Lumenier RB2205C-12 2400KV SKITZO Ceramic Bearing Motor
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Old Jun 30, 2008, 02:11 AM
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Tearing the Skies a new one...
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I searched and searched for thin servos... Thanks Adam for that tip: I gave up when I failed to find anything thinner than 10mm

I'd much rather have the servos in the wings... Question is whether I'm being a tad pathetic worrying about the drag. I can make the links tiny and waif-like...

Better to have servos in wings than to have to fiddle with linkages each time you put the wings on.. right?

The servo covers can be moulded... and the recesses can be crack/gap-free...

19 bucks a pop for the 47's? that's about 4 quid with today's exchange rates


Sam: I thought about custom torque-rods... but each time you come to it you need to fit it though the faired-in wing-root and then couple it. Hassle.. especially when the components are small, and especially when the emphasis on this thing is to have an easy-to assemble slope toy.... having little linkages seems to negate that goal, and It'd also load the Kevlar hinges in a weird way.

Typing thought processes out loud seems to make these things easier .... I now know where I Stand

20oz/inch comes out at about 1.4kg/cm by my reckoning... That's MORE than enough welly for this puppy.
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Old Jun 30, 2008, 03:05 AM
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icicic. Pluggable wings. No good for torque rods. IMO a good blister will be your friend. Praps some of those Airtronics ones?
Old Jun 30, 2008, 03:37 AM
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Blister? Is that the official word for the aerodynamic fairings?...

Mr Editor and Peter W have both chimed in to say that the D4.7's are too small for this job, and that the D60's would be a better choice.... I'll get on to modelling one to see if it fits
Old Jun 30, 2008, 03:40 AM
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Something as clean as that - it'd be a shame to have servo blisters or control horns out in the air.
Old Jun 30, 2008, 04:26 AM
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You must die! I alone am best.
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Quote:
Originally Posted by Sensiblenick
I searched and searched for thin servos... Thanks Adam for that tip: I gave up when I failed to find anything thinner than 10mm

20oz/inch comes out at about 1.4kg/cm by my reckoning... That's MORE than enough welly for this puppy.
Nick - These servos are seriously very good even though they're distributed by Ripmax!
The resolution is fantastic for an analouge and the speeds not bad on 4.8v.
I was always wary of the servo arms (being thin and skinny) but every linkage needs a weak link right and I've never had one fail at all under any circumstances.
I have used them on my small electric pylon models in the past and they are readily available over here.

Andy

http://www.phoenixmp.com/acatalog/info_SR010.html
http://www.phoenixmp.com/acatalog/info_SR005.html
Old Jun 30, 2008, 04:27 AM
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Tearing the Skies a new one...
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It'd also be a shame to design in a sloppy linkage that needs to be fiddled with each time you slot the wings in...

The surface of the wing would only be interrupted by a very narrow channel for the linkage rod... not to accommodate the body of the servo.... Not all that bad really?

Edit: Slopetrash: Those servos have the exact same stats and shape as the D4.7 and D60 that have been suggested by Adam.... I wonder if they're just re-labelled by each company that sells them?

It is the larger of the two we're now trying to fit in. (and it's about 35% cheaper if bought in the USA)
Last edited by Sensiblenick; Jun 30, 2008 at 04:32 AM.
Old Jun 30, 2008, 05:10 AM
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D47 are not suitable, D60 are close to the perfect servo.

At least that's what most F5D folks found to be true.

We even have sanded D60s to fit the corners into wings.

I would at least try to get an RDS solution builtin, but certainly not on the first prototype.
The Akamodell München, however, has managed to even build Bathlet F5D wings with D47 and RDS fully installed before closing the molds.
Lots of things are possible if you really want it.

biber
Old Jun 30, 2008, 06:45 AM
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Well... Either way: RDS or servo in wing requires a servo hatch... So best to get on with it and whack one in.

D60's.... message received lads.... Thanks
Old Jul 02, 2008, 01:47 PM
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Well, We've nearly got to a shape that I'm happy with on the fus.. and the tail has atleast got a side profile.

I had the settigns low, so the fus looks more angular than it will actually be..

There are a few questions over how to optimise the machining process so that it takes less than 6 hours per mould..

Might start on machining this week some time.

Servos are to be housed near the root with the linkages top-side. Servo bay flanges will countour the wing's surface, and the servo covers will be correctly coutoured to the wing's surface So We'll only be missing lift from the 5mm slice that sheilds the linkages...

It's going to be fun.
Last edited by Sensiblenick; Sep 30, 2008 at 03:56 AM.
Old Jul 02, 2008, 02:13 PM
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Very slick! I like it.

-P
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Old Jul 02, 2008, 07:19 PM
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Will it be a Chuck certified product?
Old Jul 03, 2008, 03:52 AM
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Tearing the Skies a new one...
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D60's it is


Following the advice of many helpful people, I've Just ordered 4 M60's from Dymond ... It'll be interesting to see how punitive the import Tax will be.

Dymond's Price $(USD)20 ~ 120Kronor
Ripmax Price £(GBP)16 ~ 190Kronor

That's a 280Kr Saving on 4 servos.. About 20 quid or 40 Dollars...

I wonder what postage and import tax will be... I'll update later to let you know!
Old Jul 03, 2008, 04:00 AM
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Quote:
Originally Posted by chetosmachine
Will it be a Chuck certified product?
Chuck does not certify products. If they continue to exist it can simply be assumed that they do not offend him.
Old Jul 03, 2008, 05:55 AM
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Quote:
That wavy TE on the fin is not deliberate.. and will be strightened out =)
Pity, I liked it a lot.
Old Jul 03, 2008, 06:09 AM
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Originally Posted by zero-zero
Pity, I liked it a lot.
Anyone else? I'm open to persuasion...


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