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Old Dec 05, 2012, 06:52 AM
decones is offline
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making my own planes...
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Hi Spencer,
there is no play or lateral slope on this, I use 2 screws (2mm side by side) to keep the stab attached to the fuse cot, this 2 screws pass through 5mm solid carbon rod and attach to nuts in the fuse, the carbon rod do the "pivot" thing, I use some plywood as support to create the pivot hinge moviment.... Here is some pictures that helps to understand...
This is standart stratair building... I just copied them

André
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Old Dec 05, 2012, 10:09 AM
Jantar2A is online now
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From the Rawketenwurm's I have flown on the darkside I would reduce the cord of the flaps for flying at high speeds at Weldon. Looking forward to seeing it fly there.

Nick
Old Dec 05, 2012, 10:12 AM
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Quote:
Originally Posted by Jantar2A View Post
From the Rawketenwurm's I have flown on the darkside I would reduce the cord of the flaps for flying at high speeds at Weldon. Looking forward to seeing it fly there.

Nick
What's the idea on reducing flap size?
avoid command flutter?

I'll run all the linkage on the wing bottom with huuuuge carbon horn
ordered 5 Hitec HS 7115 servos for my heavy wurm according to Joe suggestion,
it seems to be a good HV servo and it's cheaper than MKS
the light wurm will have standart Hyperion servos
Last edited by decones; Dec 05, 2012 at 10:18 AM.
Old Dec 05, 2012, 10:35 AM
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I was only using airtronics 761's on the flaps with tall carbon horns and mine would flutter in the low 200's you may have better luck than me with the servos you are using but if I were to build one for ultimate speed I would still reduce the flap cord lenth especially for weldon that has the easiest landing zone.
Old Dec 06, 2012, 12:06 PM
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Thanks for the explanation Andre. It looks like a good solution!

The 7115th servos are great! I put them in a light K2m and like them alot so far. I would consider adding an external bearing if you want to go really fast as bearing play or flex appears to be their only limitation that might allow flutter. No flaw with the servo, I just think any servo that small could benefit from the external bearing...
Old Dec 12, 2012, 06:54 AM
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Quote:
Originally Posted by Jantar2A View Post
From the Rawketenwurm's I have flown on the darkside I would reduce the cord of the flaps for flying at high speeds at Weldon. Looking forward to seeing it fly there.

Nick
Hey Nick, your raketenwurm's was the 92"ws version F5F or the 74"ws F5B?

Mine is the F5B 74"ws, it has 17cm root chord with flap size being 4.2cm, so it's 25% of the main chord.... maybe reducinf just a little bit will help a lot, what you think?

Cheers,
André
Old Dec 12, 2012, 08:58 AM
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Mine was the 92" version so it's a different one than yours.
Old Dec 12, 2012, 01:13 PM
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Quote:
Originally Posted by Jantar2A View Post
Mine was the 92" version so it's a different one than yours.
humm.. this give you more flap area and ...maybe....more command flutter possibility...
I played with math comparing the root chrod with flap size on DS planes,
avarage was 23% on the root are flap, my standart wurm2b is 26%, If I reduce the flap size (on the root) from 42mm to 38mm I reach that target....
Old Dec 17, 2012, 09:06 PM
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You can always tape the flaps.
Old Dec 18, 2012, 02:52 PM
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Your layup will be so much stiffer than a a standard one that I dont think it will be an issue. Are you going bottom drive on the flaps?, that will help
Old Dec 18, 2012, 03:02 PM
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That's correct Josh, bottom drive big horns on flaps, Hitec 7115 all around, maybe will use those ext bearings to make them more solid linkage, I notice you don't use on your Scorcher.
Old Dec 18, 2012, 03:09 PM
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Hey Andre, I used them on the flaps , and they seem great. I didnt think I'd have enough room on the ailerons but it turns out they would have fit. By the time I realized it was too late. I also could have used a smaller horn on the mks 6125 servos but I was afraid I wouldnt get the aileron travel I needed, which turned out to be a non issue. Now I know that it will fit I will use the frames next time, as there was a little slop in the ailerons that wouldnt be there with the frames. To use the frames I would have to cut one of the mounts off the frame to fit it in the wing, but the frame and servo are all glued in as one anyway so it wouldnt matter.
Old Dec 23, 2012, 05:55 PM
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I ended up opening my xmas present a lttle early this year,
first rocket almost ready for launching, it's a triple carbon wing and a solid fuse,
dry weight 1370g, wing weight 1120g (with 80g on each tip).
This is my light wurm so I would be happy having it just around 2kg.
Flaps and ailerons normal size, no mod, will work hard on this linkage to have it safe and slop free...
next year I start the 3-4kg wurm..
Marry Xmas!!!

André
Old Dec 23, 2012, 06:00 PM
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608 km/h!
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Oooh la la!
Old Dec 23, 2012, 08:39 PM
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Oooh la la!
+1 Very nice.


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