Rob Twice in Dimona and once in Falke (G109A has a scoop for air behind engine) I usually use a 25mm tube which picks up from rear of engine )- in an ideal world I would use 25mm SCAT hose and maybe a bit of a sink to pick up air. Have seen it done like that in GA engines
ian m On 3 November 2010 07:36, Rob Thompson <[email protected]> wrote: > Hey Ian, > What sort of aircraft have the coils failed in the 4330 magneto? > Can you describe more about the mod referred to that directs some > cooling air over the magneto...? > Rob > > > > > > > > > > > > > > > > > > > > > > > > > ............................................. > > > ------------------------------ > *From:* Ian Mc Phee <[email protected]> > *To:* [email protected] > *Sent:* Tue, 2 November, 2010 1:38:45 PM > *Subject:* Re: [DOG mailing list] Re:Sticking airbrake > > I have been caught 3 times in my life and in each case it was soon after > painting First was PIK20E second ?? and third was dimona which had just been > flown down from Archerfield after being bought from Geoff Edwards (the > Dimona s importer) Ever since on ground I load all gliders new to me or > after painting with 2 wing stands to simulate flying and check brakes then > and when airborne check brakes well before landing. In the PIKs case I was > on final and it is frightening not annoying!!!! A quick bunt and it worked > but after that we (the late Klaus Bretxxxx) set one airbrake to open 3mm > before the other. > > On another topic I have now heard of the 3rd failure of coil in Slick 4330 > mag 2 were dimona and other was falke and in all cases none had a jet of > cool air onto the magneto. I personally think it is a good simple mod on > slick (or Bendix on L0540). > > Bottom line annually always load up glider as if it is flying on ground > and test brakes then > > Ian McPhee > > On 2 November 2010 12:37, Nigel Baker <[email protected]> wrote: > >> Yep. >> It's more annoying on final approach. Slowing down seems to fix it when >> that happens. >> With age the spoilers warp. Probably also why yours has had a second >> spring added to the spoiler for closing. >> From Rob's and my experience it is due to the rear edge of the spoiler >> catching on the rebate in the wings skin. Fine when they were new >> and straight but not so good at age. >> >> You will have noticed that when the spoiler starts to open it slides >> rearwards first as it lifts. This is a function of the drive geometry. We >> chamfered the rear bottom edge of the spoiler with sand paper on on sending >> block. Also had to scrape the inside corner of the rebate in the wing clean >> off 20 years of Thai Airforce quality maintenance. We used a Stanley knife >> blade for this. On one wing we also had to chamfer the top edge of the >> rebate. We did this by dragging a Stanley blade at 90deg to the wing along >> this edge to scrape a chamfer. The idea is to make sure all this creates a >> ramp affect for the spoiler to pop up over the wing surface in that initial >> rearward sliding movement as the spoiler opens. >> Placing cardboard a couple of mm thick under the length of the back edge of >> the spoiler then operating will prove if the problems described are the true >> cause. >> Cheers. >> Nige. >> >> >> ----- Original Message ----- >> *From:* neville swan <[email protected]> >> *To:* [email protected] >> *Sent:* Tuesday, November 02, 2010 6:06 AM >> *Subject:* [DOG mailing list] Re:Sticking airbrake >> >> Hi All. >> >> Has anyone come across the problem of an airbrake that wont extend? No >> problem until last weekend when, during the DI, I found it impossible to >> extend the brakes with the cockpit handle, using a fairly hefty pulling >> force. I had to slide a feeler gauge under the rear edge brfore I could >> open the starboard brake panel (the port one is not a problem). I could not >> see anything amiss and added a small rubber 'buffer' to lift the rear edge a >> couple of mm., but it did not make any difference. Almost feels as if the >> torque tube is 'over centre'. Any ideas? >> >> Incidently, my brake panels have a small spring at the inboard ends, >> presumeably to help keep them closed. One panel has had an extra spring >> added about 3/4 out (not the sticking one). What is the norm? >> >> Neville. >> >> > > >
