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Old Nov 17, 2011, 07:12 PM
Slipping the Surly Bonds
dz1sfb's Avatar
Attica, MI
Joined Dec 2006
10,978 Posts
Build Log
Dz1sfb Oshkosh Sport with plans

Finally got around to finishing up the planes for the Oshkosh Sport. It is similar to the Oshkosh Special in that it shares the same Undercamber wing for slow flying and light wind conditions, but is built with adding a KFm3 wing in mind. The fuselage is a little wider for larger fingers, and also features a fold up assembly design. This particularly suits the machine cut kits that are available as well. I will be publishing an optional tabbed construction fuselage pattern set, for more conventional scratchbuilding.

Features, Specifications, and Equipment:
  • Wider and shorter depth fuselage for bigger fingers.
  • Folded assembly fuselage for cleaner finished appearance.
  • Engineered nose structure. No monoblock required.
  • Intigrated servo mounts.
  • Top mounted horizontal stabilizer for ease of assembly.
  • Reinforced wing saddle area that is ready to be cut to accept flat bottom and KFm 2 or 3 wings.
  • Botttom mount battery at balance point. Facilitates a variety of battery sizes.
  • Wingspan = 40"
  • Overall length = 29"
  • All Up Weight = 11 oz.
  • Motor - 2208-12 1800 Kv outrunner
  • ESC - 18A combo with motor above
  • Servos - two 9 or 10g units
  • Propeller - GWS 9x5 HD
  • Battery - 900-1200 2s
Flight characteristics:
This has similar stability characteristics as the Oshkosh Special, but is more refined. with the shoulder wing there is less pronounced pitching up with increased thrust, and rudder rolls are more axial. Flys well in light to moderate winds (5-15 mph), but calmer air usually equalls calmer nerves.

Should a be a hoot with a KFm2 or 3 wing with ailerons or the newer Armin wing with ailerons if you're needing more control. Plans for a 38" KFm3 wing are included.

Getting 13 kits of this ready to send to Australia. BTW kits are available for $25 and comes with the UC airfoil baked into the wings, and are manufactured from Dow High Performance Underlayment layflat FFF. This is very nice material compared to the Big Box Store foam. Flatter, smoother, and comes with skin on both sides (which is removed for machining). Shipping averages $7 for a single kit to the CONUS.

Ken
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Old Nov 17, 2011, 07:49 PM
Gravity gets me down.
helicow's Avatar
USA, FL, Brooksville
Joined Jan 2008
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Nice. When I start mine, will take pictures. Thanks for starting this.

Bob
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Old Nov 17, 2011, 09:15 PM
Slipping the Surly Bonds
dz1sfb's Avatar
Attica, MI
Joined Dec 2006
10,978 Posts
I will put up some assembly pics as well.

Ken
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Old Nov 17, 2011, 09:25 PM
For us He died, in me He lives
Jimmy JFlyer's Avatar
United States, MI, Saint Clair Shores
Joined Dec 2008
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Very cool Ken. So I wanna hear more about the nose... no mono block eh? Do you think it will retain the same strength in the event of a nose in?

Definitely want to try the kf with ailerons. This should make a real nice aerobat.

Any vids to come?
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Old Nov 18, 2011, 05:28 AM
Slipping the Surly Bonds
dz1sfb's Avatar
Attica, MI
Joined Dec 2006
10,978 Posts
Quote:
Originally Posted by Jimmy JFlyer View Post
Very cool Ken. So I wanna hear more about the nose... no mono block eh? Do you think it will retain the same strength in the event of a nose in?

Definitely want to try the kf with ailerons. This should make a real nice aerobat.

Any vids to come?
Hi Jimmy,

It is stronger than a Monoblock. The guy that has the original is a total newb. I was able to give him one lesson. He would come into work and tell me how he dorked it and in every case of needed repair we simply replaced the firewall. He kept pushing the motor through the 1/8" lite ply. Finally we replaced the lite ply with the same thickness ABS plastic. No other problems since then. So I would recommend regular plywood over lite ply for the firewall. Changing a firewall is a bit of work without cutting the nose cheeks off.

When I post the plans for the non-folder fuselage I will also include parts options for tricycle landing gear.

Ken
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Old Nov 18, 2011, 08:34 AM
Gravity gets me down.
helicow's Avatar
USA, FL, Brooksville
Joined Jan 2008
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Ken, just curious here, since I normally always go with the recommended stuff first. The 9x5 prop would appear to be too much prop for the 2208-12 1800kv.

Are you just using good throttle management or maybe is the GWS 9x5 staying within the specs?

I assume the 1800 gives the sport a little more speed, but just a guess. Not an expert on motors by any means, so I normally go by specs (or watt meter).

Not trying to disagree here, just curious really - always learning.

Thanks,
Bob

By the way, there is a 2208-14 that does recommend the 9x5, but it is 1450kv - maybe not as speedy?
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Old Nov 18, 2011, 08:37 AM
Addicted to building...
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Omaha Nebraska
Joined Feb 2006
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Lurking in foamie school.
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Old Nov 18, 2011, 10:03 AM
Gravity gets me down.
helicow's Avatar
USA, FL, Brooksville
Joined Jan 2008
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Ken, I think I found the answer. I re-read your list and noticed the ESC had the word "combo" in it.

I think the motor is actually a B2208-12. I found the "combo" (out of stock) on LightFlightRC. Your prop is correct, as I should have expected.

Bob
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Old Nov 18, 2011, 12:23 PM
Slipping the Surly Bonds
dz1sfb's Avatar
Attica, MI
Joined Dec 2006
10,978 Posts
Quote:
Originally Posted by helicow View Post
Ken, just curious here, since I normally always go with the recommended stuff first. The 9x5 prop would appear to be too much prop for the 2208-12 1800kv.

Are you just using good throttle management or maybe is the GWS 9x5 staying within the specs?

I assume the 1800 gives the sport a little more speed, but just a guess. Not an expert on motors by any means, so I normally go by specs (or watt meter).

Not trying to disagree here, just curious really - always learning.

Thanks,
Bob

By the way, there is a 2208-14 that does recommend the 9x5, but it is 1450kv - maybe not as speedy?
Heres the package I've been using since LightflightRC is not restocking http://www.batteryheatedclothing.com...rop-Saver.html

On 2s the 9x5 prop she runs cool as a cucumber!

Ken
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Old Nov 18, 2011, 08:21 PM
Gravity gets me down.
helicow's Avatar
USA, FL, Brooksville
Joined Jan 2008
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I have to say that url is pretty funny.....checking it out..thanks..but then again, guess it gets cold up there :-)
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Old Nov 19, 2011, 06:25 AM
BOXFUSE KING!
Kronikpilot's Avatar
NO WIND CITY GUAM U.S.A
Joined Jan 2009
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Another cool looking bird! Awesome job as always sir ken!:d:

Albrt
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Old Nov 20, 2011, 10:39 AM
Slipping the Surly Bonds
dz1sfb's Avatar
Attica, MI
Joined Dec 2006
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Shipment to Australia

I finally got the shipment to Australia completed. Bruce keep your eyes skinned for this one.

Thought my friends here would like to see what 13 kits packaged looks like.

Ken
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Old Nov 20, 2011, 10:51 AM
AKA Don
bz1mcr's Avatar
United States, MI, Houghton Lake
Joined Dec 2002
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Congratulations Ken and Bruce.

Ken does such beautiful work even the shipping looks good!

No wonder his planes are flying all over the globe.

If one of these birds gets homesick it's a long flight!
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Old Nov 20, 2011, 11:11 AM
Slipping the Surly Bonds
dz1sfb's Avatar
Attica, MI
Joined Dec 2006
10,978 Posts
Thanks Don!

I just got the non folded construction templates up in the first post. That will help the folks who want to scratchbuild. Also updated the plans. I saw that I forgot to put the release date along with the length and weight spec's.

Ken
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Old Nov 20, 2011, 11:59 AM
Addicted to building...
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Omaha Nebraska
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That packing job looks like 'Christmas in Australia' and someone is going to be very happy when that box arrives! Ken, you are the 'machine'.

Fred
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