Fuel Price

[facthunter]

Topic is fuel price, guys. Just a reminder. Nev

[skippydiesel]

3 hours ago, BrendAn said:

Everyone I know that works on them does a 600 gearbox inspection. It must be in a manual somewhere otherwise they would not do it.

Only if running on 30%+ AvGas or real old 912's without overload/clutch (I understand the slip clutch has been a standard fit for many years)..

 

My last 912ULS was still testing okay at 950 hrs - never had a Gbox inspection😈

[Moneybox]

I can only get 91 in town if the unreliable 98 bowser is down. I asked my L2 about it, he said "That's all I ever run, you'll never know the difference".

[facthunter]

I'd like to know it had no ethanol in it.  Also Octane for Mogas is not directly convertible to Avgas. Avgas besides being more reliable as to content  quality, has better anti knock performance for the same number. Avgas has 2 numbers Like LL100/110. Lean/rich. Nev

[BurnieM]

I believe legally non ethanol fuels are allowed to have up to 1% ethanol to allow for ethanol previously transported in the same tanker.

 

[Thruster88]

Is it true that ethanol will absorb small amounts of water that may be in the bottom of fuel tanks or gascolators that don't have drains and allow it to pass with out harm through the carburetor? 

 

Yes I have seen gascolators that don't have drains.

[skippydiesel]

2 hours ago, Moneybox said:

I can only get 91 in town if the unreliable 98 bowser is down. I asked my L2 about it, he said "That's all I ever run, you'll never know the difference".

As I mentioned, Rotax allow for a  the 80hp to be operated on 90 RON, however further reading indicates, to me, that using such low RON fuel brings with it "knock" risks, that need to be understood & managed.

Using higher RON fuel, reduces the risk.

I am not familiar with the 80 hp, however am aware that, in the 100hp, using 98 RON would seem to near eliminate the risk of "knock" . Check out the Operators Manual Page 5-8

5.1.1) Power setting
 

Sorry cant seem to copy the attached graph.

 

You might also like to look up Rotax Service Bulletin (SB) SB-912-079 R1 (same graph appears in this publication)

 

Additional thought; I understand that higher RON fuels allow for better altitude performance. What this might mean for a Rotax 912 being operated below 10,000ft is not entirely clear to me.

 

LAME's, L2's,  well meaning friend, Forum advisors (me) -

Always listen to their advise BUT they are human, just like the rest of us.

They can be reluctant to give up cherished beliefs (myths) and make errors.

Can be unduly attached to the maintenance/operating doctrine of one engine type (LYCon?) that is then applied to another (Rotax?) without real understanding of the differences.

As PIC/maintainer its your responsibility to decide how to look after (fuel type) your aircraft.

Treat all advise with scepticism - apply your own experince /logic and if all else fails, follow the Rotax advise, as writen in various Manuals & SB,s

😈

[Thruster88]

Another aspect of these wars is Fertilizer, somewhat boring if you are not a farmer, however we all have to eat. Nitrogen is produced in the Persian Gulf from natural gas, Russia is also a major exporter. Prices have risen at a greater rate than petrol, diesel since the n & t war started. As a farmer it has me thinking, will very high input costs reduce production/ yield of crops. Suppy and demand is well balanced atm, we are going for it. Much like oil a small reduction in production will increase price. A small increase in the price of wheat results in the price of bread going up by a much greater amount. There is currently about 30 aussie cents worth of wheat in a 680g loaf.

[Bernie]

Fuel on K'gari is $4.25 ...

Bernie.