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Author Topic: CATAJETS: Design and Development  (Read 37161 times)
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FAAMAN
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Even bumble bees can fly !!!!



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« Reply #550 on: April 28, 2017, 06:02:34 PM »

Yahoo MK Cool Cool Cool
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MKelly
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« Reply #551 on: April 29, 2017, 01:36:48 PM »

Took the Scimitar out this morning to our normal flying site.  Only got in two launches in 10+ MPH winds.  First one had good height but looped over the top.  Banked it a little more right for the second launch, got a great climbing turn with nice rollout on the top, flew the entire length of our flying field downwind, turned west and ended up between fences at the field boundary.  Handled the wind very well.  Retrieved it intact and decided to declare victory and save the model for calmer days or bigger fields.  This one is a screamer!
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FLYACE1946
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« Reply #552 on: April 29, 2017, 06:37:21 PM »

It was a real thrill to witness the two flights. It really did well, got us both scared and I think the flock of birds noticed it too.

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FAAMAN
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« Reply #553 on: April 29, 2017, 06:58:36 PM »

Outstanding!! Cool Cool Any photos? Wink
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FLYACE1946
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« Reply #554 on: April 29, 2017, 07:15:25 PM »

Not yet but hope to get an action video asap.
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Coops
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« Reply #555 on: April 30, 2017, 06:22:54 PM »

Spent this evening assembling the Aero L-39 Albatross I'd been planning for a while although I've still got some final sanding to do. I had no printed plan for this one, just re-sized sections of a three view in GIMP for the templates for stab, fin, and fuze. The wings were just eyeballed based on what looked about right. 10" wing span, 3/4" dihedral under each tip. 1/16" sheet all around, the fuze is laminated to 1/8", 1/4" in the width where the intakes are.

http://img.photobucket.com/albums/v108/Coopdevil/aero1_zpswt0kzij8.jpg

http://img.photobucket.com/albums/v108/Coopdevil/aero2_zpsx7aktcrl.jpg

http://img.photobucket.com/albums/v108/Coopdevil/aero3_zpsvxfbfldu.jpg

http://img.photobucket.com/albums/v108/Coopdevil/aero4_zpsfttcbalx.jpg

I've made life easy for myself by copying a couple of the Reno air racers which gives me the excuse to leave off the fiddly wingtip tanks.

http://img.photobucket.com/albums/v108/Coopdevil/66_L-39_Albatros_VH_IJC_True_Blue_Reno_Air_Races_2014_photo_D_Ramey_Logan_zpsnpwh9msz.jpg

http://img.photobucket.com/albums/v108/Coopdevil/25_plane_Violated-1024x727_zpshlyau0zv.jpg

It's a great feeling when you start sanding and feel it taking shape and becoming smoother and smoother under the fingertips isn't it? I'd never really done any woodworking before getting interested in gliders and now I understand how therapeutic it can be. I actually enjoying the sanding whereas previously when I've needed to do some for household DIY it's a just a chore!

Coop
CATAJETS: Design and Development
CATAJETS: Design and Development
CATAJETS: Design and Development
CATAJETS: Design and Development
CATAJETS: Design and Development
CATAJETS: Design and Development
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MKelly
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« Reply #556 on: April 30, 2017, 09:50:31 PM »

Good-looking jet, Coop!  Let us know how she flies.

Cheers,

Mike
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MKelly
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« Reply #557 on: May 05, 2017, 04:37:25 PM »

Finally had a free day with some good weather to try out the Scimitar.  It flies nicely - big barrel roll on launch, fast flat glide down.  You've got to keep your eyes on it or you'll lose it.  Tricky to get max height on the launch, not enough bank or too much angle up and it loops over the top, loosing hard-won altitude.  Best timed flight of the day was just over 25 seconds, most flights were 15-25 seconds.  Should be able to wring a little more out of it as launch technique improves.

The swallows at the field get quite concerned when the Scimitar is in the air - video at:

https://www.youtube.com/watch?v=SSCXqGVAqog

The Scimitar is just a dot in the videos - you can find it by following the swallows...

Thanks to Allen Shields for taking the vids.

Cheers,

Mike
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FAAMAN
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« Reply #558 on: May 05, 2017, 07:18:01 PM »

OUTSTANDING!!!! Cool Cool Cool Cool
Congrats on the Scimitar Wink Wink
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Sky9pilot
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« Reply #559 on: May 05, 2017, 09:42:12 PM »

Ditto what FAAMAN said....she's a beauty!
Tom
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Dimeflyer
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« Reply #560 on: May 06, 2017, 05:03:21 PM »

I like your work and congrats on a great plane !
George
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MKelly
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« Reply #561 on: May 07, 2017, 09:24:28 AM »

Thanks!  This has been a neat little exercise.  Doing this plane again (which I probably will) I'd enlarge the stab a little less (current model is 175% to get a tail volume of .65) and put a lighter finish on it (paint and markings added 2 grams on a 10-gram model).  Sanding washout into the wings combined with the sweepback provides more than enough stability to get away with a flat wing (no dihedral).  The catapult hook needs to be just a bit longer, and the bottom of the hook needs to be rounded off - I've cut the rubber on both my 3/16" and 1/4" launchers flying this plane.

The good on this is that it climbs out better than any jet-cat I've seen, and although very fast it glides flat enough to get reasonable duration.  It also flies very well in the wind, although you've got to keep a close eye on it as it goes far downwind very quickly.

I didn't test fly it without the wing fences, so I don't know if they had any real effect good or bad on flights.

There are more of these low-aspect-ratio jet cats in my future...

Cheers,

Mike
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FLYACE1946
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« Reply #562 on: May 08, 2017, 10:11:35 AM »

Another way to make them lighter is by cutting some of the balsa from the wing and then replacing the missing wood with good quality tissue. Some success with that knife is always nice. This suggestion is for your future jets. Not the Scimitar.
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Coops
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« Reply #563 on: May 09, 2017, 02:59:26 PM »

I discovered this little microjet today - the SubSonex JSX-2, all 18' wing span of it and immediately thought "Catajet". Following by thinking "err... I'm fairly certain I've run out of 1/16" balsa sheet..."

Nice parallel TE and LE on the wing so easy to cut out, and high visibility bright yellow colouring.

http://img.photobucket.com/albums/v108/Coopdevil/JSX-2_3-view_zpstvmmhssb.jpg

http://img.photobucket.com/albums/v108/Coopdevil/SubSonex_N241SJ_First_Flight_2330x_zpsbq4gcdp2.jpg

http://img.photobucket.com/albums/v108/Coopdevil/SubSonex_air-to-air_8382x_zpswzfif2q7.jpg

http://img.photobucket.com/albums/v108/Coopdevil/SubSonex_1870%201_zpsyftbxkvi.jpg

Sonex are so helpful to aeromodellers, they even add a diagram in their brochure to tell you how much of the pilot should be visible...

http://img.photobucket.com/albums/v108/Coopdevil/3_zpsqrmuz07v.jpg

I tried to attach the small brochure here (1.65MB) but apparently we can't attach PDF so here's the link instead

http://www.sonexaircraft.com/subsonex/SubSonex_Brochure_032816-web-optimized.pdf

A certain future project here.

Coop
CATAJETS: Design and Development
CATAJETS: Design and Development
CATAJETS: Design and Development
CATAJETS: Design and Development
CATAJETS: Design and Development
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MKelly
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« Reply #564 on: May 13, 2017, 05:24:48 PM »

Sonex looks interesting, Coop - build it!

Did some jetcat flying today with my family - son had a ball with the Skyray.  He did learn the hard way to keep his right arm away from the body while launching - I'd warned him but he got distracted while mom was videoing a launch and got a nice scrape across his right cheek.  After a few moments he was back to launching again.

I flew the Scimitar some more today - early morning flights went very well, but when I came back to the Scimitar a couple of hours later it wanted to launch high then spiral in.  Not sure what changed, managed to get it back to a decent glide but performance remained kinda unpredictable.  Still thinking this through...

Cheers,

Mike

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OZPAF
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« Reply #565 on: May 13, 2017, 06:23:38 PM »

If it was a warm day( certainly looks warm ) it may have developed a slight warp in the wing or tail.
It looks like you and your son had fun anyway.

John
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FAAMAN
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« Reply #566 on: May 13, 2017, 07:43:29 PM »

Great pics!!
Agree with OZPAF wing warp from the hot day could cause the unstable flying characteristics,
Light winds mate Wink
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MKelly
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« Reply #567 on: May 13, 2017, 11:11:05 PM »

Thanks!  Agree on the warp - the Scimitar had been sitting in the sun and it looked like the right wing had lost a bit of washout.

Mike
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« Reply #568 on: June 28, 2017, 09:20:45 AM »

my latest JetCat

http://volareproducts.com/wp-content/uploads/OhkaProcess17.jpg

--george
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« Reply #569 on: June 28, 2017, 09:24:22 AM »

my latest JetCat

http://volareproducts.com/wp-content/uploads/OhkaProcess17.jpg

--george
You will LIKE it!
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« Reply #570 on: July 03, 2017, 07:53:33 PM »

Here's my little Brit fighter sold to the Swiss. Flies pretty well. I have made several mods and it is doing very well.
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FAAMAN
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« Reply #571 on: July 04, 2017, 12:15:24 AM »

That's a very nice Vampire Wink
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dohrmc
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« Reply #572 on: July 06, 2017, 10:12:56 PM »

Thank you. It is a nice kit from Retro RC. Laser cut, everything fits. Highly recommended, as it has a good glide.

It's most likely too heavy to be a winnah, so I am using it to learn to get it as high as possible on launch and then have a decent transition. I'm close, but no cigar yet! Still, it will reliably do 20 seconds +\- a couple, so with some tweaks, it should do ok for our local contests.

I have never paid much attention to this event, but now am going to put a little more focus on it.
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