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Author Topic: CATAJETS: Design and Development  (Read 50110 times)
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MKelly
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« Reply #650 on: July 03, 2018, 04:57:16 PM »

At 16g your Schwalbe should fly quite nicely!  Mine weighs about 25g.  To give credit where it's due, the short kit I built from was designed by Henry Toews and "productionized" for laser cutting by IronMike.  I fiddled with the wing rib configuration and beefed up the nacelles (thus the somewhat portly flying weight).

Look forward to your flight reports Paul.

Mike
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tross
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« Reply #651 on: July 05, 2018, 01:19:53 PM »

It looks like a flier Maxout, the stab doesn't look big.
Glad to hear you have a laser cutter now, it will no doubt speed things up. Smiley

That's a nice looking cat jet Paul, they should give you plenty of extra points. Cheesy
Your wing design is just standard stick and tissue?
Very cool.

Hi John yes. I fly them straight at the trees until they get bored and give up. Cool

The first few iterations of the SR-71 flew fine as long as there was a breeze.
Trimming in calm conditions highlighted it's inability to self correct in pitch.
I made a couple of voodoo modifications, but was just putting off the inevitable.

The new model is bigger, and with an 8" span it's nearly 16" long. Shocked Shocked
There's a slight rise in elevation or climb out at high speed.
The transition is smooth and the glide is very stable.
It's a slower glide now for obvious reasons (see pic).
But as the nose lowers the on-coming wind encounters the smaller outboard elevons and we see a nose up correction.
If the nose starts to rise in the glide and then starts to slow, the on-coming wind is deflected by the larger inboard elevons.
The degree of launch bunt/loop is a balance of the four elevons as a whole.
The outboard elevons control the roll at high speed effectively, and can turn the model in the glide with a neutral rudder.
Tilting the model over at launch with a half pull of 1/8" rubber, the model rolls out at 40 ft. and heads straight for the corn.
Turning in the glide eats duration as expected.
Very little ballast is required.
Weight for this larger version is 6.8 grams.
The weather looks nice for the weekend, so I may stop down at the school to let it loose. Grin

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"........
MKelly
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« Reply #652 on: July 05, 2018, 01:36:29 PM »

Very cool Tony.  If you get a chance to stretch it out at the schoolyard please take video!

Mike
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tross
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« Reply #653 on: July 05, 2018, 10:37:15 PM »

Hi Mike thanks.
Of course. Always taking some video if possible. Grin
I'm still a little hesitant to let it rip completely.
Just trying to stay out of the corn. Roll Eyes

https://youtu.be/Zvn4mSZfPlI

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"........
tross
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« Reply #654 on: July 07, 2018, 04:10:41 PM »

Those flights are hard to see. Tongue
Here are a couple low launch flights that circle back around (which is nice, less walking). Smiley
This set up would probably work well enough for any type of SR-71 free flight model. Cool

https://youtu.be/-jHW3hKCz9w

May I ask what type of airbrush paint you guys/gals are using for these?
I have a couple of options but would appreciate suggestions.

The slow trim is a little strange for a jet, so I set everything back to zero and trimmed minimums for a faster glide.
It climbs higher and flies faster but the duration is about the same.

https://youtu.be/eWKIFRWDiFs

Cat Jet fliers might get a kick out of this next video.... Grin Smiley Cheesy Grin

https://youtu.be/5DLD8rtTKTM


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"........
LASTWOODSMAN
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« Reply #655 on: July 07, 2018, 04:48:54 PM »

Great videos Tony !    Shocked Shocked   I really enjoyed them.    Now I know what a lawn dart is, in the truest sense of the word .... that SR-71 Blackbird catajet not only finishes like a lawn dart, it actually looks like a "lawn dart" going in.   Smiley

LASTWOODSMAN
Richard
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OH, I HAVE SLIPPED THE SURLY BONDS OF EARTH ... UP, UP THE LONG DELIRIOUS BURNING BLUE ... SUNWARD I'VE CLIMBED AND JOINED THE TUMBLING MIRTH OF SUN-SPLIT CLOUDS ...
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« Reply #656 on: July 08, 2018, 12:39:42 AM »

Fancy treating your $ 1 to the power of - billion balsa SR71 like that Tony. Grin lots of fun for very little money except time.

What would Kelly Johnson say? Cheesy Cheaper than wind tunnel testing.

Thanks for your vids

John
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tross
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« Reply #657 on: July 09, 2018, 08:27:38 AM »

Thanks Richard. Much appreciated. Smiley
I think the next time it darts in I'll just leave it there.
It would make a fitting snow gauge for an aero modeler. Grin Smiley Cheesy Grin

Kelly Johnson would say I'm a nut job John. Roll Eyes
SR-71 and glider in the same sentence just sounds weird.
It's only been about a week and I've found it to be surprising easy to fly.
I made a design change that added 5 seconds (30%) to the average duration.
More of a left turn roll out, less of a loop.

The third launch is the highest.  Shocked
I put an evening calm wind launch in there for the record.
Spent some time on the roof, in the trees, and out in the corn but it was a good day of flying. Grin Grin Grin

https://youtu.be/QD89062aPQE

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"........
Bigbandito
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« Reply #658 on: July 09, 2018, 02:15:03 PM »

Beautiful plane and great flights. I wouldn’t have thought it possible. Thanks for sharing.


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"If you love something, set it free...  Just make sure you've got a DT on it."  - Richard Bach (paraphrased)
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« Reply #659 on: July 09, 2018, 08:34:02 PM »

Well done Tony.

John
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MKelly
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« Reply #660 on: July 09, 2018, 09:00:44 PM »

Very cool Tony, what's next?  XB-70, maybe an Ekranoplan?

You're making me want to do another jetcat.


Mike
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tross
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« Reply #661 on: July 10, 2018, 12:48:53 PM »

Absolutely Mike, you should build another one. Smiley
The Valkyrie would be a neat trick.
Although I'm on the fence a little about dealing with a canard, it might be a plus.

Thanks for the reply Bigbandito. Much appreciated. Smiley
These little planes are something else. Crazy fun. Cheesy

As well for you John. Smiley I see now why this is a thing.
I lost it in the corn last night but it was near retirement.
Part of the deal.

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 #662 on: July 11, 2018, 11:29:19 AM »

It looks like a flier Maxout, the stab doesn't look big.
Glad to hear you have a laser cutter now, it will no doubt speed things up. Smiley

It's turned into a consistent flier. Flights are mostly in the mid 30's when I'm not doing stupid stuff. Even then it usually pops into a nice glide at thermal catching altitude (I normally fly in the evenings so those are rare).
https://www.youtube.com/watch?v=XlxRz9kRsmU&t=2s

I'm enjoying your SR-71 efforts. Would love to make a kit of that bird but Lockheed is really nasty about requiring licensure of these things. Maybe I'll try something silly like an XB-70...
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tross
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« Reply #663 on: July 12, 2018, 12:56:46 PM »

It looks like a fun jet Maxout. Smiley
Very cool and nice paint job (what kind of paint is that BTW  Roll Eyes).

I hope you get some time to draw up, and kit, a delta.  Grin
Unfortunately, I could use a bigger yard... Cheesy

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"........
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