I am surprised by your comment on them being tail heavy. I have weighed 4 different H36 aircraft and they all came in close to each other in C of G. See attached for my own aircraft. Cheers. Nige.
From: Michael Stockhill Sent: Friday, October 02, 2015 11:04 AM To: [email protected] Subject: Re: [DOG mailing list] H36 Tail wheels My friend tried a later-model tailwheel fork with the rubber dampers on his H-36. I wasn't present, but recall that it is far heavier and put an already tail heavy bird way out of CG limits. There were other issues that prevented retrofit, if I remember correctly. MLS On Thu, Oct 1, 2015 at 4:56 PM, Rob Thompson <[email protected]> wrote: The early H36 models had a straight un-damped tail wheel fork which, due the wheels being forward of the centre of gravity and the heavy tail weight can induce some quite nasty oscillations. As a result of this Hoffman later introduced a new tail wheel which has shock absorbing rubbers. This reduces dramatically the oscillations but is more prone to shimmy. If the tail wheel cables are too tight the steering becomes VERY responsive to the slightest pedal movement. If the cables are too loose you get shimmy. Takes a bit of experience to know when it is just right. Real pain when you have to take the tank out each time to get it right! Rob Thompson 0429 493828 Please note that my new email address is [email protected] ------------------------------------------------------------------------------ From: [email protected] To: [email protected] Date: Thu, 1 Oct 2015 21:09:03 +0200 Subject: Re: [DOG mailing list] Morning Glory Cloud Documentary Most interesting and helpful thanks Michael. My Dimona is also a bit of a beast on the ground compared to other taildragger aircraft I have flown. I will keep you pisted. Thanks for taking the time to write the detail. Regards. Thys Sent from my Samsung Galaxy smartphone. -------- Original message -------- From: Michael Stockhill <[email protected]> Date: 01/10/2015 20:57 (GMT+02:00) To: [email protected] Subject: Re: [DOG mailing list] Morning Glory Cloud Documentary Hi, Mathys, I own an H-36 and also maintain one belonging to a friend. Between the two of us, we have had some interesting tailwheel issues. My bird was the scariest tailwheel aircraft I had flown ( about 800 hours in various Super Cubs, Cessna 180's and 185's and DH Beavers, etc.). If you breathed on the rudder pedals during takeoff or landing when the tailwheel was on the ground, it would threaten to leave the runway, and on two or three occasions I suffered PIO (pilot-induced oscillations) that shook my teeth. What I finally discovered was a logbook reference to a tailwheel fork repair. The fork was rewelded at that time with absolutely no trailing rake. We rebuilt it with 7 degrees aft rake and that demon was tamed. It now actually reminds me of a normally operating aircraft. In the case of my friend's Dimona, most landings resulted in scary tailwheel shimmy--I thought it would take off the tailboom. He mitigated this at first by making wheel landings and holding the tail off as long as he could. On the couple times I experienced it, I braked as much and as soon as possible to get slowed down. We tried various tailwheel tire pressures and checked balance, etc.. It has been a while, so my recollection is a bit vague, but what I did discover by looking at the tailwheel fork while installed, the shoulder of the weldment where the vertical shaft enters the lower flanged spacer was not parallel with the face of that spacer. Upon disassembly we were able to discern some bending of the shaft at that point (the shoulder of the weldment and the tailwheel vertical shaft). We had a whiz of a machinist fabricate a new shaft and other parts of the tailwheel fork. I test flew it afterwards and it was a different airplane. Rudder cables were also replaced at a later date. Hope some of that is of help to you. Michael Stockhill Polson, Montana, USA On Wed, Sep 30, 2015 at 3:40 AM, Mathys Kuhn <[email protected]> wrote: Hi Everybody I operate a mid 80’s model Hoffma Dimona in South Africa. Lately I started experiencing a significant tailwheel shimmy at low speed after landing on a tar runway. Has anybody ever experienced something similar? ANY ADVICE? Many Thanks Mathys Kuhn Training Captain T: 0825685614 C: 0825685614 F: 016 9330248 e: [email protected] From: [email protected] [mailto:[email protected]] On Behalf Of Ian Williams Sent: 23 September 2015 10:56 AM To: [email protected] Subject: Re: [DOG mailing list] Morning Glory Cloud Documentary Apparently only able to be viewed in Australia. Sent from my iPhone On 23/09/2015, at 13:05, Rob Thompson <[email protected]> wrote: G'day All, For those of you who missed it, the Morning Glory Cloud Documentary is on SBS "Catch Up" http://www.sbs.com.au/ondemand/video/521484355510/secrets-of-a-strange-cloud cheers Rob Rob Thompson 0429 493828 P Please consider the environment before printing this e-mail. ---------------------------------------------------------------------------- Attention: Please note: This email and its content are subject to the disclaimer as displayed at the following link http://www.comair.co.za/disclaimer.html. Should you not have Web access, send an email to [email protected] and a copy will be sent to you. ----------------------------------------------------------------------------
Weight & Balance Form NHB.doc
Description: MS-Word document
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