G'day again Kurt, Something to consider.... Hoffman and Diamond made undercarriage bows which varied in the profile of the section which sits under the fuselage. This means that there are a few types of the metal straps. I have experienced two types. Maybe there are more. My experience was that if you get the wrong metal strap....it just won't fit.
regards Rob Rob Thompson 0429 493 828 On Sat, Nov 4, 2023 at 4:34 PM Kurt Redinbaugh <redinbau...@gmail.com> wrote: > Thanks again > Kurt > > On Fri, Nov 3, 2023 at 2:13 PM Rob Thompson <amessageto...@gmail.com> > wrote: > >> - The Andair FS16 fuel shutoff valve (andair.co.uk/) is approved In >> Australia. I guess (but don't know) that the approval trickled down from >> EASA or FAA. These valves require a 1/8" NPT male to 14mm male adaptor. The >> only adaptor I could get needed drilling out to ensure adequate flow. >> - The undercarriage rod-ends are Hirschmann standard design >> - UC straps - Diamond Aircraft would have a monopoly on these. >> >> No videos that I know of. >> >> regards >> Rob >> >> Rob Thompson >> 0429 493 828 >> >> >> >> On Sat, Nov 4, 2023 at 7:46 AM Kurt Redinbaugh <redinbau...@gmail.com> >> wrote: >> >>> Hi Rob >>> Thanks for your prompt responses and support! >>> Have you a source for the time limited parts for the H-36, specifically >>> the rod end bearings, fuel shut off valve and the landing gear bow brackets? >>> A search for these part numbers on the net does not get any results for >>> me. (Please excuse the poor sentence structure but you get the idea,,,) >>> Has anyone done a YouTube of the 3000 hour inspection? >>> Thanks again >>> Kurt >>> >>> >>> On Wed, Nov 1, 2023 at 5:32 PM Rob Thompson <amessageto...@gmail.com> >>> wrote: >>> >>>> Attached is the 3000hour inspection schedule. Check that everything is >>>> still current. >>>> >>>> In Australia our Gliding Federation (GFA) manages registrations so to >>>> do a 3000 hourly you need to be a GFA authorised maintainer with a Survey >>>> Rating from them. A GA maintainer can only do the inspection if the >>>> aircraft is registered as a GA aircraft....which very few are. >>>> regards >>>> Rob >>>> >>>> Rob Thompson >>>> 0429 493 828 >>>> >>>> >>>> >>>> On Thu, Nov 2, 2023 at 9:55 AM Kurt Redinbaugh <redinbau...@gmail.com> >>>> wrote: >>>> >>>>> I fly #3660 in Nevada and am coming up on the 3000 hour inspection. I >>>>> have not noticed the aileron issues noted but am concerned because this >>>>> ship is tied down on the ramp with full covers during the summer months >>>>> when we get temperatures over 100 degrees f. Your pictures of the bearing >>>>> issues would be very helpful in determining the condition of the bearings >>>>> in #3660. >>>>> Who can I find that is qualified to perform the 3000 hour inspection? >>>>> My A& P with IA is an instructor at Abaris Training here in Reno and >>>>> consults with all the leading airframe manufacturers worldwide so I am >>>>> comfortable that he understands composites. >>>>> The nearest Limbach service center is in the UK. Who can I use to tear >>>>> down and inspect my engine stateside? >>>>> I did send the prop to Hoffmann for IRAN with satisfaction (expensive!) >>>>> Thank you for your posts-they are always informative. >>>>> Kurt >>>>> >>>>> On Mon, Oct 30, 2023 at 9:49 PM Ian WIlliams <i...@agcon.co.nz> wrote: >>>>> >>>>>> Hi All, >>>>>> >>>>>> I thought you all may be interested in the following >>>>>> >>>>>> >>>>>> >>>>>> 1. We have finally got our replacement prop from Hoffmann (10 >>>>>> mths) and was rather expensive so when I was told a forklift fork had >>>>>> gone >>>>>> thru the box in transit my reaction was rather predictable. >>>>>> Fortunately it >>>>>> was not damaged >>>>>> 2. Before this happened, I had contact with Airmaster props here >>>>>> in New Zealand. They could produce a really nice little constant >>>>>> speed >>>>>> prop (electrically operated) which would be a real plus for the L2000 >>>>>> Dimona”s. However I got a call from the head honcho of NZ CAA >>>>>> airworthiness >>>>>> who totally rejected the idea. (being a type certified aircraft) >>>>>> Hence the >>>>>> Hoffmann prop. However now the Limbach engines no longer have EASA >>>>>> approval, that may change the H36 type certificate to enable “special >>>>>> Category” or even “experimental” so if there is anybody interested >>>>>> in >>>>>> installing an Electric Airmaster prop that will fit on an L2000 >>>>>> Limbach >>>>>> (correct rotation) let me know as I have organised 2 blades (Made by >>>>>> Sensnich). >>>>>> 3. I think the cracked ferrells of the props has been caused by >>>>>> excessive temperature and humidity levels in our uninsulated, shingle >>>>>> floor >>>>>> and wet hangar over a long period of time. So I am thinking of a >>>>>> controlled >>>>>> heated insulated blanket over the prop and engine. Raychem Autotrace >>>>>> heating cable seems a good suggestion or a slightly modified electric >>>>>> blanket. >>>>>> 4. Currently I have almost finished an annual inspection on H36 >>>>>> S/No 3667 ZK-GPH It has been a real mission. I found a turnbuckle >>>>>> fork >>>>>> end of one of the thrust cables under the engine was broken .. and >>>>>> had been >>>>>> so for a long time so was held only by lock wire. Quite strong lock >>>>>> wire I >>>>>> reckon >>>>>> 5. I have ferried it around NZ for subsequent owners and the >>>>>> aileron control was unacceptably stiff, to a point of “sticking” when >>>>>> operated. Making it a really unpleasant little rocket to fly. >>>>>> >>>>>> This H36 was not a Thai one, but was imported to NZ from Italy (tho >>>>>> German registered D-KEBA) in 2010. However it does have the early >>>>>> “aileron push rod in compression when both ailerons are forced upwards. >>>>>> This was a design problem which was corrected with later serial No’s >>>>>> which >>>>>> had the rods in a tension mode. The aileron bell crank for the older >>>>>> Dimona’s is fabricated from tube while the later (tension) bellcranks are >>>>>> made up of flat plate and there is only 3 bearing sets in the wings as >>>>>> opposed to 5. >>>>>> >>>>>> >>>>>> >>>>>> Now for the jucy bit .. >>>>>> >>>>>> We made a detailed inspection of each of the 10 bearing sets (5 per >>>>>> wing) with a small camera and found some of the bearing sets (3 ball >>>>>> bearings pointing inwards on a 3 piece metal “holder”) mounted on wooden >>>>>> mounts ie the control rod passed thru the bearing sets and through a >>>>>> hole >>>>>> in the mount. We found that some bearing sets were not installed dead >>>>>> centre of the mounting bracket hole The over all clearance being about 1 >>>>>> to 2 mm. >>>>>> >>>>>> The upward load on the ailerons of the H36 when doing say 90 Kts is >>>>>> REALLY high. And I think is underestimated. Hence the compressive load >>>>>> into the pushrods is also VERY high forcing the rod to bend like a snake. >>>>>> Putting a high lateral load to each bearing set. >>>>>> >>>>>> So with misaligned bearing sets some of the bearings were not >>>>>> touching the rod hence “rubbing” on the wooden bearing set mounts. So >>>>>> that >>>>>> is why the ailerons were really stiff in flight but seemed OK on the >>>>>> ground >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> To repair was a mission. We didn’t want to put holes in the wing so >>>>>> designed a cutter system which we made from a short length of brass >>>>>> turned it down to 18mm, put an 8mm thread in one end, rounded off the >>>>>> other >>>>>> end and drilled a hole thru the thing used a 6mm drill cut off and a >>>>>> cutting edge ground so it protruded from the brass”slug” about 3 -4 mm. >>>>>> we then used an old push rod with the “slug” on one end and a battery >>>>>> drill >>>>>> at the other and with great care, removed the mounting bracket material >>>>>> as >>>>>> close as possible to the metal bearing fittings. >>>>>> >>>>>> >>>>>> >>>>>> So it still needs a test flight but problem solved. I think >>>>>> Hoffmann has issues because prior to changing the push rod configuration, >>>>>> there were about 5 different variations of bearing sets in the wings. >>>>>> >>>>>> >>>>>> >>>>>> If any of you want to see some pictures of the procedure let me know. >>>>>> >>>>>> >>>>>> >>>>>> Our Dimona (ex Thai) bearing sets had a solid nylon outer including >>>>>> the outer ball race, so we had no choice than to make big holes and >>>>>> replace >>>>>> them. As they all were seized Another Ex Thai (currently being >>>>>> restored) >>>>>> didn’t have ball type bearings, just Teflon (or nylon rings) S/no >>>>>> 3667 >>>>>> fortunately had proper bearings (ie with a metal outside ball race) and >>>>>> a >>>>>> nylon “tyre” against the push rod. >>>>>> >>>>>> >>>>>> >>>>>> So I thought you all may be interested. I am astounded that the >>>>>> aircraft has been flying for over 40 years like this and would be >>>>>> interested in your comments >>>>>> >>>>>> >>>>>> >>>>>> Best regards >>>>>> >>>>>> >>>>>> >>>>>> Ian Williams >>>>>> >>>>>> Drury >>>>>> >>>>>> Auckland >>>>>> >>>>>> New Zealand >>>>>> >>>>> >>>> --------------------------------------------------------------------- >>>> You are subscribed to the Dimona Owners Group mailing list. >>>> This list is archived in public. http://waikeriegliding.com/dog/ >>>> To unsubscribe, send email to: dog-unsubscr...@lists.riverland.net.au >>> >>>
