|Oct 14, 2012, 11:56 AM|
Mini StingRay for Indoor Streamer Combat with Plans and Video
Bz1mcr (Don) and I were invited to attend a Skymasters meeting this past Tuesday night to present what we do as Strong RC Motors LLC, Ken's CAD Models, and Model Plane Foam Inc. Also indoor streamer combat was discussed at length. Great meeting and lots of interest in this activity.
The StingRay got alot of attention, as many pilots there owned one. By the end of the discussion, the desire was to have a scaled StingRay if possible for this activity. To that end it is my pleasure to introduce you to the;
Wingspan - 24"
Wing Area - 137 sq. in.
Motor - 10g 2000 Kv
Propeller - GWS 6 x 3
Battery - Thunder Power 350 mAh 2s
Servos - HXT 5g units
Actual AUW - 110g w/17g motor
Control Throw Setup - Elevator and Ailerons 50% expo at high and low rates..25" low rate, .5" high rate.
There is 1 meter of .051" carbon fiber rod reinforcement, a 22.5" long 3mm carbon tube spar, and a 10.75" length of the same tube material longitudinally placed in the fuselage.
"Floats like a Butterfly and sting like Bee"
Enjoy the plans and scratchbuilding.
I am making kits available for $21.99 each which includes CNC cut "Model Plane Foam", laser cut control horns, hand cut firewall (until I get this sourced for laser cutting), and carbon spar and reinforcements.
To order a kit, go to www.kenscadmodels.com and click on Products tab then StingRays sub tab. You can order direct through the website. Shipping is through USPS Priority Mail.
Low rates should get .25" displacement up and down.
High rates .5" displacements. 50% expo at high and low rates.
Once you are comfortable at these settings, you can dial them up as you like.
Elevons are set at neutral, no reflex.
Depending on CG this could change.
Mini StingRay Flight Report
The first flight was with a Turnigy 2211 1700Kv motor. I do not have my 10g one yet. This motor was 17g on my scale. So, I could not help but put the first one up this morning since this is the first time I have had one of these Turnigy motors. Its pretty windy outside, so I opted for a 3s battery (Thunderpower 325mAh 45C 3s).
Of course I was not towing a streamer, but on 3s this thing is just ballistic. The CG was a little forward, and in power off it felt like I could not get enough up elevator, but that makes sense for a forward CG on these wings. This just lets me know it will tolerate a more aft CG which is fine. Under power though this was not very noticable. Plane tracks very solid like its larger sibliing and handled the wind without a problem in spite of being only 4 oz. Will test on 2s when we get out to the park.
This baby is going to be a hoot with the 10g motor. Less weight on the nose and probably can fly long enough with a 250 mAh battery for indoor streamer combat.
Edit 18-OCT-2012: Got the 10g motor on today and changed to a 6A esc. AUW dropped to 90g (3.17 oz.). Flew it indoors at work on lunch with a 5x3 prop. This is a very quiet motor, and the only noise you hear is the propeller. Easily staying aloft at less than half throttle. I was not able to really open it up, but the thrust to weight ratio is more than 1.38:1 (The reported thrust on HK is 4.375 oz with a GWS 5x3 at 7.4V). 3.0 A draw equals 22.2 watts input which if I have not made a mistake = 112 watts per lb. All this is based on the 3.17 oz. AUW.
Going to test one of these on there when it comes in. http://www.hobbyking.com/hobbyking/s...idProduct=7338
Source for Foam Tac Glue: https://www.signaturecrafts.com/cata...roducts_id=222
|Oct 15, 2012, 08:16 AM|
Joined Nov 2005
I notice you didn't do a KF wing. This might be the first time i can remember you doing a non-airfoiled wing... at least in a very long time.
Make sure you bring it with you when we finally meet up. I want to check it out!
|Oct 15, 2012, 09:07 AM|
The concept here is lightweight for indoor use.
I have a matched pair with me. Dueling wings!
I am excited to get the 10g motor on here along with the 250mAh battery. AUW will drop to 96g. could even go to less with a 6A esc.
|Oct 15, 2012, 09:30 AM|
|Oct 15, 2012, 08:48 PM|
I'm in! this looks cool, our indoor starts in aout 2 weeks I think i'll buid a few and pass e'm out to the boys jus so I fave someone to battle with
|Oct 18, 2012, 09:57 AM|
Quite tickled today. The 10g motor arrived yesterday, and this morning I got it all wired up to a 6A esc. Took the motor wire off the esc and soldered it direct, got the JST plug on and weighed the two components. 14g vs 28g for the 2211-1700 motor with a 10A esc combo. So now the AUW with the 10g motor, 5x3 prop, 6A esc and 250 mAh 2s battery is an even 90g or 3.17 oz. I am excited! Can't hardly wait until lunchtime to try it out.
|Oct 18, 2012, 01:24 PM|
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