Lazy Cub Build Guide with Plans and Video - RC Groups
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Dec 09, 2014, 05:41 PM
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Lazy Cub Build Guide with Plans and Video


Recently I was approached to kit my Blazy Bee design, knowing that this was a foamie version of the Clancy Aviation Lazy Bee, I want it to be just a bit different so as to not step on any toes. Then the idea came to give a theme to this classic design making it all the more mine.

First the paint job. That would be easy, a simple Cub yellow paint job with the black lightening bolt and trade the polyhedral wing for a straight dihedral one. That looks pretty cool and very Cub-ish! Still it looked like a Blazy Bee with a Cub paint job.

Next I looked to the tail feathers. The horizontal stab and elevator were relatively easy. Just fit it into the same span as the BB and scale it fore and aft to closely duplicate the area of both surfaces. The rudder was another matter. The BB has an all flying rudder and the Cub does not. However this was a feature of the BB that I was not willing to compromise. I eventually ended up with a pleasant Cub-esque shape with an all flying rudder.

One more area that would be nice to change was the windscreen. The BB has a faceted one and I just did not think this would do for the Lazy Cub. So with some experimentation and trial I got a nice smoothly radiused one in its place that was easy to construct.

Some other details that would be nice to do are some engine cylinder heads and maybe wing struts. The motor details would dress up the nose nicely, and the struts would just give it more character, though they are not needed.

Another design goal was to make this kit package friendly as I want to offer kits to those who would like one. Often this is an after thought since the goal is to get to a model design that functions well, usually irrespective of shipping and material optimization. I am thankful this was achieved right from the start.

Got to fly it indoors today and it did not take long before it was sold. This plane just putters around at less than half throttle and was flying itself for nearly ten minutes hands off. I will get some video of that for you.

Plans and a build guide are forthcoming shortly. Until them, enjoy the short outdoor video and pictures.

Best wishes,
Ken

Lazy Cub Demo (1 min 23 sec)


https://youtu.be/7daTdKFFK9M?t=1m45s

Video of indoor demo here
Last edited by dz1sfb; Oct 26, 2016 at 04:09 AM. Reason: added video link
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Dec 09, 2014, 05:41 PM
Ken's CAD Models
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Plans and Specifications


Airframe Specifications;
Conventional Rudder, Elevator, and Throttle Controls
Wingspan 30.5
Wing Area 256 sq. in.
Length 21
Bare airframe weight 79g

Recommended Equipment:
Motor 16 - 20g 2000-2200 Kv Brushless Outrunner
Propeller 6x3, 7x3.5
Electronic Speed Control 10A
Battery 300 - 950 mAh 2s 7.4V
Servos Two 5g

Additional Hardware Required:
28 of .032 music wire and two Du-Bro #849 Micro EZ Links for pushrods.
One pair of 1.5 2 park flyer wheels.

Performance Specifications:
Ready to fly weight: 5-6 oz.
Flight duration 6-10 minutes

Additional information:
The center of gravity on this model is 2.625 from the wing leading edge.
Model may be flown with various batteries ranging from 300 - 950 mAh 2s lipo.
Control Throw Setup - Elevator and Rudder 0% expo at high (100%), 50% expo at mid (75%), and 50% expo at low (50%) rate.
Last edited by dz1sfb; Dec 16, 2014 at 09:02 PM. Reason: Updated featured planes
Dec 09, 2014, 05:41 PM
Ken's CAD Models
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Build Guide


Follow notes in pictures.
Last edited by dz1sfb; Dec 15, 2014 at 10:22 AM. Reason: Adding pictures
Dec 09, 2014, 05:41 PM
Ken's CAD Models
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future
Latest blog entry: Ken's CAD Models new web site
Dec 09, 2014, 05:42 PM
Ken's CAD Models
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Equipment Used in My Builds


I thought you would like some links to the equipment that I have used and or going to use in this model.

Ken

Motors;
E-Flite Park 250
Firepower Sport 250
On order to set up a couple of RTF units is the Turnigy Park 250
The Turnigy 2211 - 2300 Kv motor would be suitable as well.
Here is another suitable motor http://www.hobbyking.com/hobbyking/s...00kv_18g_.html

ESCs;
Turnigy Plush 6A
Turnigy Plush 10A

Servos;
HXT 500

Propellers;
GWS 6x3
GWS 7x3.5

Batteries;
Turnigy 300 mAh 2s
Turnigy 950 mAh 2s
Some other battery options include;
Turnigy 800 mAh 2s
Rhino 360 mAh 2s would be a great choice for lightweight floatiness.

Some Landing Gear hardware that I am using;
Tailwheel
Cub like Wheel
Last edited by dz1sfb; Dec 15, 2014 at 10:15 AM.
Dec 09, 2014, 08:33 PM
When pigs fly rc
rcrich's Avatar
Great job !!!!
I love it. Looking forward to the indoor video.
Rich
Dec 09, 2014, 09:22 PM
Ken's CAD Models
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Kits are available here http://www.kenscadmodels.com/lazy-cub.html

Ken
Last edited by dz1sfb; Dec 11, 2014 at 08:04 PM.
Dec 10, 2014, 08:45 PM
-S-
-S-
Just one more..... Just one...

Oh dear


I haven't even finished building all the kits I ordered not too long ago and now you do this :-)

The better question is WHY am I here looking for more planes.

Maybe I can talk the XYL into getting me one for Christmas!

Great stuff Ken, you have spoiled me with the kits.

- S
Dec 14, 2014, 10:19 AM
Ken's CAD Models
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The plans are now available in post #2.

Ken
Latest blog entry: Ken's CAD Models new web site
Dec 14, 2014, 02:08 PM
serial scratchbuilder
Granted's Avatar
Nice stuff Ken, many thanks!
Dec 14, 2014, 03:11 PM
-S-
-S-
Just one more..... Just one...
Momma just bought me a Lazy Cub!!!

I better go tell her

can't wait for the build!

Quote:
Originally Posted by -S-
I haven't even finished building all the kits I ordered not too long ago and now you do this :-)

The better question is WHY am I here looking for more planes.

Maybe I can talk the XYL into getting me one for Christmas!

Great stuff Ken, you have spoiled me with the kits.

- S
Dec 14, 2014, 03:57 PM
Ken's CAD Models
dz1sfb's Avatar
Quote:
Originally Posted by -S-
Momma just bought me a Lazy Cub!!!

I better go tell her

can't wait for the build!
Packaged and ready for the mailperson.

Ken
Latest blog entry: Ken's CAD Models new web site
Dec 14, 2014, 10:46 PM
skumgummi dave
Thank you Ken for the excellent plans. Very generous of you. Merry Christmas.

Dave-
Dec 15, 2014, 05:24 AM
Ken's CAD Models
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Thank you all for the compliments. You are sure to enjoy this docile relaxing flyer. I am looking at a number of models as a series of this genre.

Ken
Latest blog entry: Ken's CAD Models new web site
Dec 15, 2014, 06:02 AM
Registered User
Squall's Avatar
This is a very cool little plane Ken, thanks for sharing. Printing out the plans as I type


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