---------------------------------------------------------- Yak-List Digest Archive --- Total Messages Posted Sat 03/12/05: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:31 AM - Instruments (Mark Jefferies) 2. 12:32 AM - :>)) (Mark Jefferies) 3. 04:53 AM - Re: M14P Tach Generator / Yak 50 Fuel Sender (aaron marshall) 4. 05:05 AM - Re: Oil (aaron marshall) 5. 06:08 AM - Re: Yak-List Digest: 19 Msgs - 03/11/05 (Steve Dalton) 6. 06:38 PM - SNF 60 Cancelled (cpayne@joimail.com) 7. 06:38 PM - Re: UMA Tach (cpayne@joimail.com) 8. 08:42 PM - Re: Re: UMA Tach (DaBear) ________________________________ Message 1 _____________________________________ Time: 12:31:10 AM PST US From: "Mark Jefferies" Subject: Yak-List: Instruments --> Yak-List message posted by: "Mark Jefferies" Through necessity Aerostar have had to use instruments and other parts originating from the USA. This is due to the fact that instruments were supplied from Russia, in former times. The Russian instruments were made for the military, cost was not a consideration, reliability was. Russian instrument are superior, no getting away from that. The manufactures of instruments now don't exist and those that do priced themselves out of the market. Aerostar, through necessity had to use USA instruments made on a budget, many non certified and poor quality. These do fail on a regular basis, they are just not made to withstand the harsh environment demanded by the YAK. The clever part was calling it YAK 52 W (west) making it sound like specially made for the USA market to "higher and familiar" presentation/ quality. ++++++++++++++ FWIW, the UMA tach generators which are used on the 52TW/W have exhibited oil leaks and failures much more frequently that any Russian tach generator. As an example, I have replace the UMA tach generator on a 52TW 3 times for precisely the problems I mentioned. Dennis ________________________________ Message 2 _____________________________________ Time: 12:32:56 AM PST US From: "Mark Jefferies" Subject: Yak-List: :>)) --> Yak-List message posted by: "Mark Jefferies" :>))) The world does not yet understand !!!! ++++++++++++++++ P.S. My price estimate is based on what I paid to have them shipped from Russia... which is an experience I would recommend that no one here tries to duplicate. It was a real learning experience. ________________________________ Message 3 _____________________________________ Time: 04:53:52 AM PST US From: "aaron marshall" Subject: Re: Yak-List: M14P Tach Generator / Yak 50 Fuel Sender (not processed: message from valid local sender) --> Yak-List message posted by: "aaron marshall" I have a 52TW and I have had the UMA generator apart twice. It was found loose upon initial assembly when it came off the boat. We tightened it and re-installed it. It loosesned up again within 10 hours. I think I fixed it for good now though as It has not loosened up in the last 45 hours. I suggest if you buy one you remove the tiny screws from around the outside of the barrel and open the generator housing. Make note of which color wires go where (ther are 3) and de-solder them from the little board. This will allow you to get a socket in the case half to remove the flat nut that holds the plug to the housing (this is what kept loosenign up on mine). Put some high strength Lock-Tight on the flat nut and tighten fimly. re-solder the 3 wires and reassemble the case. Put lock-tight on the 4 tiny screws that hold the case canister to the generator assembly as well as these were also loosening from vibration and oil penetration. I'll report back to the list if I find this fails and it loosens up again. UMA has been good to work with. They send parts out immediately and are very reasonable. Aaron N343DC YAK 52TW ________________________________ Message 4 _____________________________________ Time: 05:05:48 AM PST US From: "aaron marshall" Subject: Re: Yak-List: Oil (not processed: message from valid local sender) --> Yak-List message posted by: "aaron marshall" Regarding heat pads and warmup. I have studied the manuals and examined the components under the cowling carefully and I odn't understand why if the oil in the tank is 160 degrees as well as the sump (fronm pre-heat pads on all night), and the rest of the engine and oil is at least 60 degrees in a heated hangar, it still takes 7-10 minutes to see 104 on the oil temp gage, at first flight. It appears that the oil temp probe is in the assembly connected the large filter screen cannister on the botton of the firewall (52TW). It appears that this location would get hot oil from the tank right away. Is this not where the temp probes are? Or is this the last place to get oil and therefore getting the cold cooler and system oil at first? Aaron N343DC YAK 53TW ________________________________ Message 5 _____________________________________ Time: 06:08:43 AM PST US From: "Steve Dalton" Subject: Yak-List: RE: Yak-List Digest: 19 Msgs - 03/11/05 --> Yak-List message posted by: "Steve Dalton" --> Yak-List message posted by: "A. Dennis Savarese" FWIW, the UMA tach generators which are used on the 52TW/W have exhibited oil leaks and failures much more frequently that any Russian tach generator. As an example, I have replace the UMA tach generator on a 52TW 3 times for precisely the problems I mentioned. Dennis Dennis, I found that replacing the $0.05 O-ring on the Tach drive (which takes 10 minutes to do) will stop the oil leak. Mine has been dry now for over 100 hrs. I *think* that if you are not careful you can slightly tear/twist the oil ring during installation and it will soon leak again. Cheers, Steve Dalton ________________________________ Message 6 _____________________________________ Time: 06:38:35 PM PST US From: "cpayne@joimail.com" Subject: Yak-List: SNF 60 Cancelled --> Yak-List message posted by: "cpayne@joimail.com" Arrgggh, just when I had everything dialed in, they canceled the race. My inside connections tell me that someone in SNF air ops whoosed out because of "liability", but who knows for sure. Anyhow, I'm left with a big bad boot and no butt to kick! Heh, what's under YOUR cowl?? Craig Payne ________________________________ Message 7 _____________________________________ Time: 06:38:43 PM PST US From: "cpayne@joimail.com" Subject: Yak-List: Re: UMA Tach --> Yak-List message posted by: "cpayne@joimail.com" Yes, an O-ring helps a lot, been there, done that. Now I have the vastly superior (and expensive) Horizon tach...sooo, my old rig is available, with spare pins and the like. Like Steve Dalton says, works well when it works. The arguement for the digital tach is that it allows precise settings and monitoring of RPM, great for tuning and evaluating engine mods. Craig Payne ________________________________ Message 8 _____________________________________ Time: 08:42:32 PM PST US From: DaBear Subject: Re: Yak-List: Re: UMA Tach --> Yak-List message posted by: DaBear So I'll add my .02cents I like the Horizon tach (off the p-lead). It tells me instantly if I lost a mag, or failed to switch back to both. I've not lost a mag, however, knowing that if it occurs, I'll know when it happens is worth the extra cost and the fact that the readings move (up and down about 8rpm). Al DeVere payne@joimail.com wrote: >--> Yak-List message posted by: "cpayne@joimail.com" > >Yes, an O-ring helps a lot, been there, done that. Now I >have the vastly superior (and expensive) Horizon >tach...sooo, my old rig is available, with spare pins and >the like. Like Steve Dalton says, works well when it works. > >The arguement for the digital tach is that it allows precise >settings and monitoring of RPM, great for tuning and >evaluating engine mods. > >Craig Payne > > > >