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Author Topic: CATAJETS: Design and Development  (Read 57210 times)
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tross
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« Reply #675 on: July 31, 2018, 09:22:11 PM »

No problem John, Smiley
Expected for a free flight glider maybe, but not so great I know. Terrible on purpose. Tongue
The entire outer panel is used for holding the wing section up at 2┬░as the outer elevon doesn't have enough yank (and is draggy).
The outer elevon would of course help with any slight pitch adjustment but would also affect the yaw trim which is sensitive.

Tony
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Instructions: Step One...Assemble the pile of sticks shown in pic "A" to look like the model airplane shown in pic "B"........
Maxout
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« Reply #676 on: August 07, 2018, 12:56:56 PM »

Well folks, Steven Wrigley has topped everything, and I do mean everything. At my suggestion, he drafted up the most insane Jet Cat model ever and sent me the laser files to test it out. Ladies and gentlemen, I present to you the Caspian Sea Monster!

Yes, it flies.
https://www.youtube.com/watch?v=nB0ddLulmrU&t=6s
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MKelly
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« Reply #677 on: August 07, 2018, 02:23:15 PM »

Awesome!  Is it 15 bonus point on that thing (5 for canard and 10 for all the engine pods)?

Mike
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dslusarc
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« Reply #678 on: August 07, 2018, 02:31:50 PM »

That's awesome. I smell a new potential FAC rule in the making if this one starts to win. Smiley
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Maxout
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« Reply #679 on: August 08, 2018, 08:09:40 AM »

Awesome!  Is it 15 bonus point on that thing (5 for canard and 10 for all the engine pods)?

Mike

I forgot about the canard. The way the rules are written, you get points for any "pods" on the aircraft, so the wingtip pontoon/stabilizer thingies also count. So 17 BP. Probably the most of any jet cat model to date.  Grin

The proposed Beriev Be-2000 would have been a close contender.

That's awesome. I smell a new potential FAC rule in the making if this one starts to win. Smiley

The bonus point rules were tweaked a couple years ago so that they are only added once. Back when they were added to each flight it made a big difference.

This model is more for cool factor than anything else, and I feel like it has achieved that goal in spades. I've got many other jet cat models that fly far better, and I don't have nearly as much fun flying them. Ironically, they were all harder to trim, too.  Undecided
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dslusarc
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« Reply #680 on: August 08, 2018, 12:05:52 PM »

Josh,

How big is that one in your video? Span, length, aporox weight?

Don
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Maxout
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« Reply #681 on: August 08, 2018, 02:24:35 PM »

Its an 8" span, roughly 20" long. Didn't weigh it, but maybe 7-8g? Not flying outdoor competition actively is really liberating about not having to weigh things.  Grin Grin Grin
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VictorY
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« Reply #682 on: August 09, 2018, 08:27:06 AM »

Would missle carrier tubes add more points? LOL
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dslusarc
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« Reply #683 on: August 09, 2018, 09:48:58 AM »

Its an 8" span, roughly 20" long. Didn't weigh it, but maybe 7-8g? Not flying outdoor competition actively is really liberating about not having to weigh things.  Grin Grin Grin

Thanks. Was thinking of one for next year's Indoor contest in Michigan. My FAC rule comment was more along the lines of it not being considered an "airplane" in the sense that it was never meant to fly out of ground effect.
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Maxout
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« Reply #684 on: August 13, 2018, 01:00:10 PM »

Thanks. Was thinking of one for next year's Indoor contest in Michigan. My FAC rule comment was more along the lines of it not being considered an "airplane" in the sense that it was never meant to fly out of ground effect.

A valid point, but something that could be defeated with any honest CD. The aircraft had greater than a .25:1 thrust:weight ratio at max load, so it would fairly easily fly out of ground effect, and indeed there have been comments made that the pilots had a great deal of trouble keeping the aircraft at optimal altitude--it wanted to FLY!

Also most of the Russian Ekranoplans demonstrated OGE (out of ground effect) flight, it's just that they weren't optimal in that flight regime.
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MKelly
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« Reply #685 on: December 10, 2018, 06:24:00 PM »

Been playing with the Bill Dean Jetex Skyray as a catapult glider.  The plan has a lot of reflex at the trailing edge boat-tail area, which made the model loop spectacularly at launch.  My son loved it, but the loops did nothing for flight duration.  Over several flying sessions I carved and shimmed out pretty much all of the reflex, which let me get rid of a chunk of lead in the front end and pretty much cured the looping.  Flight times have gone from 8-10 seconds to 15-20 seconds, with occasional longer flights from good launches or good air.  It'll never be a world-beater, but it's a lot of fun!

Video from today at:

https://www.youtube.com/watch?v=YXf-P1z-s4U&feature=youtu.be

Mike
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FLYACE1946
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« Reply #686 on: December 10, 2018, 08:13:05 PM »

The flying session was the best and even with my Skyray vastly improved too. A REAL HOOT. Very happy with the results. Just wish the ME-262 was as much fun but still trying.
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OZPAF
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« Reply #687 on: December 11, 2018, 12:27:24 AM »

What a well finished Catjet!. That's good going I would think from a small delta wing model.

John
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Stuondrums
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« Reply #688 on: December 11, 2018, 01:58:36 PM »

Hi folks, noob to the forum here. Some amazingly well flying models! Really good work folks - I am going to have to have a go myself again now.
A few years ago I had a (very brief) attempt at an EE Lightning - about six inches span with almost scale  anhedral. The thing insisted on flying inverted so I went back to flying my RC mustang ( I was on holiday ) I am going to have another go at that, possibly enlarged a little with a flat wing and see what happens. After seeing some of this really cool stuff I may even treat it moderately seriously and try a cambered wing.
On a related but side issue, back when I was a kid in the UK ( Oxford) in about 1972 the local model shop ( Oxford Model Centre in St Giles' ) sold small, injection moulded plastic catapult launched EE lightnings that flew spectacularly well, anyone remember anything like that?
Also, at about the same time there was a fairly advanced for its time mag/comic aimed at the younger reader called Speed and Power. 12p a week and you got loads of articles about things that were, er, fast and powerful. (And an Arthur C Clarke story every week) it had a section called Model spot thta was largely concerned with encouraging and stimulating creativity: scratch building from plans they provided you got a pretty good result from their instructions for an XB70, an F16 ( built with a mix of balsa and cartridge paper, though you could use all balsa I guess ) and a superb set of F111s with various different levels of wing sweep from 1/16 balsa, designed very much like Bill Dean's Skyray - with a fair bit of reflex. They would do quite magnificent loops on launch and fly with varying degrees of speed or duration depending on which of the three you had built.
These of course are nowhere near as scientifically approached as what's going on here - especially from Tross, Maxout and Mike, but fun nevertheless.

Right then, Lightning F6 and a Swift next, I think. And possibly even seeing if I can copy that 262...

Cheers folks.
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