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Nov 17, 2011, 06:12 PM
Ken's CAD Models
dz1sfb's Avatar
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
Last edited by dz1sfb; Nov 20, 2011 at 10:08 AM.
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Nov 17, 2011, 06:49 PM
Gravity gets me down.
helicow's Avatar
Nice. When I start mine, will take pictures. Thanks for starting this.

Bob
Nov 17, 2011, 08:15 PM
Ken's CAD Models
dz1sfb's Avatar
I will put up some assembly pics as well.

Ken
Latest blog entry: Mini H Quad Project
Nov 17, 2011, 08:25 PM
For us He died, in me He lives
Jimmy JFlyer's Avatar
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?
Nov 18, 2011, 04:28 AM
Ken's CAD Models
dz1sfb's Avatar
Quote:
Originally Posted by Jimmy JFlyer
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
Latest blog entry: Mini H Quad Project
Nov 18, 2011, 07:34 AM
Gravity gets me down.
helicow's Avatar
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?
Nov 18, 2011, 07:37 AM
Addicted to building...
Freddie B's Avatar
Lurking in foamie school.
Nov 18, 2011, 09:03 AM
Gravity gets me down.
helicow's Avatar
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
Nov 18, 2011, 11:23 AM
Ken's CAD Models
dz1sfb's Avatar
Quote:
Originally Posted by helicow
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
Latest blog entry: Mini H Quad Project
Nov 18, 2011, 07:21 PM
Gravity gets me down.
helicow's Avatar
I have to say that url is pretty funny.....checking it out..thanks..but then again, guess it gets cold up there :-)
Last edited by helicow; Nov 18, 2011 at 07:27 PM.
Nov 19, 2011, 05:25 AM
BOXFUSE KING!
Kronikpilot's Avatar
Another cool looking bird! Awesome job as always sir ken!:d:

Albrt
Nov 20, 2011, 09:39 AM
Ken's CAD Models
dz1sfb's Avatar

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
Latest blog entry: Mini H Quad Project
Nov 20, 2011, 09:51 AM
AKA Don
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!
Nov 20, 2011, 10:11 AM
Ken's CAD Models
dz1sfb's Avatar
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
Latest blog entry: Mini H Quad Project
Nov 20, 2011, 10:59 AM
Addicted to building...
Freddie B's Avatar
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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