what material you are using for making the pushrod?

Regards,
Dileep

carbon fibre........i use alluminium alloy rods....they r ceap

where it will be available? in hardware shops? let me know specification of alloy rods

Dileep

in hardware shop ask for wire that is used for making Reinforced concrete.the wire that is used for tieing two iron bars.

Knitting needles can also do the job.  A number 15 (about 2mm) should be good enough. The sell for <10 rupees each  and the
length is usually 30cms. You can get it in any fancy store.

Try Piano wire in the range of 13 to 17 No.(SWG). I hope it will solve the purpose and will be cheap.

You can also use broom sticks with all-pins at the end bended in z shape for small parkflyers. Dirt cheap.

like this...
http://www.rcindia.org/electric-planes/3dbatix-diablo-build/


Regards
Ankur Kaul

How about using bicycle spokes for coro planes? Is it heavy?

Ya its quite heavy,thats the first thing i tried..

Quote from: mankhand on August 27, 2010, 01:34:39 PM
Ya its quite heavy,thats the first thing i tried..

then which is the best/suitable material especially for coro planes?

I am no expert but i will place my bets on Carbon Fibre rods (if you have)  or Knitting needles (easily available and not very heavy)

Kabab sticks (wood/bamboo) were mentioned before.  Of course, you will need some kind of metal ends.

Quote from: xxkrishxx on August 27, 2010, 01:26:47 PM
How about using bicycle spokes for coro planes? Is it heavy?

they are from 5 to 8gms depending on which ones u get (small or large) for Rs.1-2/-

The wire used for holding iron rods is strong and light.

Quote from: mpp on August 27, 2010, 02:19:19 PM
they are from 5 to 8gms depending on which ones u get (small or large) for Rs.1-2/-

u mean the one which dinil also mentioned?

Quote from: dinil on August 27, 2010, 12:12:06 PM
in hardware shop ask for wire that is used for making Reinforced concrete.the wire that is used for tieing two iron bars.

Quote from: xxkrishxx on August 27, 2010, 02:38:16 PM
u mean the one which dinil also mentioned?

yeah the same.. Actually i found many just lying around my building. thanks to the crows who prefer it a lot for building their nest and 'hack' it off some construction site!!  

"they are from 5 to 8gms depending on which ones u get (small or large) for Rs.1-2/-"  that is for cycle spokes.. sorry was not clear there...

That tie rods will come as rolled one..Simple straightening is enough?

We recently started using Aluminum Knitting needles cheap and light. Make sure you heat it and bend before doing Z bend.

hi,

i even tried bamboo stick from kites,  with office pins/clips for Z at the ends.

dont forget to roll thread at the ends between bamboo and office clips and put some CA for ultimate strength

I've seen this technique in a video..In tat the guy is taking a rod like bicycle spokes..He is cutting app 2inches from top n bottom..He is bending the top piece to z bend,screwing clevis in the bottom threaded piece.. He is inserting these 2pieces in a CF tube's top n bottom n applying glue..Push rod is ready.. Any one tried this?

I have used this technique. It works but not good in a long run.
Problems i faced
1. After adding glue, adding spokes and reinforcing with thread at both the ends of cf , it becomes heavy (comparatively)
2. The carbon fiber tube starts to widen, and ultimately the cf fibers starts to rip off.

Use knitting  needles(#14) instead.
Final Weight in grams of cf+spokes  = 7-8grams aprox
Final Weight in grams of knitting needles = 4grams

The problem is that I don't know whether I can get Knitting needles here in Hubli..Which kind of shop sells this? Can u post a pic of tat pls..

Any shop that sells hosiery items should have it. You may try the ladies cosmetic shops and the ones that sell items like socks / undergarments  

Hey guys i got a knitting needle of 15cm length..Is this the one u mentioned?

Quote from: saurabhhsrivastavaa on August 30, 2010, 04:42:07 PM
Any shop that sells hosiery items should have it. You may try the ladies cosmetic shops and the ones that sell items like socks / undergarments 

There is a particular word for this kind of a store and I have always wanted to use this word. Thanks for giving me the chance - It is a Haberdashery or a Haberdasher's  store. they sell things like buttons, ribbons, sewing and knitting items etc.

I feel Cycle spokes are a better bet in coro glow models. Advantages
1. One side is threaded so goes well into a clevis
2. Very strong - Can take all the force during 3 D flying
3. Cheap and easily available.
4. Weight being about 5 gms is not too much when considering advantages.
And then seldom is the full spoke used. Most often only 1/2 the spoke (Threaded side) is used when the servo's are placed near the control surfaces.

I'm not sure what would work well in electrics, (Never made them) but CF rods with office U pins seems to sound good
Doc