RC India

regarding to the last post of discovery of the metal rods

http://www.rcindia.org/for-sale/snakes-throttle-linkage-and-landing-gear-strut/new/#new

there is yet a another discover done by me in the same industrial estate

its about the fiber glass cloth

found a shop who sells fiberglass cloth .

the varieties are:

1mm cloth ( also called as fiberglass paper)  :Rs:80/ sqft
2mm cloth ( woven fiberglass)  :Rs: 70/ sqft
3mm cloth ( woven fiberglass)  :Rs: 70/ sqft

can send if needed no packing charges shipping at actuals

can call me on 9738382454 if required  :salute: :salute:

Hi,
If any person is interested in glass cloth or paper. check with the person who deals in duct Airconditioning. this material is used in the duct of the AC units, which runs inside the false celings of offices.

Sandeep

This a very generous gesture Vishvesh. I'll might need some, will get back to on this.

@sandeepm: i even checked that he even had that quality. it very soft and has more quantity of silk than glass.
the ones which i have mentioned are in equal proportion i myself have used them. more over i plan to make a mold from thermocoal and give him for molding to get a fiberglass plane and even will do the same thing with the wing :thumbsup: :salute: :salute:

the complete plane made of fiber glass is expected to cost around  :Rs:700-800 ( made at their workshop) without the accessories like the tank, wheel, and all....

will try to make a sport plane out of it and let u all know the whole plane will cost around  :Rs:2000 in form of ARF( all accessories included)
 :thumbsup: :salute: :salute:

Thats sounds great.. I am interested in a pusher trainer.. can you make one

Hi all,
guys pardon me for my ignorance but after pondring over a couple of threads on 'fibreglass' across various threads, i hav figured out following things-
-its lot more stronger than balsa, so an airframe made out of fibreglass dosen't needs any reinforcements
-its structural strength is a couple of times more than balsa or reinforced foam
-can be easily moulded into shapes
-is economic (as mentioned by Mr. Vivesh)
but what am unable to understand is-
-what about its weight (heavier or lighter than balsa)
-what building techniques are used (can an airframe be fabricated at home using this or some fancy stuff like injection moulding or vaccum forming is needed)
Regards
-Bilal

Guys am asking this coz m planning to scratch build a VTOL platform (inspired by the 'avatar scorpion gunship' ) that is self stabalised and can carry a camera payload. I think instead of building the airfrane out of balsa or reinforced foam, it would be better to mould it out of fibreglass (if thats possible to do at home coz i can't find any moulding shop that work with fibreglass here in sultanpur). So any help from the experienced members is highly appreciated

Hi I wanted to know is it as flexible (1mm) as cloth n if u want to make shapes or mold it can I mold it n do u also hav the adhesive to mold it into shapes. 

@ drrajdeepbrar: it is very flexible just as a cloth..... i dont know how they mold it but i know that you can apply arildite and stick it on the frame. keep the layer of arildite as thin as possible by using some water and squeezing out the excess

@Bilal : the fiberglass if properly fabricated can be as light as a balsa plane or even lighter than that but you need to have the skill and know the techinique of fiberglassing. And i have no idea how injection molding is done heard some one does it there... will see and try to get some GF propellers moulded

PS: person has asked me to get a mould of the fuse or the wing and he will give me a fiberglass fuse made from the mold ( i would give him some more  :Rs:s and keep the weight low)

even heard some one does it there... will see and try to get some GF propellers molded

Thanx do u hav photo of the product just need to see th quality of texture.

sorry i dont have it now.... will post in 2 days time....!!!  :salute: :salute:

some pics of the cloth

Can araldite be thinned by water? I do not think standard epoxy dissolves in water

To the best of my knowledge GF propellers are usually glass filled plastic. They are not pure fibreglass.

The other products you are considering are fine. But do realise that propellers will have to be thoroughly tested over some time. A thrown propeller blade could have very nasty repercusssions besides being dangerous.

the rate seem rather high. it costs around $1:00 per metre square ie 10sq feet at hobbyking. and around $ 4:00 at tower per sq yard ie 9 sq feet.
Unless you meant sq metre and typed sq feet by mistake.
regards
Avijit

No, Araldite (epoxy) can not be thinned with water. Rapid epoxy can be thinned with meth, but it also makes it weaker 

I went to many f.g industry around in my town. The thing is that how a mold from thermocoal can bare the heat of epoxy used in f.g. .it cant be like that. They need mold of POP or  f.g it self. I am really intrested in making a f.g boat if any one has good ideas pl come up with it cz i have tried out with aradlite but didn't got nice result! Last option i thought is to make a wooden mold for f.g boat.
Regards,
Ghanshyam

There is something called MRF epoxy thinner which should be available in automobile paint shops. it is used as a thinner for epoxy paints and works with araldite.
I use it to thin the araldite before painting the entire bare woodwork in a glow powered model to fuel proof it.
it costed me  :Rs:180 for 1 lit or 500ml i forgot which size i bought
regards,
Avijit

Try some of the moulding material used in dentistry.
They use the stuff to make moulds of teeth.
something called Alginate- the cheap variety costs  :Rs:180-200 per 1/2 kg.
should be plenty.
Maybe a professional dentist- someone who knows a dentist could enlighten us further
Before you coat it with araldite/ FG epoxy, rub it with 4-5 layers of carnuba car wax. This helps in releasing the mould at the end.
just a suggestion - i haven't tried it yet. but when i need to replace or built a cowl this is what i will use.
regards,
Avijit

Alginate is impression material used to copy teeth. N separating media can be used insted of wax.

@ PankajC : the arildite cannot be thinner than water but i used it as a comparison..... it will be something like the liquid in "gulab-jamun"  (:|~....

@ sushil_anand: i spoke to the manufacturer he said around some time back(4-5yrs) he had done a GF prop used in a CESSNA / zenair (they probably use wooden... we have some army aviation unit planes here ) gonna get one done first even if it costs more... (the mold is gonna be made from the original masterairscrew ) the prop will gonna be properly balanced and will be tried and tested...... will let know the results.... :thumbsup:


@ avijit17basu  : the cost os the same that he told me.... even got it confirmed.... i guess there is some prob in customs(LHS cost more or they don't stock)....  and there is no personal profit in the stated cost.....


PS: the mold is gonna be made from thermocoal and then covered with fiberglass.... then it will be given for molding.... the dentistry material is costly and u need a lot of high precession tools to do it....

U can copy the plane with alginate n then pour plaster of Paris into the algina n make a mold. Then u can mild the fiberglass on it and remove the plaster if Paris mold.  Make sure u use some separating media between the plaster of Paris n fiberglass

actually i am gonna build a mold directly from cutting out templates by using the plan of the model.....  and thanks a lot for the help.... can u tell which store i can look for the stuff u mentioned and what exactly it is.... and how it works....??? :headscratch: :headscratch:  :salute: :salute:

Plaster of Paris is like 12-20 rs per kg and dental stone is much harder n just a bit more expensive. U ll get it at any place that sells dental instruments. Plaster is white n dental stone is green. IN belgaum ill get it easily next to the dental college n just find a first year dental student he'll tell u how to use it or chk out you tube.

I assume you are a dentist and have direct experience using these materials.
So you feel it is practical and cost effective to use these materials for aeromodelling. expecially to built some complex parts?

I was not suggesting personal profit at all. maybe the material is thicker or something- you have seen it and you feel it is worth the price- so you are the best judge
regards,
Avijit

I hav made parts for my car like shock caps.

@avijit17basu: did not mean that....... !! itz of industrial quality.....

@drrajdeepbrar : will surely try it out....!!! thanks

Well these materials are used to make denture material and yes some dental prosthesis are made of die cast material. N the procedure is almost the same. And its quite strong n not too expensive.

I need to know if this cloth is transparent n weather it can be painted n a sample photo of the cloth or u dont have it yet.

i have the photo and have some problem uploading it....

Is it transparent. Like can v paint over it n apply decal sheets

what i did was epoxy the FG to the plane blow some hot air(from a hot airgun or hair drier) press out the excess arilditde and leave it to dry.....  once dried u can see the wood.... sand it with a fine emery paper and its as smooth as u want it...!!!

Yes thats the best way to do it. But arildite is pretty expensive for this, it'll be great if you can find some alternate epoxy for glassing.

Photo pls.

here u go...............

The 2mm woven looks good to me :thumbsup:

i did not buy the 3mm an thicker coz it would be of no use....!!!!

Vishvesh,
did you check the weight per sq ft or sq mtr?

Isn't FG cloth meant to be handled with gloves on and with a very good mask when sanded? The glass dust is pretty bad if inhaled.

I thought that was only true for carbon fiber  :-\

Check this - http://www.airfieldmodels.com/information_source/how_to_articles_for_model_builders/finishing_techniques/apply_fiberglass_finish/index.htm

Damn :banghead: I've have been playing with glass cloth lately :banghead:

What were you doing with glass cloth?  :headscratch:

I was trying to make a fuselage :violent:

i was dealing with glass cloth............. doesn't make much of a difference if u have epoxyed over the cloth............ ya it is dangerous if used improperly but in most cases its safe....... if u don't inhale it purposely  :salute: :salute:

@pankaj: i have checked the weight as well will do it and post if tomo......!!!!

Well I don’t have much experience with fiberglass, but recently I completed a fiberglass boat. If you take the example of cement concrete, fiberglass plays the role of steel rod and resin as the cement. Fiberglass comes with different type (Tissue, matt & cloth). Preparing the resin is the tricky part. You have to mix 20~30% Accelerator(blue colour) in one liter resin, mix it well and then  hardener (colourless). Ask the seller for a correct mixture.  A direct mixture of both these solution ( Hardener + accl.) may create fire hazards, just keep them apart. If you want to make a mold from a master piece ( it can be balsa parts / Plaster of Paris/ plastic anything), you need Wax / PVA as the releasing agent.  

we use Araldite LY5052 and Ardur 5052 low viscosity epoxy ! its very rare in India and need some experience to deal with, we use different propotion's for diifferent applications and material!
and again its very costly because its aerospace standard ! there is saying in composites world "without making your hand dirty, you can't make composite part"

"there is saying in composites world "without making your hand dirty, you can't make composite part", very ture.
Resin will cost you Rs.50/- ~ Rs. 90/- max. per lit. The more quantity you purchase lesser the rate. What is the need of Araldite ( except applying on thermocoal)


And when you are in fiberglass everything become dirty yaar. Pants, shirts, table, chair everything and even my mustache also become fiberglass as I am a smoker and every time I take a puff of cig, bit of resin always stick there.

This is good. I am a total noob in this, last time i visited a hardware store asking for resin and hardener. He was like what are you talking about :-\ I ended up buying araldite standard. which is very expensive and very difficult to sand. Is there a local name for resin ???

its a basic meaning sir but other part what i am trying to say is lots n lots n lots of wastage while making part, both in terms of fiberglass as well as epoxy!

SLS
If you found epoxy difficult to sand wait till you have to sand hardened resin. You will curse yourself

where can i buy fibreglass online ? can i get in hyderbad ? which resin should i buy for fibre glass please suggest me. ???

@tejadilip

http://www.vortex-rc.com/product-category/other-products/fiberglass-cloth/

You can contact Zenith industrial supplies. They are dealing various types of resin. I bought Araldite LY556 (resin) hardner HY951 Aradur for fiber glass application. It has gel time of 30 mins which is quite good and medium viscous. You can get the contact details in http://www.zenithindustrialsupplies.com/contactus.html

Send them your enquiry, they will send you a quote, transfer the money, you will get your parcel.

You can try vortex rc for quick delivery. Else look at it in aliexpress.com. Search for fiber glass cloth.