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richard.goode(at)russiana
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 Posted: Thu Jul 22, 2010 8:31 am Post subject: Mogas |
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There are a number of issues:
<![if !supportLists]>· <![endif]>The octane of aviation fuel is measured differently than that of motor fuel. Extremely roughly, if you add on 10 to the aviation octane you will get the automotive octane for that fuel.
<![if !supportLists]>· <![endif]>M14P officially uses the fuel B91, which is 91 octane, but it is absolutely fine with 95 octane automotive fuel.
<![if !supportLists]>· <![endif]>BUT the real potential problem is that of vaporisation, particularly on a hot day if the plane has been left out; aggravated if you have “winter” Mogas being used in the summer.
Richard
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Herefordshire
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
[quote][b]
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psb777
Joined: 12 Aug 2009
Posts: 34
Location: UK
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| Posted: Thu Jul 22, 2010 1:52 pm Post subject: Re: Mogas |
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But is the 88/97 Mogas pump at Gap-Tallard aerodrome better than the 95 octane cutoff you quote. 88/97 is MON=88 RON=97 octane. I think also that when the M14P manual says "B91/115 at least 91 octane" they refer to 91 as the MON. In which case, according to the M14P Maintenance Manual, 88/97 mogas is not good enough because its MON=88.
The ten point difference between avgas and mogas octane ratings is unsupported by anything I have read. In the USA roadside gas is sold with an AKI octane rating. AKI is the average of MON and RON. Usually there is a 8 to 10 point difference between MON and RON. So, in the USA the same fuel has an avgas MON 4 to 5 points lower than its mogas rating. Not so in Europe where AKI is not used. MON and RON mean the same for both avgas and mogas.
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Paul Beardsell
G-PYAK http://beardsell.com/flying/g-pyak
Yak-18T http://beardsell.com/flying/yak18t |
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