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Author Topic: Went flying.  (Read 217838 times)
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PB_guy
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« Reply #1475 on: December 02, 2020, 12:25:15 PM »

Impressive! Great work!  Smiley
ian
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Kevin M
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« Reply #1476 on: December 02, 2020, 01:39:21 PM »

That's great bobson! Looking forward to seeing the dime/peanut version.

First day out off lockdown here, and managed to get out flying on a small-field site with a friend with the aim of trimming a couple of lockdown models. The weather in southern England was cool and damp with leaden skies but barely a breath of wind, so decent trimming weather. We got both models flying nicely by the time the cold had seeped through to our bones.

The first four pictures are my Deuce, the next two my friend's Knave. He also flew a Mercury Swan off a light bungee, it had a beautiful slow, flat glide, but I failed to get any photos of it.
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rgroener
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« Reply #1477 on: December 25, 2020, 02:16:32 PM »

Great and crisp pictures. They seem to fly very well.
Never heard of the Deuce and Knave, but I like them.
Many good flights!

Roman
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OZPAF
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« Reply #1478 on: December 25, 2020, 07:44:56 PM »

What an unusual model Bobson - impressive flight.

I agree with Roman - beautiful pics of well built models Kevin. Not a professional photographer by any chance?

Cheers,
John
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tross
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« Reply #1479 on: January 03, 2021, 01:04:57 PM »

Really just a chance to wish everyone here a Happy New Year.
This is a short video of the recent U2 glider project.
I have some longer flights recorded, but only included one 30 second clip.
Can be viewed in 1080P.
https://youtu.be/9717nLRgK2Q

Happy New Year.

tross
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Kevin M
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« Reply #1480 on: January 03, 2021, 01:43:54 PM »

Nicely done video cross, it certainly flies well-too well on that occasion.

Roman and John, apologies for not having noticed your comments on my photos earlier, but your compliments are much appreciated. No, very far from being a professional, but I am keen on wildlife photography, and the lenses have also been useful for models (and action pictures for my cricket club).
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OZPAF
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« Reply #1481 on: January 03, 2021, 06:54:53 PM »

Tony you have another winner in the U2. Happy New Year to you as well.

I was about to say that your model has a high camber wing but actually it looks that way as it is so thin. It seems to be strong enough though and it certainly helps the glide which is impressive.

Cheers

John
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OZPAF
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« Reply #1482 on: January 03, 2021, 06:56:07 PM »

Well Kevin you make good use of the equipment - thanks.

Happy New Year

John
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tross
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« Reply #1483 on: January 04, 2021, 06:58:53 PM »

Thank you Kevin,it's always the trees. Tongue

Cheers John. The glide is very close.
Just need some better weather and another glider.
The curve stiffens the thin wing up enough. Might be able to go a little bigger.
2.9% at the root good eye. Cool


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"........
OZPAF
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« Reply #1484 on: January 04, 2021, 08:00:32 PM »

Well I think your glide is only threatened by your friendly trees Cheesy

Happy New Year

John
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tross
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« Reply #1485 on: January 10, 2021, 09:54:09 AM »

Yesterday was a cold (35°F), breezy day for flying.
However, with so many here on HPA restricted from getting out to fly at all  Angry there were no complaints.

The U2 glider finally fell out of the friendly tree after a couple of days John, and
the stab was trimmed further to 80% of scale area.

Stepping inside to warm the hands after rounds of 10 flights or so, the model was handling very well.
Toward the end of the session the rotation timing became consistent with a more vertical launch angle.

Launch height is better than expected and the glide is smooth.
Some flights.   Shocked
https://youtu.be/nGxd0352ZEY

I hope everyone is well.

Tony
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MKelly
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« Reply #1486 on: January 10, 2021, 01:20:35 PM »

Very impressive Tony!

Mike
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tross
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« Reply #1487 on: January 10, 2021, 08:03:50 PM »

Thanks Mike.
In person it behaves a little like the Vampire if you recall that one.
Tony
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OZPAF
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« Reply #1488 on: January 10, 2021, 11:42:43 PM »

You are going to need a DT on that Tony. This must be the best flying Jetcat I have seen flying. Realy nice climb and transition but that floating glide is something else. your thin cambered wing works very well.

John
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Walt
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« Reply #1489 on: January 10, 2021, 11:49:19 PM »

Tony- great video of the U-2.  Really good flights especially considering how overcast it looks.
I was wondering what you saw in the flight pattern that made you decide to cut the stab area back?
Thanks for posting.
Wally
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Jasco
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« Reply #1490 on: January 11, 2021, 10:47:17 AM »

The cata-jet I'm "developing" goes the opposite way...I am using a thicker airfoil and a subject with a short tail moment.  I feel confident the U-2 will outperform it!
I'm getting 16-second flights so far.  Sad
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tross
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« Reply #1491 on: January 11, 2021, 07:11:29 PM »

Cheers John. Either a D/T or a tracker. Shocked Shocked Roll Eyes
Maybe I should reach out to Tapio?
The climb was a surprise for a big glider.

That's where it all starts Jasco no worries.
It's all good. Smiley

Walt.
Email sent.

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"........
Jasco
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« Reply #1492 on: January 12, 2021, 04:19:59 PM »

I took the Temco Pinto I've been working on for some quick test flights at lunch today. My first flights "weren't great" last week as a result of unintentional positive incidence in the H. stabilizer which forced me to add tail weight, with a predictable loss of longitudinal stability. (my stab is non-adjustable)

Today, I tested the plane after putting 1.1 degrees of NEGATIVE incidence in the stab. Naturally, I had to take weight off the tail and add some to the nose.  Longitudinal stability was much better, but now it seems "zoomy" and the glide looks like the plane is too heavy.  The transition at the top of the launch was a thing of beauty, though. It hit the top of the loop upside down and gently rolled to the right as it started it's downhill ride. It didn't want to turn very well and with a 5-6 mph wind, it blew downrange pretty quick but always stayed under control.

I mentioned I used 1.1 degrees...very precise, but how accurate? I discovered measurements I was taking from the plane reconciled nicely with the calculations I was doing on the trigonometry calculator.  I was surprised I was able to be that accurate with balsa and sandpaper. Next I think I'll take all incidence out of the stab for the 0-0 decalage that worked so well on my other designs. That should allow me to reduce the nose weight and therefore the overall weight.

Tony, you mentioned you reduced the size of the stab on your U2...What flight characteristic are you addressing?  I "feel" like I need to do the same thing to the Pinto. I think that might let it find it's best glide speed a little easier?

No videos because the thing won't stay in the air long enough for me to fumble with either my phone or my new Christmas camera. Angry
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OZPAF
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« Reply #1493 on: January 12, 2021, 06:20:56 PM »

Starting at 0 - 0 is the easiest way to success I feel. The final decalage is so small that it is easier to arrive at by trial and error.

Just as an example my 12"CLG has a small stab of around 13.4% of the wing and I only add up elevator to the outside 1/3rd of one half (1/6th of stab span) - warping it up at the most - 1/32".

Roughly then the equivalent move of the whole stab would be approx. 1/32 divided by  6 = 0.005" approx. The stab MAC or average chord is 0.48". Thus using tan = 0.005/0.48 = 0.0104 which gives an angle of 0.6 deg approx.

Just another reason why I like warping as well as it is much easier to move a small section of the stab through 0.063" then the whole stab through 0.005".

Good luck.

John
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tross
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« Reply #1494 on: January 12, 2021, 09:03:46 PM »

Oh you'll know when you have a systemic issue Jasco the model won't be able to get comfortable.
It will either have a good launch or good glide but not both.
You'll be all around it but never get there.

I'm designing in 0.2° of longitudinal dihedral decalage to start and am confident I'm flying with very little.
John is spot on how small the adjustments are.
The launch arc is a dead give away for the stab trim.
Once that is set for the launch I'm trimming around it.

I'm glad you were able to get out at lunch.
That's a great idea. Smiley

Tony
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Indoorflyer
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« Reply #1495 on: January 13, 2021, 01:24:04 PM »

Oh you'll know when you have a systemic issue Jasco the model won't be able to get comfortable.
It will either have a good launch or good glide but not both.

The "Budd Kicker" (really just a gurney strip on the stab TE underside) supposedly  allows a greater decalage (with a more forward CG) to help with the glide, but keeps the plane from going "loopy" on the launch...
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TheLurker
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« Reply #1496 on: January 18, 2021, 04:09:35 PM »

Going a bit doolally here so dusted off the Scraps I built during Incarceration No. 1, gave it a 7" motor made from 3 laccy bands and decamped to the Great Hall*.  Utterly unremarkable flights (typically about 6s on 100 or so turns), but it was sooo good to be flying something, anything.



*The bedroom.  No, there won't be any pictures.  Smiley
« Last Edit: January 18, 2021, 04:44:41 PM by TheLurker » Logged
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