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    kevinsharpe
    Member Stats
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    Member No.#1276
    RegisteredπŸ“…28th Nov 2010
    Last OnlineπŸ“…11th Jan 2021
    CityπŸ“Merseyside
    CountryπŸ‡¬πŸ‡§United Kingdom
    Gender♂️Male
    AgeπŸ‘ΆNot Provided
    PostsπŸ’¬56
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    Recent Activity
    Liked Robbe Smaragd 5 months ago
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    Liked The Vosper 46” RAF Crash Tender Kit By Vintage Model Works 3 years ago
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    Recent Posts
    πŸ“ Robbe Smaragd
    5 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Forgot to mention that the sailing instructions warn not to return the yach to the shore under full sail as severe damage or injury could occur. With such a heavy keel she must really point well when sailing Close hauled to windward.

    Kevin
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    πŸ“ Robbe Smaragd
    5 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Hi. I to have a Robbe Smaragd. Bought her in about 1997 from Bornemouth models. I still have the receipt somewhere in the garage with the plan set. I can remember ordering the kit along with keel, really heavy and the fittings kit. I arranged delivery to my neighbours to prevent my girlfriend having a heart attack!!! Got him from work and neighbour called to say huge box had arrived. We carried up my drive. One at each end like a coffin. I have built her up to the mast stepping stage no soent considerable efforts the paintwork as per the picture on the box and it does look stunning ( in my view). Now retired must finish and sail. Only problem is whem mast is stepped its massively tall. Will try and post some photos. Always remembered when I ordered it I mentioned the Graupner Rubin yacht but the chap said that the Robbe kit was superior and commented that the Graupner rep had admitted that to him.

    Regards
    Kevin
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    πŸ’¬ Re: The Mast
    5 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    The 'white thing' on the mast is a radar reflector. You will also see them on the masts of yachts. The purpose is to create a greater radar signature which is particularly useful on relatively small craft. You can imagine the radar reflection provided by a large tanke or cargo vessel which can easily be seen an a scope. Not so for a small vessel so these devices help amplify the returning radio wave to the scanning vessel. Helps prevent collisions at sea.

    Regards
    Kevin
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    πŸ“ Dual rudder alignment.
    5 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Hi
    Not sure re the car turning wheels point. I am not aware that the inner wheel turns less than the outer on a car. Certainly the outside wheel will rotate faster which is the reason a differential is fitted to the driven set or sets. There is such a thing as wheel camber or toe in or out. If the turning wheels turned at a different rate, this would cause seriou type scrub.

    Regards
    Kevin
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    πŸ“ Electronize speed controllers
    5 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Hi
    I bought the board to prevent battery cross charge and discharge as I saw it advertised on the companies website. In all honesty I had not thought about it before. I remember my brother telling me that on the vessel he was chief engineer on that precautions had to be taken by a distribution panel which managed the power produced by two generators to prevent one pushing power into the other via the distribution board when they were both running i.e. One generator producing more power than the other.

    Regards
    Kevi
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    πŸ“ Electronize speed controllers
    5 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Hi,
    Been busy doing necessary chores. Also been replacing power distribution system for a HMAFV Halifax. Was running on a 12v gel cell, now converted to two 12v sticks of NiMh. I have removed a hunter systems distribution panel and replaced with an Action Electronics power distribution for two buhler motors via two Electronize ESCs. Also using BEC on system as well as power to the loud horn! As I am using two battery packs I have taken the precaution of installing a voltage protection unit to stop one battery charging/discharging into the other, again Action Electronics. Now all working just needs sea trial.
    Now the electronize unit which started the debate. I decided to connect it up before removing the mossfet. Low and behold discovered that there's was a loose connection to a blade fuse unit. Removed and ran well on the bench. I still had a secondary fuse to the battery.
    Got to the lake last Sunday. And while conducting a test before launch discovered that the relays worked but I only had full ahead or full astern available to me, with no neutral. Will replacing the mossfets cure this or is this a symptom of something else. In the meantime I have purchased a soldering pump and an Electronize esc in kit form as New from e bay.

    Regards
    Kevin
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    πŸ“ Electronize speed controllers
    6 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    No need to apologise at all I think your knowledge can help all of us and I welcome a build blog on ESCs.

    Regards
    Kevin
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    πŸ“ Electronize speed controllers
    6 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Sounds to me like your skills are marketable. Have you thought of setting up a little cottage industry for ESCs you could even offer a bespoke service. Would it be possible to supply parts and instructions as a kit even!!!

    Regards
    Kevin
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    πŸ’¬ Re: HMS Repulse.. Refit.
    6 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    In the words of the great man Winston Churchill - "When you're going through hell, keep going"or alternatively KBO.

    Good Luck
    Kevin
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    πŸ“ Electronize speed controllers
    6 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Hi
    Proof of your excellent knowledge and application. How would you rate your esc i.e. What max voltage and Amps could it manage ? How much do you reckon you spent and rough build time?
    Regards
    Kevin
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    πŸ’¬ Re: The New Cabin – Part 6
    6 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Hi Excellent work especially on the fittings. Making a robust cabin structure creates a good foundation for fastening fittings to, otherwise difficult in flimsy structures were parts are easily knocked off. You could consider using two boxes - one for the hull and the other for the superstructure which is what I am going to do for two of my models which have prominent masts.

    Regards
    Kevin
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    πŸ“ Electronize speed controllers
    7 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Hey keep talking about the young folk - I'm 61 this year. You never stop learning the principle that you never stop learning. People with age have an irreplaceable set of skills that they have learned and honed. Their greatest assets are wisdom, skill, knowledge and learnt experience.

    Kevin
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    πŸ“ Help !
    7 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Sorry forgot to add. Esc should work on any channel that the esc is plugged into on your receiver.


    Kevin
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    πŸ“ Help !
    7 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    I purchased an mtronics 25 amp esc recently. Wired it and seemed to work. I then started to install to the model, wiring etc and fastening in then started the set up instructions. When switched on the blue and yellow led light alternately but no red light whatever I do. Tried pressing the button and switching on with button pressed but not powering the motor and only get blue and yellow lighting alternatively. Given up, very disappointed as I don't think these units can be repaired.

    Kevin
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    πŸ’¬ Re: The New Cabin – Part 5
    7 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Quick question.
    What glue are you using to bond the cabin wood parts together? I notice it appears to have a tan colour.

    Regards
    Kevin
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    πŸ“ Electronize speed controllers
    7 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Thinking about your skills have you considered a build blog on this site to advise on building own speed controller with do's and donts with maybe some photos. I notice some article in the Model Boat Magazine were people were starting to use arduino as part of their model control systems.

    Regards
    Kevin
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    πŸ“ Electronize speed controllers
    7 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Many thanks for your advice on this. You clearly know your stuff and must be quite accomplished. I have researched the 'H' bridge and understand the function. Interestingly and before really good electronic speed controllers were available I have seen pictures and diagrammes of H bridge set ups utilizing sets of micro switches operated by a cam on a servo. Thanks again will follow your advice. PS ordered a solder pump over the weekend having seen one in use on UTube.

    Regards
    Kevin
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    πŸ“ Electronize speed controllers
    7 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Hi,
    Belay the last. I have been on line and have identified what a MOS-FET looks like. If you think that is likely to be the problem I may have a go at removing and ordering a new one to solder in.

    Thanks for the info
    Kevin
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    πŸ“ Electronize speed controllers
    7 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Hi
    I have in the past built an electronize controller bought as a self assembly kit. Could you describe what a mossfet looks like. I might be able to effect a repair. Would you be able to advise on how to test for a blown mossfet.
    Regards
    Kevin
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    πŸ“ Electronize speed controllers
    7 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Thanks Ian.
    Yes I agree a quality product andbritish made.

    Regards
    Kevin
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    πŸ“ Electronize speed controllers
    7 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Does anyone have the details or know if you can still get an electronize speed controller repaired. Grateful for any info.

    Regards
    Kevin
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    πŸ’¬ Re: SMBC back at the lake with some fast boats...
    7 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    I was referring to the first one in your video clip with the white superstructure.

    Regards
    Kevin
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    πŸ’¬ Re: SMBC back at the lake with some fast boats...
    7 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Hi. Glad to hear you are back on your lake. Most impressed with the Vosper Fast Patrol Boat. I am currently refurbishing an old Vernon version of this model. Would the owner be able to provide any details of her for example propulsion. Aldo's any info re the build or any photos?

    Would be grateful. A fantastic looking boat with great performance.

    Regards
    Kevin
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    πŸ’¬ Re: Formers and stringers
    8 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Nice clean work. I like the way you have pinned the top stringer to the bow hook while gluing/building. Never thought of doing it that way. Great idea,
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    πŸ“ RAF Crash Tender - 34" Aerokits - mid deck camber or flat?
    12 months ago by kevinsharpe ( Petty Officer 2nd Class)
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    Hi just to add to the debate. When I was a youngster my brother and I owned. Victory Industries RAF Crash Tender such as your model. The mid deck was most definitely curved. Some years ago I re visited my past and bought an old Victory Industries Crash Tender and the mid deck between the cabins is curved. I suppose it depended on the the faithful reproduction that the model was. I have to say it was a good scale model of the real vessel.

    Regards

    Kevin
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    πŸ“ twin propeller setup
    1 year ago by kevinsharpe ( Petty Officer 2nd Class)
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    Hi

    I guess you would have had to try the boat with one of the props contra rotating, you may well have seen an increase in speed and thrust. Also the more course the prop, the more critical the effect of loss of water pressure caused by the other and the greater effect of cavitation .

    Regards

    Kevin
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    πŸ“ twin propeller setup
    1 year ago by kevinsharpe ( Petty Officer 2nd Class)
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    Hi Doug

    Yes I get the point you make re torque cancellation. The other reason for contra rotation in twin props is the prevention of cavitation of the props. This would occur when one of the props suckswater away from the other. This creates a reduction in pressure around the starved prop resulting in water boiling around the prop blades due to pressure reduction and causing damage and pitting to the prop.

    Regards

    Kevin
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    πŸ“ twin propeller setup
    1 year ago by kevinsharpe ( Petty Officer 2nd Class)
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    Hi John.
    Just ad the spec on the component shop p94. You can use tank steering as the device has two speed controllers in built, but you need to have two channels for this i.e. One channel for each motor.

    Regards

    Kevin
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    πŸ“ twin propeller setup
    1 year ago by kevinsharpe ( Petty Officer 2nd Class)
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    Hi John

    The purpose of having left hand and right hand props installed on a twin screw vessel is in order to stop one propellor sucking water away from the other, therefore making one of the props inefficient by starving it of water that it needs to develop thrust. The set up should ensure that each rotates throwing water inwards towards the keel. Even though the props are handed differently and rotate in opposite directions they should both be pushing the vessel ahead or astern together. The motors can be controlled by one speed controller, ahead or astern but with one esc both motors will move ahead or astern together and at the same speed as they both receive the same command from the esc and you only need one channel to achieve this. Alternatively you can use two esc's one for each motor and control them independently and create ' tank steering' two channelsare required for this set up, one for each esc. The component shop device uses one channel to control both motors, along with a feed from the rudder channel. When rudder is applied then the mixing part of the unit slows one of the motors to allow the vessel to turn. The disadvantage is that you reduce the speed of one of the motors on the inside of the turn and therefore the vessel will lose speed. Using this controller does create a type of tank steering but I don't think you can turn on the spot i.e. One motor virtually full ahead and the other full astern.

    Hope this helps.

    Regards

    Kevin
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    πŸ’¬ Re: Fairey Spearfish
    1 year ago by kevinsharpe ( Petty Officer 2nd Class)
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    Hi
    Nice boat and quite rare. I believe it to be made from the Nor Star range of wooden kits. She is I think she is Wave Rider. Nor Star also made a slightly larger cabin cruiser called Wave Princess. Both look great on the water and there is film of them on U Tube. Enjoy the model. Would suit a brushless motor and either Lipo cells or Nickel metal hydride.

    Regards

    Kevin
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