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Author Topic: De Schelde Scheldemeeuw for indoor rubber  (Read 1401 times)
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TheLurker
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« Reply #25 on: September 08, 2019, 03:50:05 AM »

Nice, still odd, but nice.  Smiley
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dputt7
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« Reply #26 on: September 08, 2019, 07:41:18 AM »

Well done, it looks great, quite unique!
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korale
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« Reply #27 on: September 08, 2019, 07:54:09 AM »

Could not get to the stage of getting it all glued up.

Managed to get the transparencies glued in and the tail surfaces hinged and attached to each other, Here is the state at the moment, I also carved a prop The prop need a little more shaping.

Everything pictured weighs 14.5g I'm looking at 16g Finished weight, which is not too bad.   

Wont have much time to build during the week so but will try and get something done.
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OZPAF
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« Reply #28 on: September 09, 2019, 04:15:31 AM »

Wild little beast - it looks functional and strange at the same time. It should fly well if you can get that drive train working.

John
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Pat D
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« Reply #29 on: September 11, 2019, 03:58:58 AM »

cool ! would be a good candidate for a CO2 pusher also

Pat

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korale
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« Reply #30 on: September 11, 2019, 07:36:09 PM »

There is a plan on outerzone.co.uk for a CO2 pusher version.  The tailplane is the wrong shape and some of the proportions are not quite right on that plan.
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dputt7
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« Reply #31 on: September 11, 2019, 11:15:37 PM »

  There was a wheeled version also     https://youtu.be/HYI5g2FYImc
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OZPAF
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« Reply #32 on: September 12, 2019, 07:06:34 AM »

That version has a neat looking nose Dave. It's quite a cute looking aircraft.

John
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korale
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« Reply #33 on: September 14, 2019, 06:17:45 AM »

Glued it all up and attached the structural struts.

Its essentially flight ready now, need to do the non functional struts, dummy engine and tip floats.

15.3g at the moment.
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korale
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« Reply #34 on: September 16, 2019, 04:39:33 AM »

Built the tip floats, carved foam with tissue covering 0.2g apiece.

I'll try to thin the walls of the floats a little more.
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korale
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« Reply #35 on: September 28, 2019, 05:16:04 AM »

Got the motor and prop put in and wound it up,

here is a short video of a motor run , I think I can get easily get a 25 -30 second motor run.


https://www.youtube.com/watch?v=OhJ4miuz_tI 
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OZPAF
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« Reply #36 on: September 28, 2019, 06:24:48 AM »

Interesting to see that despite the angle of the drive - it is running well. Good luck with the trim flights.

John
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korale
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« Reply #37 on: September 28, 2019, 07:31:44 AM »

I used an angled rubber drive on my bostonian seagull and it does work.

Although in that case it was a tractor prop.  

https://www.hippocketaeronautics.com/hpa_forum/index.php?action=dlattach;topic=18545.0;attach=135637;image

https://www.youtube.com/watch?v=BGCQYy3ulVw
https://www.youtube.com/watch?v=zLL3y69GWO8
De Schelde Scheldemeeuw for indoor rubber
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korale
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« Reply #38 on: November 03, 2019, 07:04:55 AM »

https://youtu.be/k5j_1JdIJ_A

got some trimming flights in today, looks very hopeful I just had to add a little noseweight. 
I will finish the scale details before the next flying session and try a little more rubber.
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PB_guy
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« Reply #39 on: November 03, 2019, 09:48:47 AM »

Impressive!
ian
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Andy Blackburn
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« Reply #40 on: November 03, 2019, 11:35:30 AM »

Impressive!
ian

+1. What % max turns?

A.
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TheLurker
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« Reply #41 on: November 03, 2019, 03:56:36 PM »

Impressive!
ian
+1 ditto and I don't care about the turn count cos it was nice to see it flying.
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Pete Fardell
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« Reply #42 on: November 03, 2019, 04:16:12 PM »

Nice models, both, and nice flights too. That angled rubber motor opens up a host of possibilities.
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korale
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« Reply #43 on: November 03, 2019, 05:11:19 PM »

I was using some old rubber and did not have a blast tube so did not wind to the limit. These videos are probably with 60% of the max turns.

The angled rubber drive works OK but it still has some issues. Need to widen the space for the motor a little, it was binding a little and you have to watch the knots on the rubber.

I'd like to see what your mind comes up with Pete.
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korale
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« Reply #44 on: November 15, 2019, 11:29:30 PM »

I have almost finished adding detail to the model.

Added lettering , some additional struts and dummy engine  

I still have that nasty bloom that I could not get rid of.
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korale
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« Reply #45 on: December 18, 2019, 02:23:59 AM »

Took the model flying again, and entered it club scale comp,

not happy with the performance, never got it to climb and the longest it flew for was 14 seconds, not long enough to qualify.

I'm thinking about some modifications. the problem is the small diameter prop and the short hook to peg length, I tried putting in a longer loop but the narrow cabin at the top causes the rubber to bind and the model drops from the sky.
I'll try it with a lower pitch prop but that will only reduce the motor run.

I am thinking about building a slightly larger version (18 inches) that should stop the problem with the motor binding. the other option is to mess around with gears and wire drives, I'm going to try a few things with the current model first before I build a new phone.   
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TheLurker
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« Reply #46 on: December 18, 2019, 02:40:39 AM »

Quote from: korale
...not happy with the performance...
For what is obviously a challenging subject regarding the motor line/length and prop. size that sounds like good result.  I think you should be justifiably proud of having coaxed that much performance out of it. Be very interested to see how a larger version does though.

Lurk.
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OZPAF
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« Reply #47 on: December 18, 2019, 06:44:42 PM »

It's not a bad result considering the complications, especially at that size. Good luck with the enlarged version.

Merry Christmas
John
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