I don't have the W&B info on my friend's H-36 here, but I do remember weighing it and finding the numbers way aft, somewhere on either side of the aft limits when flown solo. My own H-36 is fine. I can't account for the difference, suspecting perhaps an undocumented heavy repair, and the very lavish heavy beautiful refinish that was done. It has been a few years, but I did some calculations for adding a weight in the nose, but with the relatively short arm it was impractical.
Life is great, MLS On Thu, Oct 1, 2015 at 8:19 PM, Nigel Baker <[email protected]> wrote: > 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 <[email protected]> > *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] >> <[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] <[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. >> >> >> ------------------------------ >> >> >> >> >> >> > > > > --------------------------------------------------------------------- > You are subscribed to the Dimona Owners Group mailing list. > To unsubscribe, send email to: [email protected] >
