Just a small (but very important) correction on Russell's post re electronic ignition. Electronic ignition systems fitted to Limbach & similar have no facility to RETARD the ignition for starting purposes. They are fixed at FULL ADVANCE, thus the engine will kick backwards if an attempt is made to start on electronic alone. If the mag goes down during flight the electronic system will get you home, but for starting you need the magneto.
JGV From: [email protected] [mailto:[email protected]] On Behalf Of Rob Thompson Sent: Friday, October 2, 2015 12:53 PM To: [email protected] Subject: RE: [DOG mailing list] Re: Magneto + ele ignition Just correcting a typo...impulse coupling retards the spark so it happens just after top dead centre. Otherwise, like Nigel said dire consequences of a piston wanting to go in two directions at once. Rob Rob Thompson 0429 493828 Please note that my new email address is [email protected] > From: [email protected] > To: [email protected]; [email protected] > Date: Fri, 2 Oct 2015 12:04:11 +0930 > Subject: Re: [DOG mailing list] Re: Magneto + ele ignition > > I know a guy in Alice Springs who tried hand starting his Sonerai due to a > flat battery (L1700 with dual ignition) with both ignitions switched on. > He broke 3 fingers and the crankshaft. As he said it was a very bad day. He > is an earthmover and didn't work for a while. > Nige. > > > -----Original Message----- > From: Russell > Sent: Friday, October 02, 2015 11:35 AM > To: Ian Mc Phee ; DOG LIST > Subject: [DOG mailing list] Re: Magneto + ele ignition > > Electronic ignition of the type we use has no advance, so you cannot > start on electronic. > > Cheers, > > Russell. > > On 2/10/2015 11:02 AM, Ian Mc Phee wrote: > > > > About every 7 years of my flying I have heard of a slick magneto failure. > > > > On 3 occasions aircraft became difficult to start and last occurrence was > > to me 4 weeks ago while returning from gulf where it was real hard to > > start. Those at Gulf a few years ago may remember Diane Davey has real > > trouble with the falke & finally failed at tocumwal on beer way back to. > > Melbourne. > > > > With me we then used electronic to start then turned on magneto (UN > > earthed it) Finally on the last day was total mag failure so we came home > > from Thangool on electronic. Fortunately all the time home I was less than > > 20nm from airports (flew right over Amberley) all the way back with good > > paddocks as back up. > > > > Other issue about 18monthd ago I have had is the impulse spring break and > > just will not start. An electronic would have solved that one also. When > > I wire up dual ignition I do it like a 2 way light in your house so > > starter button will only work if one switch is UP & other DOWN or vice > > versa as you must not start on both as you will get a back fire which may > > damage carb diaphragm. > > > > Rob Handbury with his Stemme 10 with L2400 has had mag failure at > > Burketown right now. He only has single ignition. > > > > This has all made me think leave the heads same and fit electronic > > ignition & if you have a mag issue while away then just change the leads > > over & fly home. It is like carrying a jump start battery in your car. > > > > I gather Limbach will supply heads with dual plugs but notice those heads > > all have much longer threads on the spark plugs so must be a different > > casting head. When Ziggy in WA added extra plug to aeropower engines think > > it was 10mm (or was it 12mm) diameter plugs. It was not 14mm normal plug. > > > > I talked to LAME at Aero Enterprise Lismore & they do recommend 1inch SCAT > > hose of air onto the slick but when I asked the LAME at Mach 1 electrics > > he was less concerned. > > > > I do know Russell White and John Williams have dual ignition in their > > aircraft & if you do have trouble with slick magneto it could be extremely > > difficult & expensive to fix if in the outback as Rob is going through > > right now > > > > My bottom line is consider a dual ignition in your motorglider. > > > > Ian. Mc Phee > > 0428847642 > > Box 657 Byron Bay NSW 2481 > > AUSTRALIA > > > > > --------------------------------------------------------------------- > You are subscribed to the Dimona Owners Group mailing list. > To unsubscribe, send email to: [email protected] > > > --------------------------------------------------------------------- > You are subscribed to the Dimona Owners Group mailing list. > To unsubscribe, send email to: [email protected] >
