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Jun 28, 2009, 02:01 AM
Park Jet Guru
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Polaris Seaplane Parkflyer


This model is a foam parkflyer adaptation of Laddie Mikulasko's beautiful Northstar seaplane. I named it Polaris to pay homage to the original (for those that don't know, Polaris is the astronomical name of the real North Star). This design is mostly faithful in outline to the original, but I did make a few modifications to adapt it to foam construction, electric propulsion, and to better suit the parkflyer role. This model handles beautifully in the air, and is smooth, stable and very aerobatic. It also has excellent water manners--tracks well, steers well, and lifts off effortlessly. It also flies well off of snow or grass, making it a very versatile model.

Specs:
Wing area: 343 sq in
Span: 29.0"
Length: 38.4"
Weight RTF: 20 oz
Wing loading: 8.4 oz/sq ft
Motor: Grayson 2212-06
Battery: Thunder Power 2100 mAh 11.1V Prolite
Prop: APC 6x4
Current: 22 amps
Watts: 240 watts
Power loading: 190 watts/lb
Flight controls: Elevator, ailerons, rudder

I used a Grayson 2212-06 motor, which is a perfect match for this airframe. It provides 1.3:1 thrust-to-weight ratio for unlimited vertical and roughly 70 mph top speed. Plus the small 6" diameter prop keeps the thrust line low to minimize the effects of the high thrust line. This model was designed to accommodate up to a 7" diameter propójust mount the motor at the bottom of the firewall if using a 6" prop and at the top of the firewall if using a 7" prop.

When set up as recommended, this model has very little pitch trim change with throttle, even though it has a high thrust line. That's primarily because both the motor and horizontal stabilizer are installed with -2 degrees incidence. The low speed controllability of this model is especially good due to the location of the prop in front of the elevator and rudder, allowing it to turn easily on water, snow or grassóor fly at high alpha with excellent control.

Build thread: https://www.rcgroups.com/forums/showthread.php?t=922465

Construction guide: See PDF file attached below

Kits available at: http://www.modelaero.com/

Here's a link to a fantastic review on Ezone by Jon Barnes of the Model Aero Polaris kit: https://www.rcgroups.com/forums/showthread.php?t=954314

Flight videos (off both water and snow):
(5 min 0 sec)


(3 min 31 sec)
Last edited by jetset44; Jan 21, 2012 at 01:45 AM.
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Feb 02, 2010, 11:20 AM
Was a lookin fer loomyum foral
Chophop's Avatar
I'd like to build one but for now I have two Quick-1 kits sitting for a year, similar to the Aero Cat. I would like to modify the engine mount to be like the Polaris or Aqua Cat.
The question is how much and what direction of thrust offset would it need ? The current thrust line is down the middle. Plans are for a 6 to 8 inch prop.
Feb 02, 2010, 03:00 PM
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I used -2 degrees downthrust on the Polaris, which worked very well.
Feb 02, 2010, 06:26 PM
Was a lookin fer loomyum foral
Chophop's Avatar
Thanks, I was going to start with one degree , front of prop pulling down since it's on the back side of the CG.
I'm surprized that Polaris isn't a huge hit instead of simply popular. It can fly off of about any surface.

Ch
Sep 12, 2010, 01:07 AM
Registered User

thanks


Steve: just a thanks for all your ideas and plans that you unselfishly give to the rc community. I am handicapped and will never get to fly your designs, but I DO look at each and everyone and pretend that I am building and flying your designs. I am pushing 70 yrs old now and have seen quite a few changes (over the past 35 yrs). when I was flying rc gliders in LaJolla, Ca. I flew with the Smiths that built a glider that looked like a seagull and was shot for the movie "Jonathan Livingston Seagull". The Smiths designed and sold a popular glider called the windfree. Cheers, Lou
Sep 12, 2010, 01:12 AM
Park Jet Guru
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Thanks for the kind words, Lou!

Steve
Oct 29, 2010, 07:54 PM
Registered User

Material


I was wondering if Owens-Corning Fan-Fold Foam would work instead of using Depron for the Polaris. I have built 3 jets and it seems to work well on these.
Oct 29, 2010, 10:07 PM
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Yes, fan fold foam will work just fine for the Polaris.
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