What about we pay someone from nearby to Bacchus with drafting skills to draw plans (including shop drawings) from Dave Goldsmith's sprung tailwheel? The plans for the spindle part that fits into the fuselage can be done from any Dimona at annual inspection time so we won't have to pull Dave's apart. Then get the steel parts cut from appropriate grade metal, pay someone to do any necessary machining and get the lot welded by an aviation welder. Maybe we would have to make some sort of a jig to send the bits to the welder in..maybe not. From the experience Nigel and I had refurbishing the 3 dimonas and the way Hoffman sourced components I reckon it's a good bet that the rubber blocks are an off the shelf part.
cheers Rob Thompson PO Box 129, Lawson, NSW, 2783. mobile 0429 493828 ............................................. ________________________________ From: STO Airworthiness <[email protected]> To: [email protected] Sent: Thu, 28 January, 2010 1:50:52 PM Subject: RE: [DOG mailing list] H36 spung tailwheel Hi All, I would be interested in fitting the sprung unit. Probably will add a good kilo or so, which will equate to a min pilot weight increase of about 7 kgs. Dave Goldsmith's H-36 MkII VH-GFG also has the sprung tailwheel. It lives between Bacchus Marsh & Bendigo. From a GFA airworthiness point of view, exchange of the rigid wheel for the sprung one would not constitute a mod if the factory parts are used, but should we decide to build them locally a mod would be required for each aircraft to which the new assembly is fitted. This is easily achieved; we have done it before with oil filter installations. Regards JGV Senior Technical Officer, Airworthiness GLIDING FEDERATION of AUSTRALIA INC. [email protected] ---------------------------------------------------------------------- The Gliding Federation of Australia Inc invites you to visit the web site www.gfa.org.aunewcomers to gliding and soaring are invited to visit www.soaring.org.au------------------------------------------------------------------------------------------------------------------- This email transmission may contain confidential or privileged information that is intended only for the individual or entity named in the email address. If you are not the intended recipient, please be aware that any disclosure, copying, distribution or reliance upon the contents of this email is strictly prohibited ________________________________ From: John C [mailto:[email protected]] Sent: Thursday, 28 January 2010 12:00 PM To: [email protected] Subject: Re: [DOG mailing list] H36 spung tailwheel The only H36 with a sprung tailwheel that I know of in Australia is GJD owned by John Mason. The sprining consists of two rubber blocks which take the bumps out of the tail compared to the non sprung version. It does raise the tail slightly. There is a drawing on page 4.10 in the H36 parts catalogue. I did replace the top section on GJD when I imported it as there was a very slight bend in the vertical spindle and this caused tailwheel shimmy. The faulty part is still in the workshop. There's no place like cloudbase. John Callahan. ----- Original Message ----- >From: John Mason >To: [email protected] >Sent: Thursday, January 28, 2010 11:09 > AM >Subject: Re: [DOG mailing list] H36 spung > tailwheel > > >I'd certainly be interested in > that... > >John Mason - GJD >----- Original Message ----- >>From: Rob Thompson >>To: [email protected] >>Sent: Thursday, January 28, 2010 11:03 >> AM >>Subject: [DOG mailing list] H36 spung >> tailwheel >> >> >>I'm >> keen on the idea of getting a sprung tailwheel on our H36 - the rigid one >> is >> not at all good on rough surfaces. >>I think the sprung wheels may also >> reduce the "bunny hopping" on rough runways....can anyone enlighten me as >> to >> whether this is the case or not? >>Last time I saw a sprung one I didn't >> think it would be particularly difficult or costly to manufacture - >> perhaps >> we could get some plans drafted from one of the dimonas with a sprung >> wheel >> and see about getting a few made up with appropriate approvals. >>How many >> of you would be interested? >> >>cheers >>Rob >> >> >> >> PO Box 129, >>Lawson, NSW, 2783. >>mobile >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >>............................................. >> >> >> >> >> >> ________________________________ From: Ian Mc Phee >> <[email protected]> >>To: >> [email protected] >>Sent: Wed, 27 January, 2010 11:39:22 >> PM >>Subject: Re: [DOG >> mailing list] Dimona 1984 >> >>Interesting about tail wheel mod >> from Michael - sure gives smoother ride. >> >> >> >>You mention the heads/valves lasting only 300hrs. I would >> recommend to all analysis of exhaust at FULL POWER with lamdameter etc. >> You may find it is running slightly lean on full power (actually plugs >> look OK) but gas analysis does not lie. More recently i have been >> using digital CHT and you can really see what is happening. I set them >> up so full power CHT rises to about 170degC then very slowly falls. If >> you bring throttle back just a bit in revs CHT will quickly rise to >> 180degC >> and beyond. This proves to me you are running rich on full power- also >> confirmed on EGT. To achieve this it may be necessary to carefully >> thin out the end 6mm to 8mm of each the needle in carby and thus achieve >> the >> low CHT on full power. (do not think of touching jet) Fuel is cheap >> when compared to repairing heads. Limbach Tech bull 53 makes mention of >> max >> on climb of 180degC (forget what max the manual says - that is stupid >> value) >> Also Tech bull 44 (11page edition) is well worth a read. >> >> >>Ian mcPhee >> >> >>2010/1/27 Michael Grimwood <[email protected]> >> >>Hi John and Lasse >>> >>>I have owned a Mk1 H36 since 1988 (G-MRG in >>> the UK, now VH-VRG in Australia). It originally came with an >>> un-sprung >>________________________________ >> Yahoo!7: Catch-up on your favourite Channel 7 TV shows easily, legally, >> and >> for free at PLUS7. Check it out. __________________________________________________________________________________ Yahoo!7: Catch-up on your favourite Channel 7 TV shows easily, legally, and for free at PLUS7. www.tv.yahoo.com.au/plus7
