Hi All,
It is real interesting picking up the discussions re the H-36. I am working through .I guess the best word is refurbishing an Ex Thai H-36 S/no 3537. All good though. Solved the busted u/C question . the U/C as supplied is from S/no 3512 so all OK. However regarding the taco problem. Fluctuations like that generally is lack of lubrication of the cable. I look after a Pawnee towplane and it has similar problems. A year or so ago, I went through the process of reinstalling a Limbach L2400 from a Stemme S10 into an older model Grob 109, replacing the stuffed L2000. The L2400 did not have any taco drive so I ended up using a really nice VDO electric taco. And it works very well, It was able to be calibrated against a standard which was nice. The VDO Taco itself was a little larger than the standard one, and was a version which had an hour meter on it as well. There are 2 methods of deriving a signal. One from the Magneto and the other from the Alternator. I used the alternator drive (Because the tach could be calibrated) and was easy, but also a feed can also be got from the Magneto .. a small inductive pick up can be screwed into the top air vent of the Mag. . it is a standard part from Spruce and Specs. Of interest, I have a spare new one of those special rod ends (and bloody expensive) for the forward tailplane attachment AD. Any offer that I can't refuse would probably be accepted. It is the genuine article as supplied by Diamond. Best regards Ian WIlliams From: Angel Jimenez Martin [mailto:[email protected]] Sent: Friday, September 02, 2011 8:26 AM To: [email protected] Subject: RE: [DOG mailing list] RPM oscilations Thank you for encourage me Will, you are very optimist?. Angel _____ From: [email protected] Date: Thu, 1 Sep 2011 23:34:46 +1000 To: [email protected] Subject: Re: [DOG mailing list] RPM oscilations I don't think the old Dimona problems go away Angel, they just become new problems.... Will On Thu, Sep 1, 2011 at 8:36 PM, Alan McMaster <[email protected]> wrote: Hi, I had a similar problem a number of years ago, and the drive cable broke in-flight ( not nice ). The cable broke down at the engine end. It may have been caused by a lack of lubrication or a tight bend at that point. I make a point of keeping the lubrication up to that cable now. I also reduced the radius of the bend at that point (slightly). I installed an electronic tacho kit( as a backup). I hope this helps. Alan McMaster VH-XOV ----- Original Message ----- From: Angel Jimenez Martin <mailto:[email protected]> To: [email protected] Sent: Thursday, September 01, 2011 5:53 PM Subject: RE: [DOG mailing list] RPM oscilations Another problem has arisen, the rpm indicator, has begun to large oscillation especially at low rpm I removed the line and apparently is fine, only the part that connects to the indicator I found traces of a substance color like black rubber. Has this happened to someone who can help me?. I don't now when my old Dimona problems disappear. Angel -- Will Bignell PhD Candidate School of Agricultural Science Tasmanian Institute of Agricultural Research University of Tasmania CSIRO Food Futures Flag Ship M: 0418216780
