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Century Helicopter . MTA Hobbies . MRC/Altech Marketing USA

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CAD - Engineering - Technical > Re-designing a helicopter.
 
 
SkateFreak
Key Veteran
Location: Cambs UK/Luton

Hey,
So I know this is going to com across as pretty far fetched but I have an OS70SXH with an awesome exhaust that’s virtually never seen fuel and i have to do something with it heh.
But the only way to really get good power would be to big block...
I’ve been thinking of buying a second T-rex 600N Sport kit because as I look at my current 600 it doesn’t look like it would be to hard to *tinker* with the design.

I'm contemplating making new frames from some 2mm carbon using the 600 gubbins but have also been thinking about playing with the raptor gears to move the engine in a little closer to the mahin shaft (to make up for the extra weight), removing the front starting from the starter shaft forward (aside the cooling shroud), moving the servos around the main shaft/onto boom/behind motor an up a little heh.
Add another panel to the frame to fit in the TT engine mount one piece for strength and fabricating some undercarriage like the 3DNT which will attach from the engine back (and probably lean the whole heli like the NT because it looks so good I modified my raptor )...
Thinking about the ballaning as long as I can get it relitivly close I can use the radio gear/battery to hone it in

I'm also thinking about getting a bigger tank in there, will be stretching the boom (which i have as well as supports, belt etc).

I'll run the same main shaft with 680'ish blades at first with lower cyclic pitch for now with infinivations, feathering spindle collar and metal blade grips.
When I decide to increase the cyclic pitch I will jst change the lower support to a 10mil bearing and get a taller JR main shaft in there for the clearance from the boom (Unless I invert the tail section bringing the boom lower, which shouldnt be to much of a problem as there will be a forward tilt due to the 3DNT style undercarrige) which in all essance will proberbly make for one hell'a ugly machine heh.

So essentially I guess I'm asking you guys in the *technical* forum just how feasible this is?
I’ve been tinkering with helis for >4yrs now and feel I'm capable of producing a solid (aka safe) modification but I’m in the good habit of always asking around to find out weather I'm likely to encounter any problems I haven’t foreseen

At home I have access to pillar drills, cutting machines etc and my friend has a lathe/mill etc but here I have my trusty dremmel and any hand tools I bring home.

I'm getting so bored I baked bread this afternoon heh.
Therefore all the constructive criticism you can muster would be fantastic

Best regards

-Jvr
11-05-2007 09:53 PM
 
 
Yug
rrProfessor
Location: Niatirb Taerg

This sounds a bit similar to what you wanted to do with your Raptor.
What you do depends on what you wish to achieve from your heli. For the 600N, flybarless is probably the next big improvement. Issues such as rigidity and weight are already supprisingly good (considering how bendy they are prior to assembly) so I doubt using thicker frames would offer a significant advantage.
Bringing the boom lower would have the advantage in a flybarless setup that you could shorten the main shaft and thus raise the CG.
BTW, what's your favorite bread recipe ?

Team Solar Driftwood
11-06-2007 01:37 AM
 
 
Yug
rrProfessor
Location: Niatirb Taerg

Just occurred to me:- wait for the Rex700

Team Solar Driftwood
11-06-2007 01:48 AM
 
 
SkateFreak
Key Veteran
Location: Cambs UK/Luton

Heh,
Well, belive it or not, i'm in uni tomorow from 9am till 5pm with only one short break and therefore I have decided to act upon the urge to bake some banana bread at 2am in the morning whilst finnishing an assignment heh...
And yeah, thats yr answer... banana bread is top dog

But back to the helis...
Well I would wait for the 700 to come out but I would like to get the 600 as light as possible by butchering it heh.
Also, money is a concern as well as my own sanity...
I need something to tinker with down here because theres no way i can fly out here
I recon with enough time to ponder over a kit, fiddle and sive the internet for ideas I might just be able to keep the weight down to something like the 600 with a 50 in it, but with the OS70

Its exactly the same as what I was going to do to the raptor until on my way back from cambridge last weekend the thought hit me...
Why dont i just get another 600, hack off the front... or...
even redesign the frames, shuffle it around and try and *improve* it with a 70 size engine heh.

Now in this case, the word *improve* is used in a very abstract fassion heh.

If you think the std frames are rigid enough, maybe i'll opt for the lightest material with the same strengh as the origional frames...

I will see what I can do about modeling it...
I would do it on the computer but as it stands I dont have any appropriate software and havnt modeled anything in years :S
Plus i would need a 600 model to start with...
I only have 4 years give or take a couple of months here heh.

But I still need a job to get the 600 airframe, its amazing how little you can live off if you know where to get specific things from around here though

£11 (inc £3 for backy lol) last week

-Jvr

Ps,
flybarless sounds fantastic but again...
I'm a studnet heh.
Although, maybe I could fabricate a mechanical reduction for the servos and just run flybarless anyway...
Think it'll work

pps, something went wrong with the banana bread...
I got myself one big banana cookie *sighs*
11-06-2007 02:16 AM
 
 
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Ace Hobby . JR-Spektrum . E-flite

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CAD - Engineering - Technical > Re-designing a helicopter.
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