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Went to the Pond Today
And carefully video recorded everything on my spy glasses. I got home, pulled out the card and......
NOTHING!
Other than that, here's the report:
I don't like the curved turn fin in the Atlas. If it's not perfectly oriented. it will either lift up or dig in the right sponson. I'm going to take the bend out of it for the next trials. I need to toy with CG and strut angle/depth, but it's really close. The atlas hauls buns on 2S with the Y531 plastic prop, and even does OK with the 27mm plastic prop (thinned and sharpened) in the kit. The motor was a bit warm at 125° with the Y531. I think the optimum prop would be a de-tongued X432 reduced in diameter to 30mm, Motor temps with the 27mm prop were slightly warm to the touch.
It gets up on plane instantly with either prop I tested and corners like a dream, but it does bleed off some speed too. The 1/32 wire drive worked flawlessly and there wasn't a drop of water in the hull after running.
All in all a success I would say.
And carefully video recorded everything on my spy glasses. I got home, pulled out the card and......
NOTHING!
Other than that, here's the report:
I don't like the curved turn fin in the Atlas. If it's not perfectly oriented. it will either lift up or dig in the right sponson. I'm going to take the bend out of it for the next trials. I need to toy with CG and strut angle/depth, but it's really close. The atlas hauls buns on 2S with the Y531 plastic prop, and even does OK with the 27mm plastic prop (thinned and sharpened) in the kit. The motor was a bit warm at 125° with the Y531. I think the optimum prop would be a de-tongued X432 reduced in diameter to 30mm, Motor temps with the 27mm prop were slightly warm to the touch.
It gets up on plane instantly with either prop I tested and corners like a dream, but it does bleed off some speed too. The 1/32 wire drive worked flawlessly and there wasn't a drop of water in the hull after running.
All in all a success I would say.
The FDM one (and only the upper 50% of the engine) is 21 grams. My guess that a proper-sized DLP engine, cut down to the the visible components would be an ounce (28 grams) or less.
), some final clear coating, and final assembly/detailing to be completed. The Atlas Prototype #1 has already run with a couple of cheap plastic props and while it was more than satisfactory with those, I think I've narrowed the final choices to an Octura X430 de-tongued, or an X632 reduced to 30mm and de-tongued. I may start with an X431P (plastic) that is de-tongued and reduced in diameter.
. I plan to go to the pond on Saturday, May 11th and hopefully will video it with all of the aforementioned props.
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