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    Graupner Hertha Jeep
    by Cashrc ๐Ÿ‡บ๐Ÿ‡ธ ( Warrant Officer)
    ๐Ÿ“ฃ










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    11 Posts 20 Comments 0 Photos 49 Likes
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    ๐Ÿ“ Maiden!!!!
    30 days ago by Cashrc ( Warrant Officer)
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    Well, she splashed today, and she ran well. This hull handles very well and the boat looks good on the water. Only caveat is the motor I used ran a little hotter than I would like, itโ€™s a long can 400 with the flux ring removed, and with think itโ€™s wound a little hot for direct drive. We also think that removing the flux ring (necessary to get the motor to fit stock mount) altered the timing a bit, allowing more kv but also more heat. So, I swapped the stock unit back in place, weโ€™lol see how that goes. However, nothing smoked, it ran well and came back dry inside every time, and I like her..a lot!! Good show Graupner/SJ!
    Maiden run Graupner/SJ Hertha Jeep
    โ–ถ๏ธ
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    ๐Ÿ’ฌ Re: Maiden!!!!
    30 days ago by jbkiwi ( Captain)
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    Runs real nice, you put that together pretty quickly! How about a 2s 2200MAh (or even 1800 MAh) as that would give you a good run time and far less weight. I use them on my twin 540 45T motors with 30mm props, and I can get over an hour of mucking about with the Seaplane tender, which weighs about 6LBs. You could maybe go up to a 55T motor? - what wind is your motor, seems pretty rapid? To reduce your torque roll you could always reduce your pitch or use a smaller prop to avoid adding more weight.
    JB

    motors
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    ๐Ÿ’ฌ Re: Maiden!!!!
    30 days ago by Martin555 ( Commodore)
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    Hi Cash,
    She runs very well, and answers the helm very quickly.
    very manoeuvrable.
    Well done.

    Martin555.
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    ๐Ÿ’ฌ Re: Maiden!!!!
    29 days ago by Rookysailor ( Lieutenant)
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    Nice video of a nice boat Cash,love the Graupner craft, have a few myself, love sailing the Pegasus III, which Iv'e had for many years.
    Yours is a pretty quick craft, certainly faster than that red thing, one option you could try, is to replace your 400 with a brushless motor about 1000 kv, as it's an outrunner, you wouldn't need to worry about cooling๐Ÿ˜.

    Cheers, Peter (Rooky)
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    ๐Ÿ’ฌ Re: Maiden!!!!
    29 days ago by Cashrc ( Warrant Officer)
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    I have no idea what the wind is on the motor, itโ€™s a long can 380-400 class motor, some call that a 480, but it has the 2.3 mm shaft. Methinks itโ€™s a hot wind for a drill, or maybe a gear drive for aircraft. Iโ€™ve seen videos of the same boat with the stock kit motor, it goes pretty good, and I have a Sport Tuned Tamiya 380 coming. I like this boat enough that sheโ€™s a keeper, Iโ€™ll tinker with her till I get everything where I want it.

    boat
    Tamiya 380
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    ๐Ÿ’ฌ Re: Maiden!!!!
    29 days ago by Cashrc ( Warrant Officer)
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    Just so you know, brushless might be an option in the future...๐Ÿ˜
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    ๐Ÿ“ Just about done
    1 month ago by Cashrc ( Warrant Officer)
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    Well, this is pretty much how sheโ€™ll look when sheโ€™s splashed. I might have a minor detail or two to do, but right now all she needs is esc, receiver and a battery, and thereโ€™s a access panel in the aft lower bulkhead that I need to fit and tape on. It allows access to the rudder arm. Hopefully Iโ€™ll have some maiden shots next week.
    Cash
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    ๐Ÿ’ฌ Re: Just about done
    1 month ago by Martin555 ( Commodore)
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    Nice job Cash,
    Looking forward to seeing the video.

    Martin555.
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    ๐Ÿ“ Dang it!!!!!
    1 month ago by Cashrc ( Warrant Officer)
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    Hi yโ€™all. Been a bit since I posted anything on the Jeep. Did a test run on the motor and shaft, sounded a bit โ€œbuzzyโ€ at mid throttle but smoother out in low and max power. Then, I installed the prop, and tested again..this time, I thought she was going to vibrate to pieces, and the amps went wayyy up. I tried reinstalling the motor, checked my coupling motor and shaft alignment, all looked good. Then, when I had it a low throttle, barely โ€œticking overโ€, I noticed the prop was a little..wobbly. On close inspection I found that the shaft was slightly bent right where the threaded portion ended, causing the aft end of the prop to rotate out of round by about 2mm. Now, I donโ€™t have the tools to really straighten a shaft this size and get it dead on, so I looked the shaft over, found the bend, put it in my vise and gently bent it in the opposite direction. I got lucky as subsequent tests showed I was on the right track. Much quieter, very little vibration and the amp draw diminished dramatically. But, itโ€™s still not right. Usable, but not dead straight. I found a vendor on eBay with 3mm model boat shafts that are threaded, so Iโ€™m waiting for that to arrive. Once itโ€™s here, Iโ€™ll cut it to size and retest.
    I did get the upper railing made up and installed, did a combo of soldering the easy joints and caโ€™d the rest. I also got the towing bar and gear built, painted and installed.

    model boat shafts
    gear
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    ๐Ÿ’ฌ Re: Dang it!!!!!
    1 month ago by RNinMunich ( Fleet Admiral)
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    Bad luck Cash ๐Ÿค”
    As I read the second sentence 'shaft whip' instantly came to mind!
    I had a similar experience with my first attempt to make a shaft for my fish cutter restoration / conversion. Second attempt was a 'wobbly prop' cos I couldn't get the damn thread concentric on the shaft. Martin (Westquay) came to my rescue and made me a decent straight shaft and tube assembly ๐Ÿ˜Š
    Cheers, Doug ๐Ÿ˜Ž
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    ๐Ÿ’ฌ Re: Dang it!!!!!
    1 month ago by jbkiwi ( Captain)
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    Hi Cash, a good way to straighten a shaft to a reasonable degree (If you haven't done this already) is to find a flat surface (such as a bench top etc) place a torch or strong light at the back and roll the shaft on the bench. Look where the light shines through underneath and hold the shaft in that position. Place the shaft on a flat piece of hard wood and tap along the high spot gently with a plastic hammer (or similar a few times (not just at one point, - and don't use a steel hammer!).
    Try rolling again in the same spot on your bench and check for light, and keep repeating as often as necessary. It might take a while and a bit of chasing, but it's a lot more gentle than putting it in a vice, and you won't over bend it if you are careful. Needs patience!
    JB

    hammer
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    ๐Ÿ“ Just a bit more
    2 months ago by Cashrc ( Warrant Officer)
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    Had a little time to work today. I left work early today to pick up my upper dentures, which broke in half a few days ago as I munched on a pickle spear๐Ÿ˜  Iโ€™ve had bad gums since my late 20s, have had a full set of dentures for three years, the uppers are over ten. Anyway, I had them repaired, picked them up and went home. Only pain I felt was in my wallet....๐Ÿคฃ
    Soooo..I started detailing the mast. Went for the airbrush first, but Iโ€™m still new to it, and the paint I was using came out a little wetter and runnier than I liked, so I Tamiya rattle canned the parts, let them dry and installed what I could before dinner.
    I have a few more to do then itโ€™s...wait for it....railings.๐Ÿ˜ฎ
    Cash

    uppers
    airbrush
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    ๐Ÿ’ฌ Re: Just a bit more
    2 months ago by Martin555 ( Commodore)
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    Nice work, keep it up.

    Martin555.
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    ๐Ÿ’ฌ Re: Just a bit more
    2 months ago by figtree7nts ( Rear Admiral)
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    Hi Cash,

    It looks really good!๐Ÿ‘
    She has good details!

    Cheers, Ed
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    ๐Ÿ’ฌ Re: Just a bit more
    2 months ago by Nerys ( Lieutenant Commander)
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    Interesting little boat. I like!

    boat
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    ๐Ÿ’ฌ Re: Just a bit more
    1 month ago by MouldBuilder ( Sub-Lieutenant)
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    Looks really nice.
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    ๐Ÿ“ Had to do it!!
    2 months ago by Cashrc ( Warrant Officer)
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    So, tonight I finished the windows, decided to use my own stock of clear for the forward and side cabin windows, used the kit smoked windows in the skylights and aft cabin and door. I kept looking at that green aft deck, and decided to โ€œmake it rightโ€ i.e match the box art as close as my skills would allow. So..I masked her off and painted her, and let the paint dry while I glazed. Came out ok๐Ÿ˜€

    kit
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    ๐Ÿ“ Windows and frames
    2 months ago by Cashrc ( Warrant Officer)
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    Nothing earth shaking tonight, I installed the skylights in the cabin roof, and the window frames in the cabin proper. I didnโ€™t paint the frames, theyโ€™re molded in with, some guys paint them, some donโ€™t, I elected not to. The windows supplied with the kit are tinted and laser cut, but still have to be trimmed as they are a mite oversized.
    Going to see how they fit in the window frames, if I donโ€™t like how the fit Iโ€™ll cut windows from clear and make my life a little easier to boot.
    By the way, I use RC56 to do all my glazing, itโ€™s designed for plastic canopies and dries crystal clear. Itโ€™s not waterproof but it is water resistant, had several planes get pretty damp flying in misty weather never had the glue let go.

    window frames
    kit
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    ๐Ÿ“ More paint
    2 months ago by Cashrc ( Warrant Officer)
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    So, my lovely spouse and I went to a function at our Church Friday night..it was a lot of fun, called a โ€œGetawayโ€..itโ€™s primary function was to have couples young and old to rediscover each other, both spiritually and secularly. Anyway, by Friday Iโ€™m worn out, work takes its toll. Iโ€™m paid well, but I think some of my soul is stripped away each week. Long story short, I told her if I go to this shindig Iโ€™ll probably lay off service Sunday. When Teresa and Grace left for church, I went out and did a little painting. Thatโ€™s the way the day went for me..paint a bit, go get groceries..paint a bit, do the dishes..paint a bit, watch the Cowboys. I got a bit done, however, I just realized the aft part of the deck is mostly white with green panels. I may or may not โ€œfixโ€ that, as the deck and hull are joined from the factory, and I think I have stock in masking tape corporations by now.
    Came out pretty good, did a little touch up and I need to do a bit more, but itโ€™s looks ok. Next up is trimming and detailing fittings for the superstructure, windows, add rudder linkage, then glue in the aft deck insert and start to finish her up.
    BTW, thanks to all who have posted so far, I appreciate the kind remarks and input!
    Cash
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    ๐Ÿ’ฌ Re: More paint
    2 months ago by Martin555 ( Commodore)
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    A little bit at a time is always the way to go, otherwise it starts to feel more like a job than a hobby.
    Keep up the good work.

    Martin555.
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    ๐Ÿ“ Paint
    2 months ago by Cashrc ( Warrant Officer)
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    Did some painting today and added a..I donโ€™t know what youโ€™d call it, but itโ€™s a rail that runs around the deck just inboard by 12 mm or so. Iโ€™m using some Home Depot rattle can white and Tamiya orange and green, with some leftover appliance epoxy for the hull below the waterline. Going to try to do a bit more tomorrow.
    Cash
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    ๐Ÿ’ฌ Re: Paint
    2 months ago by Martin555 ( Commodore)
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    Hi Cashrc,
    Nice, as soon as you start getting paint on it seems to give you the feeling that you are actually starting to get somewhere.
    Well done.

    Martin555.
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    ๐Ÿ’ฌ Re: Paint
    2 months ago by MouldBuilder ( Sub-Lieutenant)
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    Looking very good. I must admit that the painting is my least favourite task. I just cannot drum up enough patience. The build looks super. Look forward to seeing it fully painted.๐Ÿ‘
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    ๐Ÿ“ Motor mount and keel
    2 months ago by Cashrc ( Warrant Officer)
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    I decided to do a bit this afternoon, got the motor mount/stuffing tube assembly completed and installed. The stern tube is glued to the mount then goes thru the bottom of the hull and out the rear of the keel. I did a quick lash up to check fit, and started to tack the keel on, when I found the keel was twisted to the point the boat would have a permanent trim to port. I was able to get the keel off, thought I could tweak it straight, but found there was a molding error that could only be fixed by cutting the lower part of the keel. This allowed me to assemble everything straight, then I glued the cut piece back on and filled the cut with scrap plastic and filler, then sanded it smooth. Before I shut down for the day, I gave the superstructure a light coat of primer so I could better see what I needed to sand or fill on my repair on the fwd window section.

    boat
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    ๐Ÿ“ More done
    2 months ago by Cashrc ( Warrant Officer)
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    Real quick update. I built up the stuffing tube and rudder post. Both are made from 6mm brass tube in which you install flanged 6x3 mm bushings. Theyโ€™re a tight fit, but I soldered themin just in case. I installed the rudder post tube into the hull, followed by the ply bushings that are glued in place over the tube and against the hull, then slathered epoxy over the joint. I also started test fitting some of the motor mount parts to get an idea how this will all fit.
    Hopefully Iโ€™ll get more done this weekend, once the power system is in, I can concentrate on finishing up the upper superstructure, then, itโ€™s time to paint and detail. Thinking about either airbrushing her or Tamiya rattle can. The Tamiya paints arenโ€™t cheap, but they cover well and dry fast.

    rudder post tube
    paints
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    ๐Ÿ’ฌ Re: More done
    2 months ago by RNinMunich ( Fleet Admiral)
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    Hi Cash,
    Some (43) pics of the big'un here-
    https://www.marinetraffic.com/de/ais/details/ships/211290190
    Cheers, Doug ๐Ÿ˜Ž
    https://www.marinetraffic.com/de/ais/details/ships/211290190
    ๐Ÿ”—
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    ๐Ÿ’ฌ Re: More done
    2 months ago by Cashrc ( Warrant Officer)
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    Thanks Doug, I hope I can do her justice. Like you, I really like the Tamiya rattle cans, I was going to use my airbrush but the Tamiya paints are working well right now. Have you ever tried the Tamiya acrylic for airbrushing? Iโ€™m thinking about giving that a go sometime.
    Cash

    airbrush
    rattle cans
    paints
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