hi,

got this scanned for sharing with all. good info 

regds

 

Apart from this one more reason which is difficult to notice if not observed .

Due to caster-oil fermentation fine fibers can lead your engine behave erratic . this is from my real time experience with OS 70 FS. be care full to check your fuel mixture every time before you fly .

saw lively.. 

 

Kinda hard to read... please email me scanned copies, and I will upload the high res versions.

this is an old saying from the indian aviation world and the saying is in hindi. loosely translated it means "..all boils down  to 'fuel' 'air' & 'Fire'.

Hey roopesh
Remember 6 month back ,,Ship and aero guys  struggled to tune up Rea  its just because of the problem i mentioned ,hope we both enjoyed the session .( kanji vachhcu ha ha ha )

that i told you, "saw lively.."   and you already taught me, when i was struggling with OS 46.. still keeping the strainer cloth like a treassure.. 

Hey i got one from cochin ,,wonderful filter cloth ,,got 1 mts , for a price of 20 rs. tried it with the fuel kept here in cochin dark brown turned pale yellow amazing filter .will get you 1 mts also use it for your fuel kept long time back ,not sure you r using it now .

Vinoetta.. the entire fuel is kept with me as intact.. used nothing and it is well kept.. can be use in coming flying events.. 

Quote from: madhavan on May 29, 2012, 10:39:19 PM
Due to caster-oil fermentation fine fibers can lead your engine behave erratic . this is from my real time experience with OS 70 FS. be care full to check your fuel mixture every time before you fly .

How does one do that?

How caster oil fermentation happens ? here is the possible way .

1. when u buy castor oil from medical shop there is no worry at all ,,it is manufactured and packed nicly .

2. cost of 100 ml medicated caster oil is Rs. 55 ( for an aeromodeller it might be on higher side )

3. in Kerala from the ayurvedic herbal shops ,raw caster oil can be brought  1000 ml.for rs. 60  so most of them go for the cheapest one which is not filtered or treated ,, by doing a conventional filtering the raw casteroil will turn into our fav lubricant .  

problem is with the fuel which is made from this kinda castor oil mix ,, the solution for rectifying the problem is once in 3 weeks the entire fuel need to be filtered , which i believe is not a herculean task .

Hope this information helps .

better thing to do is mix it only the amount you need for flying, never keep mixed fuel for so long

 

Quote from: madhavan on May 30, 2012, 10:16:30 PM
1. when u buy castor oil from medical shop there is no worry at all ,,it is manufactured and packed nicly . 

Medical shop castor oil is cold pressed and filtered therefore is almost colourless . Ideal lube for our engines is first pressed commercial castor which should be very pale yellow i've had no luck finiding this locally however. Dark yellow castor is solvent pressed commercial grade and if it has not been degummed no amount of filtering is gonna make it better and it will eventually gum up your engine, this has been my understanding. So what kind of filtering are you talking about sir?

Quote from: sushil_anand on May 30, 2012, 09:52:06 PM
How does one do that?

My question was how do you "check your fuel mixture"?