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Old Jan 08, 2007, 10:00 PM
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New “Flash” from Super Zoom designer David Kyjovsky

UPDATE -- December, 2007

This thread started back in January of 2007 when I did a beta test on a prototype of this new model from David Kyjovsky. Since a lot has happened since it started, I decided to insert an update here.

The production model became available in August, 2007, and can be ordered from these distributors:

http://www.soaringusa.com/products/p...ategory_id=264

http://icare-rc.com/flash.htm

http://www.nesail.com/detail.php?productID=5654

The production model is a completely different color scheme from the prototype, and you can see it here:

http://www.rcgroups.com/forums/showp...&postcount=801

Some great videos of the Flash have been posted. Here's one of Zak West flying the prototype:

http://www.10374.com/3dbatix/videos/Flash-3D_0001.wmv

Another great video can be found here:

http://www.rcgroups.com/forums/showp...&postcount=588

Or, if it's snowing or raining outside, you can always fly it in your bedroom:

http://www.rcgroups.com/forums/showa...mentid=1502249


Basic Equipment needed:

4 HS-55 or equivalent servos

18-25 amp esc

900-1500 mAh 3 cell lipo

150-200 watt motor

micro receiver

People have successfully used several different motors on the Flash. Among the most popular are the AXI 2212/26, Hacker A20-22L, and Hyperion z2213-24. Depending on motor, battery, with or without landing gear, etc., people have come out with all up weights ranging from 12.7 oz. to 18 oz. The Flash flies well at both ends of this range – it’s largely a matter of personal preference how you want to set it up. This is a great flying model, and should be considered by anyone looking for a 3D foamie.

The build is very straightforward and easy. However, YOU MUST PAY CAREFUL ATTENTION TO STEP C! Look carefully at the drawing in the instructions! The wings are glued on with the back bone UPSIDE DOWN on the building board.

Four primary motor mount options have been discussed:

1. Standard using toothpicks per instructions.

2. Removable using wooden dowel and screws.

http://www.rcgroups.com/forums/showp...&postcount=347

3. Removable using plywood patches attached w/ toothpics and screws.

http://www.rcgroups.com/forums/showp...&postcount=695

4. Removable using CF tubes, threaded rods and nuts.

http://www.rcgroups.com/forums/showp...&postcount=936

Or you can dispense with the stock motor mount altogether, and mount the motor from the rear like the Super Zoom and Sniper:

http://www.rcgroups.com/forums/showp...postcount=3752

There is an error in the instructions where David forgot to put in the number for the CG (the instructions say XX). Here's a link to David's explanation regarding CG:

http://www.rcgroups.com/forums/showp...&postcount=296

************************************************** ********
Back to the Original Thread

I am a big fan of the Super Zoom, so when its designer David Kyjovsky announced that he had designed a “next generation” plane called the Flash, I sent him an email asking him when it would be available. I was delighted when he responded by offering to send me a kit for a beta test!

I am primarily a flyer and not a builder, but I am fortunate to know a gifted builder, Bill Sheppard (Oldcoot88 on these forums), who has served as “chief engineer” on many of my projects (in other words, he does all the work ). So I lined Bill up and, several long months of waiting later, David sent us the Flash.

Here’s a shot of the basic components. There were no instructions included, so we were on our own, but David supplied some photos of his prototype to give us an idea of what he had in mind. In this picture, the doublers have already been glued onto the sides of the fuselage, and the two piece wing has been glued together. You can see that, unlike the Super Zoom, the horizontal stab and elevator are made of EPP. Also, there’s a very nice carbon fiber landing gear.
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Last edited by Neil Morse; Feb 09, 2009 at 12:48 PM.
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Old Jan 08, 2007, 10:05 PM
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Neil,i'm very interested in seeing how it went together and flys,i'm also a very big fan of the Super Zoom.Olin
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Old Jan 08, 2007, 11:33 PM
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Here’s the hardware. Most of it is pretty straightforward, but what about that asymmetrical control horn? It’s for the pull-pull on the elevator. Since the hinge is on the top, the long side extends upward and the short side down, which puts the cable attachments equidistant from the hinge.

The thread is for the pull-pull on the rudder and elevator. The "cross-shaped" piece is the motor mount, and the large rectangular piece is the landing gear mount. The two white nylon pieces on the left are the rudder hinges.
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Old Jan 08, 2007, 11:58 PM
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Unlike the Super Zoom, the fuselage is notched in three places and corresponding tabs on the doublers fit into the notches. I wasn't able to restrain Bill long enough to take a photo of the doublers before they were glued on, but in this photo we've marked the location of the notches with blue tape to give you an idea of how it works. This is a great improvement over the Super Zoom and makes gluing on the doublers much easier. Bill used Gorrilla Glue.
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Old Jan 09, 2007, 12:01 AM
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Here, the landing gear has been slid into place to give you an idea of how it's attached. It will be bolted onto the fiberglass plate. The plate spreads the load from the gear and provides a sturdy attachment.
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Old Jan 09, 2007, 12:19 AM
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Ooooooh! Ahhhhhh! Nice! What the projected AUW? When will they be available? Thanks!
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Old Jan 09, 2007, 12:40 AM
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Nice use of materials (see post#3)

Looks like the kit uses alot of G10 garolite fr4 fiberglass as opposed to aircraft ply.

This material is great for aircraft use. Very light Very stong and durable.

I first came across this material upon building one of Davids other planes the Microbat. It was used in the motor mount.

I liked the stuff so much I ordered more from
http://www.mcmaster.com/
Type in the search box g-10 select garolite (appears just below the search box) then click on plastics and select grade g10/FR4 (type font blue)

Great choice of materials here.
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Last edited by Microbatman; Jan 09, 2007 at 12:50 AM. Reason: reference post #3
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Old Jan 09, 2007, 01:13 AM
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Quote:
Originally Posted by docphi
Ooooooh! Ahhhhhh! Nice! What the projected AUW? When will they be available? Thanks!
I think you can build this model at different weights depending on your choice of power system, and other equipment. Ours will be built for outdoor flying, and will come out around 18 oz. Wingspan and length are both 38".

I don't know about availability. Perhaps David can chime in with that information.

Neil
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Old Jan 09, 2007, 01:16 AM
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Here's a shot of the counter-balanced ailerons.
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Old Jan 09, 2007, 01:20 AM
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Like the Super Zoom, the model uses full lengh spars cut into the top and bottom of the wing and the full length of the fuse doublers on each side. The Super Zoom comes with aluminum rods for this purpose, but most people have used carbon fiber rods or flat carbon fiber instead. The Flash comes with four lengths of flat carbon fiber for this purpose. The result is a very stiff wing and fuse, and enables the Flash to fly with more precision than more "floppy" foam planes.
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Old Jan 09, 2007, 01:28 AM
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Here's the full airframe assembled with the cf installed. The cf application is very simple and easy. You just take a straight edge and make a slit in the foam with a fresh Xacto or razor blade, and then stuff the flat cf rod into the slit. Finish with CA and kicker and you're done. An advantage of EPP foam is that you can use regular CA. Additional cf was used across the elevator and diagonally across the rudder to add stiffness to these surfaces.
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Old Jan 09, 2007, 01:31 AM
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The motor mount is attached to the nose with toothpicks and Gorilla Glue. That's an AXI 2212/26. You can also see the landing gear attachment in this photo.
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Old Jan 09, 2007, 01:33 AM
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Another shot of the landing gear mounting plate.
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Old Jan 09, 2007, 01:42 AM
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That's all for tonight. Tomorrow I will take some more photos showing the servos and pull-pull installation, as well as the wheels and wheel pants.

Neil
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Old Jan 09, 2007, 09:45 PM
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Okay, we're back. Here are some shots of the pull-pull set up on the tail feathers. The extra long control horns were provided by David, and can be seen in the hardware photo above. Bill glued them onto the S75 long control horns we were using with our HS-55 servos, and used some kevlar thread to make sure the attachment was robust.
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