Thumper

Sold to a MooneySpace member!

I am selling my Robotow that I have used with my M20F and M20K. Works great, and is in great condition with normal wear and tear. $750.00. Ken 301-524-3675 kennethrthompson@hotmail.com

Thanks for the replies. I do have an engine monitor, MVP-50P and all EGT's were pretty much in line. I have mag-out indications on the engine monitor and the mag-out never annunciated. I am starting to think that it really is finicky to cold outside air temperature starts. FBCK, how long do you prime and where is your throttle set when priming and when cranking? I prime and crank with the throttle 1" open, it seems to like it there except for these cold temperature starts that I have not figured out yet. Thanks, Ken

This is the first winter with my 1980 231K. My last few starts were the first cold outside air temperature starts. I preheated the motor so that Oil Temp and CHT’s were well above 80 degrees, the outside air temperatures were in the 30 degree range +/-. After a five second fuel prime it fires up every time on the first start attempt, but it does not want to stay running with cold outside air temperatures. It wants to die and I have to milk the fuel prime to keep it running or turn on the Low Boost pump. I can keep it running with the prime or boost, but it does not run smooth and after turning off the Low Boost or Fuel Prime it still wants to die. With all pumps off, I jockey the throttle to try and keep it alive and with throttle application it wants to sputter and die. After a few consecutive engine starts, and 10 to 15 minutes of this, I finally get it running smooth enough to taxi to the Mooney Service Center at my home field. For the taxi over I have to keep the RPM’s in the sweet spot of 1200 RPM and ride the brakes, milking the prime from time to time to keep er alive, (This is after a call to this MSC two days prior about these starts and they just said the K’s don’t like cold weather starts). The start is not the problem, it is the rough running engine after engine start. So when I get over to the MSC, I start it up to show them the finicky cold outside air temperature starts and it fires right up with nothing abnormal about the start, “Could Not Duplicate”. The last few times that I went out to the airport for these cold outside air temperature starts, I would normally be able to get it running smooth after the 3rd, 4th, or 5th start, it would start every time, but it would not run smooth even milking the prime until it would just decide to start normal on later start attempts. The MSC removed the upper and lower cowls and checked everything. The idle was set at 800 RPM and RPM did not rise when placing the Mixture control to Idle Cutoff. So, they set the idle RPM to 730 RPM and now the RPM will rise to 760 RPM as the Mixture is pulled toward Idle Cutoff. The engine driven fuel pump is a fresh overhauled pump with only 15 hours on it, replaced it two months ago due to a fuel drip issue. Of course, it started perfectly at the MSC before and after they changed the idle setting, which it tends to do once it gets it’s first good start for the day with cold outside air temperatures. The MSC said they have a few 231K customers and they all have similar issues. I am heading back out to the airport tonight after letting it sit for about 8 hours to see if it still has the finicky starts, or if the re-setting of the RPM helped. Has anyone ever experienced this, and/or have any suggestions to prevent these finicky starts? Is a solid 5 second prime too little and the cause of this, should I go for 10 seconds, should I try something else? Thanks! Ken

I just sold the S-Tec. Thought I would just confirm what I learned and what was mentioned above. If the aircraft the S-Tec is going to be installed in to is listed on the original STC, it only requires a new Documentation Package from Cobham for $1,450.00. This S-Tec came out of my M20F and the guy that picked this one up is putting it into an M20J, which is listed on the STC, so he pays $1,450.00 to Cobham and he is good to go. If the aircraft was not on the Original STC, any servo or computer that had a serial number that differs from what is required for the new aircraft, would require sending those components to Cobham for reconfiguring that could total upto $3,500.00. Thanks for everyones input on this thread. Ken

Brett, I must say, that was pretty funny! You took the sting out of me parting with my money on that S-Tec, but just for a few seconds. Thanks for the laugh! Ken

On the question of the STC being transferred to another tail number. I never made any calls on that. I had all of my new avionics removed from my M20F to install in my M20K, and the only thing that I am not using in my new aircraft is the S-TEC, so that is the only thing that I am selling. I came straight to MooneySpace to list it, and plan on listing it on Ebay next week. On the parting-out of the M20F, I sold the aircraft with the panel and avionics removed, with the original 37 year old panel and radios in a box, and the buyer chose to part-it out, since I priced it appropriately. Thanks, Ken

Yes, the aircraft is being salvaged. I sold the aircraft with all of the original avionics, but the guy I sold it to is parting it out. Thanks, Ken

Yes, the aileron and elevator servos are included. It is ready for install in new condition with all of the compnents. It was only in the aircraft for a few months, so technically it is used, and so I am selling it at used prices. I have the STC paperwork, installation instruction, and wire harness. Selling for $5,750.00 plus shipping. Thanks, Ken

I purchased a new S-TEC 30 with Altitude Hold last year for $10,750.00 not including the cost of the install. I had it installed in my 1975, M20F as part of my avionics package/instrument panel upgrade. I flew the aircraft for a few months, (40 hours) with the new avionics pacakage, and the S-TEC 30 with altitude hold, and GPSS steering slaved to my Aspen made flying so much more enjoyable! However, as luck would have it, just a few months after my avionics upgrade I purchased a 1980 M20K. I had all of the new avionics removed from my M20F, and Penn Avionics is currently installing all of the new avionics from my M20F into my M20K, except for the S-TEC 30 with altitude hold. My M20K has a nice autopilot flight director system already in it, so I am selling the S-TEC 30 with altitude hold. I have attached a picture of my old M20F with the S-TEC with altitude hold in the panel. If anyone is interested please let me know. The S-TEC is in perfect condition! Thanks, Ken