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Author Topic: New .15 KittyCat  (Read 1418 times)

Offline Mike Anderson

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New .15 KittyCat
« on: May 10, 2016, 07:09:58 PM »
Just finished up a new .15 Profile for this year -- Basically it is an electric version of the model in this photo:

http://stunthanger.com/smf/carrier/15-carrier-at-hunterville/msg405252/#msg405252

In looking back, I found I've been flying that model for a lot of years (found mention of it in a post from 2008!).  It is built from a Cartier foam wing (Lil Hacker) and is 'sorta' scale of a Grumman Wildcat.  It has had 4 or 5 different engines on it and has been flown by many others besides myself.  Last year, I took it to the Nats and if I had been able to get anywhere near the speed limit, I might have given Eric or Burt a run.  Still had a very nice flight.  So ... time to try and improve it.

This one is closer to a scale Wildcat and the electric motor promises to outrun any of the glows I own.   It has a NTM 3536-1400, running on 4 cells, with an 8-5.5 Carbon prop.  Turns it at 18000 rpm, and draws 55 amps at high speed.  I did some test runs this afternoon, and after 30 seconds of High speed, I ran 4 1/2 minutes at 25 amps which I estimate will be the current draw at a very nose high attitude and during a landing approach.  When I started a recharge, I was at 30% charge, so there is even room for more if needed.

I'm using the new Hyperion "High Voltage" LiPo's, which require a special charger.  These are somewhat lighter and have a higher capacity than 'normal' lipos.  Instead of 2200 mah, these are rated at 2400.

I'm looking forward to a chance to fly it before our June contest - but the wind here has been off the charts all spring.

The battery sits on a plywood shelf (tied into the fuse) under the wing cutout - that bridge-like piece over the battery replaces the removed section of top-spar.  The ESC is mounted to the bottom of the shelf with tie-wraps.  

I was actually playing around with some other ideas on this one - so the wing is foam covered with a polyester fabric and elmers glue.  Then I ironed on some of the Cartier SLC (and the tail surfaces), scuffed it with scotch-brite and sprayed on Rustoleum.  After the stickers were added, I sprayed with Rustoleum Satin Clear.  Final weight is 30 oz.
Mike@   AMA 10086
Central Iowa

Offline Russell Shaffer

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Re: New .15 KittyCat
« Reply #1 on: May 10, 2016, 09:12:17 PM »
Lots of interesting ideas here.  I like the plywood spar replacement idea - think I will steal that one.  Are you using a standard tail hook or a tailskid type?  Oh, and it looks really, really great.
Russell Shaffer
Klamath Falls, Oregon
Just North of the California border

Offline Mike Anderson

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Re: New .15 KittyCat
« Reply #2 on: May 10, 2016, 09:52:39 PM »
.......  Are you using a standard tail hook or a tailskid type?  ...

I use a normal, drop-down hook.  I find that tail-skid types sometimes bounce over the lines, and don't settle down again until the last line is passed.  I drop the hook with down elevator.  When not flying off a deck (like practicing over grass), I use a small music wire hook to keep the the tail hook from dragging in the grass.  In the pic it looks like the tail hook would never drop, but in actual use, you have to push the tail hook firmly up against the fuselage to get it into the 'holster'.
Mike@   AMA 10086
Central Iowa


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