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More mods, attempt at testing


I finished all my mods yesterday. What a BUSY, busy day! I can't believe I accomplished what I was able to do in just one day. My goal was to add some additional structure to the prop strut to stop it from vibrating, add a bushing half way down the shaft to stop it from vibrating, to lower my seat down to the deck, and to make a new mount for the outriggers (my old mount used the seat frame, and this is now cut off to lower the seat). I wanted to get the work finished and get out to the lake to test it all because I am out of town for the weekend and wanted to take advantage of the good weather.

I finished all my work by 4:00 pm. We were enjoying Calgary's first stellar spring day with high temperatures nearing 29 degrees C and no clouds in sight. But as luck would have it, by the time I got to the lake the wind started howling and the lake was covered with whitecaps. Everything I made seemed to work fine, but measuring speed and power was useless because of the waves. I was getting soaked and blown all over the place.

I hope to test these mods again next week, but even in the waves and wind, she didn't seem appreciably faster.

This prop strut brace is a 2" wide strip of aluminum that is fared to a taper on both sides. It wraps around the hull and is screwed to the main strut about half-way down. I also lowered the prop an additional 2" This was enough additional support to keep the prop from vibrating while spinning in the air. I know that I am adding some drag, but for now, I am looking for a large step in speed. When I find it, then I'll know what the culprit was and I can back-track and re-work things to refine it.


I added this nylon spherical rod end that I had. The 3/8" shaft fit perfectly through the ball. This did a great job in stopping the shaft from vibrating. It is located just high enough that it should be above the water line, so it shouldn't contribute to drag. However, in the wind, waves and chop from my test yesterday, it was definitely getting wet.

Note how aggressive the new seat position looks! Very low and mean. The reason for lowering the seat was to lower my center of gravity to make balancing on the center hull easier. During my brief test, the position felt really good - about the same position that I use on my M5 recumbent training bike, but I have no idea of it's effect on staying balanced as I was getting tossed around quite a bit.

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8 Responses to “More mods, attempt at testing”

  1. # Anonymous Anonymous

    If the small chain gear is below deck and the drive shaft run straight out the back have it strong enough to be self supporting after the end of the stern. All you you could have in the water is the hull, the the drive shaft, the prop, and the rudder.
    But I would try to make a system so that when you lean and dip the left or right float in the water you could also turn; that could get rid of the rudder.  

  2. # Anonymous Dr. Leslie Brown

    Hi,

    I've been regularly following your blog/newsletter...

    Wonderful to see you're always so motivated! You're making amazing progress... where DO you find the time???

    Les.  

  3. # Blogger Fairfield

    created. It is a work in progress. I have had a terrible time finding documentation on formatting for SSRS so as I came across tid bits I added it to my document.



    1. Right click the text box and choose Properties

    2. Click the Format tab

    3. Click the elipse button next to the Format Code: text box

    4. Click the radio button to select Standard

    5. Highlight Date in the standard pane

    6. Choose the date format



    Or you can specify a specific format in the custom box using d as day, M as month and y as year

    M/dd/yyyy  

  4. # Blogger Fairfield

    Hi Greg,
    It’s exciting to watch you overcome your obstacles as they present themselves. My observations are not as any kind of expert but just thinking. I’ve spent part of my life around aircraft and when I look at your pictures I can see what appears to be extra sources of drag.
    For example the angled drive shaft. It is round and spinning. That seems like it might cause a lot of turbulence. What if you enclosed it in a teardrop shaped container?
    The other thing from the pictures is abrupt joints at the top of the prop holder where it meets the hull. I would think that if you could flare this it would also help. When you look at the bottom of the hull it is one smooth surface which probably maintains laminar flow till it meets the protrusions.
    Would it help to angle the prop a bit to make up for torque or p-factor? I once saw a chart about an L-10, the large airliner. It said that a 6 inch pipe that was the same length as the wingspan would have more drag than the entire aircraft. Water is a much thicker medium so every little bit of drag is significant.
    To do rough drag tests could you find a creek or other rapidly flowing source of water and connect your boat to a fixed object with one of those weight spring measuring devices? I don’t know if this could give you any kind of rough sense about what your changes are doing.
    Thanks and good luck,
    Don  

  5. # Anonymous Anonymous

    Hi Greg
    You know that I spent many years on the Glenmore rowing up and down the same waters you are now navigating and I can tell you that at this time of year, the middle of the day is usually crap because of the wind. It starts to blow around 7:30am and doesn't stop until about 6:00pm. The good news is that the pattern tends to stop as you head towards July and then there are many calm days. Best of luck.

    Rob Miller  

  6. # Blogger Adventures of Greg

    Hi Rob: Glad you see you are following! Last year was a total anomaly. I was on the lake for many days in May and it was seldom windy - we even lucked out on record day! I have a feeling that our seasonal norms are back this year. I am wondering about looking for a different lake - possibly something in the mountains with more shelter from wind. Any ideas?

    gk  

  7. # Anonymous Anonymous

    Greg

    The prop still doesn't look like a modern prop. It looks like those used in the early stages of powered flight. Are you designing this using the stuff off the IHPVA website?

    Chris P  

  8. # Blogger Adventures of Greg

    Chris P: I refer to my post from a few days ago where I explained that I am not designing this boat. This is a copy of Rick Willoughby's existing V11 HPB. NONE of this is experimental - it's all been done before by Rick many, many times. I am just trying to achieve the performance numbers that he already has attained.

    http://www.adventuresofgreg.com/HPB/2008/05/bit-faster-but-not-there-yet.html  

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