All good advice- it seems Old Erich Weston may not be as accurate as he should be with the back plate and rod adjustment and this also can contribute to rod problems AND the Aluminium channel at the front that rods bolt to- it can and has on us cracked AFTER Erich upgraded to 8mm rods
When you get an engine right you know you have it right. tech Bul 44 has much good advice and tech bul 53 is worth a read (max climb temp should be "below 180degC" and the formula for hot day conditions (38degC) is measured temp +(38-0.002 x pressure altitude) -outside air temp Also if using a VDO CHT gauge it is best the cold junction can be in the cockpit and if not then feed a jet of cool air to cold junction. In early days of Jabiru they did not realise this and had serious errors in CHT (if cold junction is raised 10deg C then CHT will read 10degC lower and you are unaware of the high CHT) gee the rain is heavy Macca \ 2009/12/29 Rob Thompson <[email protected]> > Here are some cooling ideas > - Factory baffles are dreadful however new ones can easily be made out of > 1mm Al sheet. Note where the old ones are inadequate and then use them as > templates. > - Follow Macca's advice and become obsessive/compulsive about sealing air > gaps with silicone and aluminium tape. > - Fit some decent baffles under the barrels next time you have the heads > off - the VW people have ones for 1600 motors that require only minor > modification. I think the ones from limbach that Nigel can get may not > require the heads to be off to fit them. > - Make sure the rubber seals are making good contact with the cowl and are > in good condition. > > While I am at it.... check that the prop change fork contacts the prop > evenly. All three of the H36's that Nigel and I did up were way out with one > bearing loading up the prop plate way before the other. I suspect this as > being a factor in breaking studs. > > cheers > Rob Thompson > > > PO Box 129, > Lawson, NSW, 2783. > mobile 0429 493828 > > > > > > > > > > > > > > > > > > > > > > > > > > ............................................. > > > ------------------------------ > *From:* Ian Williams <[email protected]> > *To:* [email protected] > *Sent:* Tue, 29 December, 2009 8:26:35 AM > *Subject:* RE: [DOG mailing list] hk36 crash > > Hi Ian, > > > > My view (for what it is worth) is that over the years there has been less > and less practical blokes coming along, and more and more who think that > high powered engineering takes place behind a computer screen. Resulting in > the thought that things get fixed or sorted out by divine intervention only > > > > While not a H-36, our little Grob 109A has just blasted skywards with its > Limbach L2400 engine. (it does have a H-36 designed pitch change fork > though) so that should be OK for the DOG list. > > > > Actually ... the take off performance is improved significantly of course > but the top end is much the same. > > > > I did spend a lot of time static balancing the Prop .... (had to load up > one side of the prop hub with an astounding amount of metal to get it > right) but the effect was incredible ... real smooth. Also got rid of a 2mm > thrust plate run out > > > > It would seem that crappy engine baffles, real bad cooling exit design and > an out of balance prop all conspired to screw the original L2000 engine > before it got to 500 hrs. It had a 3rd cracked case . > > > > Maybe engineers have a bit to answer to as well..!! > > > > > > Best regards > > > > Ian Williams > > > > > > *From:* Ian Mc Phee [mailto:[email protected]] > *Sent:* Monday, 28 December 2009 11:18 p.m. > *To:* [email protected] > *Subject:* Re: [DOG mailing list] hk36 crash > > > > It seems that JB did not listen to Lewis Zurgen (was rude to Lewis when he > tried to help) the original owner of hk36 GXD and he is the one that put in > the accumulator solenoid for a real reason to hold pressure in system after > a long soaring flight so as to unfeather prop and thus pilot had little > chance of learning and pilot did not have an understanding of Bings and > throttle setting for start. > > > > I am afraid there are people out there who can pass a flight test but not > really understand why they are doing a certain proceedure > > > > Another example is taxiing out with electric fuel pump OFF (which checks > mechanical) and then ele pump ON just before rolling. JB just left it ON - > am I too fussy or is that not done anymore? > > > > Ian M > > > > 2009/12/28 Rob Thompson <[email protected]> > > Ian mentions that the pilots of the crashed HK36 didn't have an > understanding of some of the engine systems....Can anyone explain to me how > they got a type endorsement with out knowing this? > > Rob > > > > PO Box 129, > Lawson, NSW, 2783. > mobile 0429 493828 > > > > > > > > > > > > > > > > > > > > ............................................. > > > > > > No virus found in this incoming message. > Checked by AVG - www.avg.com > Version: 8.5.431 / Virus Database: 270.14.122/2590 - Release Date: 12/28/09 > 07:16:00 > > ------------------------------ > See what's on at the movies in your area. Find out > now<http://au.rd.yahoo.com/movies/mailtagline/*http://au.movies.yahoo.com/session-times/> > . >
