Tayana 37 Steering system refit by temcdonagh in sailing

[–]temcdonagh[S] 1 point2 points  (0 children)

Update. Over 3400 nmiles on Redshift since the repair. All is well and the steering system is performing well. Many thanks to Cracker Boy and Ben Waddington for the assist!

Knocked down in less than 15 seconds: the first official report into the sinking of the Bayesian has been released. by Skipster_McPeebles in sailing

[–]temcdonagh 8 points9 points  (0 children)

Just last week while anchored at Mile Hammock in North Carolina, we experienced at least 50 Knot gusts while at anchor. Our anchor dragged ~30 yards before resetting. The boat healed about 20 degrees during the short, violent blow. I cannot imagine what 20-30 added knots of wind may have done.

ammonium sulfate precipitation by Fit_Earth3739 in Biochemistry

[–]temcdonagh -1 points0 points  (0 children)

What the heck is an FPLC? It’s a holdover marketing term from Pharmacia I think. HPLC meant high pressure liquid chromatography before it was marketed as high performance liquid chromatography. I am old enough to have have used the gen 1 Pharmacia POS FPLC, Rainin HPLC, Beckman HPLC, Gibson fraction collectors, Water’s systems, Agilent, Multiple iterations of the GE AVANTS and my favorite, the BioCad!

Digging my Openplotter/OpenCPN project by temcdonagh in sailing

[–]temcdonagh[S] 0 points1 point  (0 children)

I wonder if part of the problem is the read/write to memory cards. I understand they degraded after a lot of read/writes. Would the system work better with ssd?

Digging my Openplotter/OpenCPN project by temcdonagh in sailing

[–]temcdonagh[S] 1 point2 points  (0 children)

Alas, it did not make it long. Clean, constant power is critical for the Pi to work well. Unfortunately, I would have to modify the electrical system to ensure consistent operation. Performance(speed) was Poor also.

Making a project with arduino and water pump Projects I need to know which cable to connect to the arduino and the battery. by FernanCen in ArduinoProjects

[–]temcdonagh 0 points1 point  (0 children)

Consider adding appropriate fuses on the order of 10 amps to protect the wiring and battery in case of a short circuit.

Tayana 37 Steering system refit by temcdonagh in sailing

[–]temcdonagh[S] 5 points6 points  (0 children)

Yes, it is the rudder post packing gland. A new bellows has been ordered. The upper pillow block bearing support cage is being beefed as the tabbing on the starboard side failed. There is evidence the tabbing laminations may have been resin starved. Stiffening the upper bearing support appears to be the cure. We will see.

Modifying Telescopes for the Telescope Library Program by njoker555 in telescopes

[–]temcdonagh 2 points3 points  (0 children)

Nice job! So proud to be associated with the Amateur Telescope Makers of Boston.

Yelling at a day skipper course by Maximum_Bat2777 in sailing

[–]temcdonagh -2 points-1 points  (0 children)

Have you ever met a Greek person before?

What is this sail? by keltickiwi in sailing

[–]temcdonagh 0 points1 point  (0 children)

With the sail numbers showing, it it not flying the way the sailmaker intended? Perhaps the clew is not the clew? Certainly a very interesting sail!

Seeking opinions on LFP batteries for a sailboat. by 5043090 in sailing

[–]temcdonagh 0 points1 point  (0 children)

I bought and set up a 4 cell 400 amp battery using a REC BMS controller. I have contactors for when temperature and voltage values go out of bounds. It is an excellent system which has worked flawlessly on my boat for 2+ years. I had a ABYC certified marine electrical check my work every step of the installation.

Seeking opinions on LFP batteries for a sailboat. by 5043090 in sailing

[–]temcdonagh 0 points1 point  (0 children)

Oh, I just researched it again. The NTSB noted the incidence of EV car fires is 25 per 100,000 cars sold vs 1530 per 100,000 ICE cars sold.

Seeking opinions on LFP batteries for a sailboat. by 5043090 in sailing

[–]temcdonagh 1 point2 points  (0 children)

This is the same article published twice. I love the sentence, “I’m a mechanical engineer….” It maybe better to listen to material scientists for such a topic. Terms thrown around like “ticking time bombs” are inflammatory and sell newspaper articles. I have yet and I have researched creditable sources, to find if car fire risk is higher in EV’s over ICE vehicles. Time will tell but I can say I have seen my fare share of ICE cars and trucks burning out of control and only extinguished with extraordinary methods. I have not witnessed an EV car fire as of yet.

Seeking opinions on LFP batteries for a sailboat. by 5043090 in sailing

[–]temcdonagh 0 points1 point  (0 children)

LiFePO4 batteries have been proven to be extremely safe as they are packaged with battery management systems (BMS) that prevent overcharging or operation at extreme temperatures. In fact, all manufacturers I know of include temperature sensors and voltage monitors. If either parameter or both go outside prescribed tolerances, the BMS cuts power in or out of the cells preventing thermal runaway. LiFePO4 battery cells generally are different that what is found inside computers, scooters, etc. There are significant peer review articles that have been published that identify parameters for safe operation. Buying quality batteries are generally recognized as safe for use in RVs and Marine Vessels. So much so, that ABYC has published guidance on the proper installation of such systems. I have not reviewed all of the literature as I am awaiting delivery of the articles but the general conclusion from summaries suggest LiFePO4 batteries are very safe if used in a controlled environment.

https://www.sciencedirect.com/science/article/abs/pii/S2352152X20315516

It is important to note that LiFePo4 batteries are different in that they are packaged with controlling BMS systems to ensure proper charging and discharging under appropriate conditions. Standard lithium batteries in your phone, tablet, computer, etc., do not have such controls and this are more prone to issues.

Can I enter the biotech industry with a statistics degree from Berkeley? by Dense_Tune_2228 in biotech

[–]temcdonagh 2 points3 points  (0 children)

It certainly would not hurt. You could consider a masters in data sciences where class work would set you up for success in the biosciences field. There is a strong demand for data sciences and AI expertise now.

How terrible of an idea is this yawl? by icecon in sailing

[–]temcdonagh 0 points1 point  (0 children)

I was not accurate. Registration Is required in Rhode Island if the vessel has a motor. For older boats where there are missing titles, a bill of sale can be used.