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Sterling 48

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Old 09-13-2012, 09:03 PM
  #226
All Day Dan
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Default RE: Sterling 48

RCU has finally cleaned up their site and now I can get to it on a regular basis. I did nothing to AVG to change any thing so the problem was RCU's.

I got the 1 ½ inch prop from Dumas that I needed to complete the counter rotating pair. A new prop shaft will be used to replace the one with the gouges. Hopefully, that will do the trick, along with the new strut, to stop that screeching noise from the left drive group. You can see how much smaller the prop is compared to the 1 ¾ inch prop. Maybe it will help the performance and run time. I also included a shot of the old Ace cycler I use to monitor my NiCad’s health. Since I don’t run the boats that much, I cycle the battery pack for the R/C once a month. When they loose 20% of their original capacity they get replaced or are about 2 ½ years old, whichever happens first. Check out the difference in drop angle between the old strut and new one. Dan.
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Old 09-13-2012, 09:28 PM
  #227
Kmot
 
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Even though it may seem 'counter-intuitive', many times I have seen that going to a smaller prop improves performance significantly. I'm sure you know Dan, but for those that may not, prop size is like the gearing on a car. Too tall a gear ratio, and the motor lugs, overheats, and speed suffers. (It's an inverse relationship. 2.56:1 is 'taller' than 4.11:1) Going to a smaller prop is like going to a lower ratio gear in a car. Of course, it's possible to go to a too small prop as well. And go nowhere.

There is a sweet spot that will be the ideal situation of speed, run time, motor temps. And it really helps if you have a box full of different props to test. That's an expensive proposition when using bronze or brass props. Thankfully, there are inexpensive plastic props that can be found, used for testing, and then a suitable bronze prop substituted for it when the sweet spot is found.
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Old 09-14-2012, 07:23 PM
  #228
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Default RE: Sterling 48

Tom, I took the Corvette up to the lake to give the new configuration a try. First, it was nice and toasty, 103 to be exact. The 1 ½ props worked just great. Performance was a little better and the run time went from a little over 10 minutes to about 14. The epoxied strut joint held as expected but is definitely not removable without a lot of grinding on the mount base. I’m going to be busy for a while so it will be a long time before I get a chance to get up there again. I’ll certainly check the weather prediction before I plan on it. I will send you a PM. Dan.
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Old 09-14-2012, 09:18 PM
  #229
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Default RE: Sterling 48

It was 107° a few miles north of you. [:@]

I hope this heat breaks for the season soon. I do not go out and play in this stuff anymore.

Good to hear that the new props improved your performance!
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Old 07-21-2017, 02:47 PM
  #230
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Just saw this thread, what a great job. Congrats on a wonderful boat, that I'm sure you'll get all sorted out. Sometimes that half the fun right?
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Old 07-21-2017, 04:45 PM
  #231
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Thanks for the compliment. I got everything sorted out eventually. Dan.
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Old 07-29-2017, 01:15 PM
  #232
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I wish I could find the patience to do something like this. I probably have over a dozen nitro boats, but have never built a single one. I always buy them already built. Sometimes I'll have to do the running hardware, but that's it. I'm recently retired after 37 years of pipefitting, so maybe the time is now. What would you suggest as a starter build? I'm pretty handy, and have built several tube HiFi amplifiers, so I have the tools and stuff, just have never done it? I really admire your work, it must be very satisfying.
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Old 07-29-2017, 07:16 PM
  #233
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Thanks for all the compliments Jay. I've been building models since 1945-46 and I am not going to stop just because some guy is making ARFs somewhere. As I tell everyone who is in to ARFs and is dropping out, 95% of the fun is building them. They don't believe me even as they try to sell off all their stuff after a few years. I was an electrical engineer in the aerospace industry for 40 years and I'm still building. I really do not have much experience with boats. I think Dumas is still making kits, maybe some European companies too. Start out with single drive and be sure to get a radio on 2.4. Sorry, I can't help you any more. Dan.
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Old 08-02-2017, 12:02 PM
  #234
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Yes there are several Dumas kits good for the beginner. Harbor Models has a good selection of quick build and advanced kits from several manufacturers. Many have difficulty level ratings on the site, and they're always good at providing advice on what to buy based on your skill and interest.
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