What stops the rust ??

[Si_B]

After reading the last thread on knackered or rusty rears (by that I mean bearings ), I wondered what might be in the different fuels to stop the rust forming, or can it be attributed to oil content as someone mentioned ??. I've been running with the 4 stroke 20% optifuel this year (which has a 20% oil content), for no other reason than it was what was available when I bought it, and the rep said it would be just as good in my 4 stroke aero engines as in my heli (I use the same fuel in all my planks as my heli's).

I'm about to run out, and my local store only stocks the copter mix stuff which has an 18% oil content. They also stock Rapicon which has the higher oil content, so I'm tempted to go down that route.

I don't want to start a bun fight, but has anyone gone from optifuel to Rapicon recently ??. How do you find it ??

Once again, I've been happy with Optifuel but I want to stay with a high oil content, and I can pick up the Rapicon locally without having to buy in bulk and pay postage etc. Just checked my heli's and so far I've got no signs of rust in any of mine.

[F.arch]

rapicons a good fuel
For no rust just drop in some after run oil at the end of the day it works for me

[Steve]

my local store only stocks the copter mix stuff

If they stock Model Technics Coptamix, then the shop is almost certainly supplied by J Perkins Distribution. Perkins have arguably one of the best supply chains in the UK, and anything ordered from them will be in stock in your local shop within 2/3/4 days normally.

Why is this relevant? Well, because MT do a massive selection of model fuels (have a look at their website) and if you want a box or a few bottles of anything in particular, just ask your LHS to get it in for you on Monday. I'm pretty sure you'll have it before the weekend.

Don't just make do with what's on the shelf, ask for what you want.

[waveydavey]

I don't get rust using Rapicon at all. I did with all of the others.

[Guest]

I've used Rapicon before
Switched to Optifuel for 4 gallons

Now back on Rapicon

I found the Optifuel sensitive to needle settings, which meant I had to constantly adjust needle, even on the same day flying
Not really got it right, just put up with it

Rapicon doesn't seem to mind a few clicks either way

Rapicon is FREE delivery from Rapicon or EvoRC

[xygax]

Rust:
The oxidation of Iron or FeO2 The best inhibotor of rust is to remove the oxygen thereby stoping it forming in the first place. this can be achived by putting the componant in an enviroment whre the oxygen is prevented from coming in contact with it. either by putting a film of protective coating on the e componant for instance oil ore displacing the oxygen with and inert gas either nitrogen or carbon dioxide.

Thare a couple of ideas

Steve

[Hangar-7]

Steve you have to get your chemistry brushed up a bit.....lol, iron oxide, Fe2O3. Normal rust occurs on reactive metals such as iron, due to the presence oxygen and water, H2O from atmosphere as in a humid (damp) place. So by applying oil you're really keeping out water. Any oil is an water repellent - so it works. Engine oil works better because it is viscous plus isn't volatile.

You can also get bimetallic corrosion - which is more difficult to prevent. Many of the engine parts are bimetallic but a reputable manufacturer ensures that bimetallic corrosion is minimised by carefully choosing alloy composition. Sacrificial cathodes comes to mind but better not go there at this time of the night.

Cheers

[Boggy]

Rust:
The oxidation of Iron or FeO2 The best inhibotor of rust is to remove the oxygen thereby stoping it forming in the first place. this can be achived by putting the componant in an enviroment whre the oxygen is prevented from coming in contact with it. either by putting a film of protective coating on the e componant for instance oil ore displacing the oxygen with and inert gas either nitrogen or carbon dioxide.

Thare a couple of ideas

Steve

Steve you have to get your chemistry brushed up a bit.....lol, iron oxide, Fe2O3. Normal rust occurs on reactive metals such as iron, due to the presence oxygen and water, H2O from atmosphere as in a humid (damp) place. So by applying oil you're really keeping out water. Any oil is an water repellent - so it works. Engine oil works better because it is viscous plus isn't volatile.

You can also get bimetallic corrosion - which is more difficult to prevent. Many of the engine parts are bimetallic but a reputable manufacturer ensures that bimetallic corrosion is minimised by carefully choosing alloy composition. Sacrificial cathodes comes to mind but better not go there at this time of the night.

Cheers

i am sooooo glad i didnt ask this one!!

[xygax]

Well it was 30 years ago i did chemistry..... Fe2O3 it is then

Steve

[Nick B]

i am sooooo glad i didnt ask this one!!

The forum needs a woooooosh right over my head emoticon hey Ron

[LipolyGone]

What like this one Nick? :xygax:
Lol u should come over some time Nick steve can talk you through electronic speedcontrol theory any time ya like

[Eckchaz]

Fe2O3 it is then

Sorry Steve, you are wrong mate .. the proper technical term is "SBS"... Also known as "Shitty Brown Stuff" to us lamen's!