM
The Aviator
Mankato, MN
Joined May 2005
360 Posts
I decided that this build warranted a bit more than the usual small scale "chuck" model, so I built a "FSD" (full scale development) model out of 6mm depron.Douglas would be pleased, I am sure! Amongst other things, it allows me to verify the balance point, plan component location and inspire me to keep working on the thing. It has hinged control surfaces, full flying stab, and enough carbon fiber to withstand expected flight loads. Yes, I plan on installing servos and fans and flying it!
It actually "flies" quite well already (at 2 oz.!). I may have Vintauri videotape me hand launching it - Does this qualify for "points" on the "proof of flight" rule, Martin?
It has already helped me to move the fan ocation on the plans an inch forward.
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Old Dec 08, 2005, 04:13 PM
The Aviator
Mankato, MN
Joined May 2005
360 Posts
Pix of FSD

Pix!
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Old Dec 08, 2005, 04:17 PM
Watts your motivation
roccobro's Avatar
San Bernardino, CA
Joined Aug 2003
6,512 Posts
No grass grows under your feet!

Good stuff!

Justin
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Old Dec 08, 2005, 04:24 PM
The Aviator
Mankato, MN
Joined May 2005
360 Posts
Quote:
Originally Posted by roccobro
Ooh. Your really pushing it Froggy!

Justin
Me? Push it? It is actually based upon a Piper Cub. Note the lack of dihedral and flat bottomed airfoil!

DA
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Old Dec 08, 2005, 04:34 PM
The Aviator
Mankato, MN
Joined May 2005
360 Posts
Quote:
Originally Posted by roccobro
No grass grows under your feet!

Good stuff!

Justin
Grass? This is Minnesota, remember? See recent (5 minutes ago!) picture taken out my front window. Remember the F-117 "lawn dart" video? Imagine a white X-3, bungee launched in the snow

DA
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Old Dec 08, 2005, 06:24 PM
EDF rules... :)
AirX's Avatar
Joined Nov 1999
13,580 Posts
Another project worthy of your talents....

Eric B.
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Old Dec 08, 2005, 11:38 PM
Registered User
RCParkflyer's Avatar
Racine, WI AMA# 809291
Joined Nov 2003
5,856 Posts
Man this should be a GREAT Project

You need to go to Dayton Oh and visit the real one!!!
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Old Dec 09, 2005, 12:21 AM
The Aviator
Mankato, MN
Joined May 2005
360 Posts
Actually, I have been there! But it has been a few years!

DA
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Old Dec 09, 2005, 12:27 AM
The Aviator
Mankato, MN
Joined May 2005
360 Posts
Actually, I have been there! But it has been a few years!

DA
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Old Dec 09, 2005, 12:31 AM
SoCal, Year Round Flying!
bmiller's Avatar
Newport Beach, CA
Joined May 2002
5,745 Posts
Very cool project!
Looking thru the Oct-Dec 2005 issue of JETpower and it has an x-planes article including the X-3 Stiletto...
With those tiny wings, the liftoff speed was 420km/hr!
Can you scale up the "wings" alittle or flatbottom the fuse for more lift?
or is that against the rules?
Regards,
Bruce
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Old Dec 09, 2005, 12:51 AM
The Aviator
Mankato, MN
Joined May 2005
360 Posts
Bruce:

Nothing is really "against the rules"! The contest is for A/C that have not been built/flown as an EDF-whether "scale" or "fantasy". It does have a fairly "flat bottom" and I intend to take "advantage" of that. Originally, Iwas thinking I would build (2) complete wing sets - one "scale" and one "somewhat larger". Now my plan is to "ballast' the "FSD bird" (with the "scale" wings) and see what happens! At least 3/4th's of the "challenge" to a scale modeller is to be able to say "Yes, the outline is exact scale". Besides, the span/length ratio is so ridiculously(sp?) disproportionate....I don't want to spoil it!

DA
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Old Dec 09, 2005, 05:09 AM
Ozzie Express wiggy pilot
SON OF PALEFACE's Avatar
YANKALILLA , SOUTH AUSTRALIA.
Joined Nov 2002
5,234 Posts
Quote:
Originally Posted by froggy117
Since no one has claimed to have built an EDF version of this A/C, I have used the 48 hour "grace" period to get started.

I used the 3-view in Jay Miller's "X-Planes" and pictures found on the Internet for starters.

Specs are:

1/16th scale
16.7" wingspan
48.75" OAL (45" w/o the pitot "spike")
(2) Microfans w/brushless motors
2100 3s Li-Po
Estimated weight - RTF 22 oz. (It may actually may come out lighter! )
Construction-mostly 2mm "formed" depron
Actual "wing area" is a whopping 55 sq. in.! (We hope for some lift from the fuse area!)
I know someone will tell me I've got my maths wrong, anyway here goes
1sq/ft= 144sqins
divided by 55sqins = 2.6
2.6 x 22oz = 57.5oz / sqft ????
ROTSA RUCK
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