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Author Topic: My own design A6  (Read 2783 times)
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_shadow_
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« on: December 12, 2012, 11:50:43 AM »

Started on the A6 build which I was putting off for a long time.

This is my own design following the A6 rules plans will be drawn if the model is successfully flown. Here are the finished Wing and Stab, next is to set the dihedrals for the Wing at 30 degs. and 60 degs. for the Stab. I'm taking measurements of weight for each wood used, will publish them at the end of the build.

Projected Wing span : 12", flat 12.5", 30* dihedral.
Projected Stab span : 8.5", 10" flat, 60* dihedral.
Wing : 0.449g (bones, 0.180g)
Stab : 0.247g (bones, 0.119g)

I'm using condensor paper from A2Z which was advertised at 600mg/100 sq. in, but in reality it's closer about 850mg/100sq.in as it added 269g after covering the flat area of 31.25 sq.in, about the same for the stab as well...really disappointed! Undecided

I don't think I can make 1.2g with this covering, maybe between 1.4-1.5g.

Motor Stick and Boom to be made next.

Regards
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_shadow_
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« Reply #1 on: December 12, 2012, 08:58:20 PM »

Anyone knows where can I get C-paper between 500mg/100sq.in?

Thanks in advance.

Regards
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Dave Andreski
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« Reply #2 on: December 13, 2012, 07:10:35 AM »

Mike Woodhouse advertises some @ 7.8gms per sq. metre. That should be about 500mg/100sq.in.
I don not own any.
Dave
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« Reply #3 on: December 13, 2012, 09:55:06 AM »

Dave,

Thanks for the info, I'll look it up.

Regards
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« Reply #4 on: December 13, 2012, 11:53:27 AM »

Here is the Motorstick and Boom, both came in at 334mg as is now, will be adding tissue reinforcement to the prop bearing and wing post, so that will add a bit.

I'm actually incorporating some ideas/improvements as read on HPA and the SFA's A6 cookup posts, I'm sure you guys can spot them!

Regards
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« Reply #5 on: December 14, 2012, 01:33:49 PM »

Parts....weight is at 1.181g, will be doing some 'tweaking' to save a bit more.

Regards
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« Reply #6 on: December 19, 2012, 10:28:02 AM »

Here is the A6 and it's 1.490g.

Will rebuild a new wing/stab once I get lighter C-paper, could possibly bring the weight down to 1.300g.

Regards
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Olbill
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« Reply #7 on: December 19, 2012, 01:15:34 PM »

Shortening the wing posts would remove a lot of weight.
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« Reply #8 on: December 19, 2012, 07:45:41 PM »

Olbill,

Thanks of the input, that's exactly what my flying buddy, hklam told me too.

I'll make the change as I go along, some other changes include different profile prop blade, slimmer MS, shorter boom. I'm looking forward to track progress (is any) with the changes that are made, it will teach me something, i hope!

We fly in a CAT II site, don't know what to expect in terms of duration, I'll keep HPA posted.

Thanks again.

Regards
« Last Edit: December 19, 2012, 08:05:18 PM by _shadow_ » Logged
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« Reply #9 on: January 05, 2013, 03:14:53 PM »

Some progress with the A6.

Motor : 0.035", 11" loop
Winds : 2000 (no back off)
Flight Duration : 4m43s
Lauch Torque : 0.19 in/oz
Height : Approximately 40'
Circle Diameter : Approximately 15-20'

It landed with without any turns left....this was it's proper flight, all other earlier flight had some trimming issues. I had to reset the warps on the wing/stab to 0, thrust is now 0,0. It has some stab tilt and decalage, have not measured how much yet.

Lots of room for improvement...next

Regards
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Olbill
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« Reply #10 on: January 05, 2013, 04:49:24 PM »

I started to write that your motor was way too small until I noticed that it used all the turns. I'm not sure what to think about that.

FWIW I used a 20" 1.2g motor for the Cat 2 record flight of 7:26. Other data:
3780 turns in
Max torque .30 in-oz
Backoff 620 turns
Launch torque .096 in-oz
Turns remaining 380
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« Reply #11 on: January 06, 2013, 01:46:39 AM »

Thanks for that data.

The motor was fully unwound just as it was landing, I was paying attention to it..my next move is to find out the breaking point of the 035 rubber and make a 15" motor of the same size to see where it goes.

Regards
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« Reply #12 on: August 31, 2013, 11:33:46 PM »

I'm back flying the A6 recently, there is small postal contest going on between Malaysia and Thailand. Since then I have had to rebuild a new wing and tails since the older one was all warped after sitting in its box for a few months.

Made a flaring prop with bamboo spar a few days back and here are the results.

A6 Weight : 1.65g
Motor : 1.4g 23" loop
Max Winds : 3600
Max Torque : was not paying to much attention, somewhere around 0.3++ I think!
Back off : 180
Launch Torque : 0.155
Max Height : about 50'...there a bit more room to climb, maybe 5-10'
Timing : 5m16s - best flight of the day, timings were pretty consistent between 5m10s - 5m16s.
Winds left : 350

Some more testing next week and need to start recording data properly.

Regards

PS : with the above flight data and performance, I think there might be something wrong with the data in post #9.
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« Last Edit: September 01, 2013, 12:03:06 AM by _shadow_ » Logged
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« Reply #13 on: September 18, 2013, 01:06:05 PM »

New weight after extensive surgery 1.218g.


Regards
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Olbill
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« Reply #14 on: September 18, 2013, 02:51:13 PM »

Taking off almost 1/2 gram of weight should make a huge difference in performance!
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« Reply #15 on: September 20, 2013, 02:50:29 PM »

Update...best time as of now 5m49s, here are some data.

Motor size : 1.078g, 21" loop, Tan Super Sport
Max Winds : 3901
Max Torque : 0.334 oz-in
Backoff : 156
Launch Torque : 0.205 oz-in
Timing : 5m49s, could not determine unused winds as the motor was about to break, maybe about 500-600.

This time the model climbed maybe within 5-10ft of the ceiling..will be adjusting decalage to get a bit more out.
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« Reply #16 on: August 19, 2017, 01:45:38 AM »

Hi guys,

Back flying the A6, here is a video of it flying after many years.

https://youtu.be/4BN5RZNThsY

Motor is 0.040", 1.09g, 21" loop.

What does can do to slow it down? Seems like its fly too fast.

Thanks in advance.

Regards

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Olbill
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« Reply #17 on: August 19, 2017, 10:22:16 AM »

Most A-6's with small stabs (50% or less) fly pretty fast. Mine flies a lot slower because of my large stab. The flying speed is pretty much determined by the weight of the model and the size of the lifting surfaces. There's not much you can do to change the flying speed without changing one of those parameters.
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adanjo
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« Reply #18 on: August 19, 2017, 01:10:56 PM »


What does can do to slow it down? Seems like its fly too fast.


Watched the video and felt it was not fast at all.
I have done some 8 mins+ flights with 50% stab model at cat2 (about 12meters) gym and the rubber data of one of 8mins flights is :

Tan2, 1.00 g/m x 394mm loop, wound 3100, back-off 70, Tq 13gcm, remain 221, time 8:10
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« Reply #19 on: August 22, 2017, 09:50:01 AM »

Gents,

Thanks for your valuable inputs.

Regards
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