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>> Home > Tags > power boat

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Introducing me by Bryan-the-pirate Lieutenant   Posted: 1 day ago
Hi All, I am Bryan a sailor with the Chichester Model boat group. The site wouldn't let me use Bryan so I had to add the pirate to register on the site. Look in my harbour for the explanation of the pirate bit. My Boats are mostly sail powered but I do have a torpedo boat and two tugs and a few projects including steam powered boats. I do like the site and have found the advice given very helpful.

London Model Engineering Exhibition by robbob Fleet Admiral!   Posted: 1 day ago
Don't miss the London Model Engineering Exhibition at Alexandra Palace. Friday 19th January - Sunday 21st January The South's Major Showcase of Modelling... Not to be Missed! I'll be showing my RAF Crash Tender on the Blackheath Model Power Boat Club stand. http://londonmodelengineering.co.uk/ http://londonmodelengineering.co.uk/showguide.pdf

Re Boat Harbour entries by Bryan-the-pirate Lieutenant   Posted: 2 days ago
It may be the user interface is a bit clunky, I am very new on here and have found the drop boxes difficult if the model is a yacht rather than a powered boat. The photo upload only allows one photo at a time. On the Main point I agree a photo speaks a thousand words and is far better than just words however eloquent the author is.

850 Brushless by canabus Admiral   Posted: 7 days ago
Hi Andy Slightly more power with a brushless motor is a no go!!! Brushless motors the same size are far more powerful !!! But, the about same RPM a Turnigy L5055-700kv(500 rpm more on a 4S(14.8 volts) Lipo battery would be a good replacement. Mind you at 1600 watts( about 2 and 1/4 HP) these will used in a large boat like a 46" Vosper Crash Tender or a 46" Sea Queen!!! My move into brushless motors I have found that they are 7 to 10 times more powerful and equal to, if not better than the old IC motors!!! My Sea Hornet, Sea Commander and Huntsman run brushless motors . My Crash Tender is getting the 5055 motor, so it will be interesting to see what it will go like!!

850 Brushless by RNinMunich Fleet Admiral!   Posted: 7 days ago
Hi Andy, what you might call a FAQ!! Have a look at the info here to help filter the plethora of motor specs and find something close to the MFA850 performance - or better as the brushless motors are more powerful size for size and LiPo batteries much lighter. http://www.thercmodelboatforum.com/t1234-brushed-to-brushles... As a guide here is a table of the Graupner brushless specs for you to compare with the 850 spec. There is no conversion table as such, especially since with many brushless and ESCs you can alter the performance by adjusting timing at the ESC! Turbo!! Happy hunting, cheers Doug 😎

46" Firefloat What Motor/Battery by canabus Admiral   Posted: 24 days ago
Hi What type of props are you using(size and number of blades). I see your basic problem is under powered motors and a very heavy battery. I made the big switch over three years ago from brush to brushless motors and to Lipo batteries. With the help on the forum and club members it was a learning curve, but, I would not go back. A 5800mah Lipo battery is in the weight of 450 to 570 grams and would give you a good 1/2 hour run time. A good balance charger and safety bag are the main requirements, also maximum charging for the 5800mah battery is 5.8 Amps(same as the old Nicads). Also a low voltage battery alarm. Your 600 motors can draw up to12Amps !!! Replacement same size motors for your mounts would be 35mm brushless motors, but, you will require two ESCs with a Y connector to run on the same throttle channel. Replacement brushless motors are far more powerful e.g. a Hobbyking 3639-1100kv with a 60Amp ESC on a 4S 5800mah Lipo Battery is 800watts and with two in your boat is 1600 watts!!! Your old motor would in the 100 watt each mark !! I have the same size crash tender, but, with a single brushless motor. I have all the order numbers for the motors etc. and a setup the ESCs if your require. Canabus

Sea Queen Prop shaft by AndyG009 Sub-Lieutenant   Posted: 25 days ago
Hi all Have purchased a Sea Queen kit, and after getting info from this site plan to fit a brushless motor and Lipo's. Have been advised to change coupling from supplied, for one that will take the power - comments please. Also is there likely to be problems with more power going through the long M4 prop shaft ? I would rathersolve problems now before boat is built, so any help would be useful.

Richards 48" Swordsman by olly49 Chief Petty Officer   Posted: 29 days ago
I bought and built my Huntsman back in the late 70's. Decided last year to refurbish her. She is powered by a T600 brushless motor, 2 11.1 v lipos these are positioned midships, x50mm prop, tends to start bow down but when on the plane she looks a beautiful sight. I must say of all the boats I have this is the favorite one.👍

Veron Vosper RTTL 28" by surfacesub Seaman   Posted: 30 days ago
How refreshing to read this thread. I built this kit in 1959/60 and from memory powered by a 1.5 c.c. E.D. diesel. Radio control I used a Reptone single channel unit for the rudder only. We had always had some sort of family boat on the river and not being able to be on board the RTTL was very frustrating for me. Sadly I sold the model as my training/career took hold. To this day I wonder if she has survived the test of time. She had a unique (highly illegal) ID number 2945. If any model boat enthusiast stumbles over my motley attempt at this Veron kit I would be very interested to hear? Good luck Skydive130 and enjoy the building experience!

Motor problem by pmdevlin Fleet Admiral!   Posted: 1 month ago
Hi Richard, that lead acid is way too big and heavy. I Remember going on hols as a kid, car was loaded up, all family, roofrack, deck chairs, tent and so on, and Dads old Moggie Traveller would barely climb the Welsh hills! Same here, its just dead weight, ideal for a tug etc, no speed required, and ballast needed. This boat wasn't any slouch in its day, As Havelock says, it was originally built as a ic powered model so could stand being heavy. To achieve balance, its a matter of moving things around, not adding, so just move things forward, you will be surprised how the weight increases once you start adding Deck clutter, fittings and so on. Lightweight, is good. Your comment, stood up in the water at half throttle isn't going fast, its just bad weight displacement causing the bow tyo be too high. That setup would never have been that fast, the motor/battery combo will never cause a heavy ply boat to be going that fast its standing on end Couple of things to consider. Your nimhs, how many times have these been cycled, and what sort of charger are you using? A reasonable charger will give the information, if I know what you are using, Ill advise accordingly as you might not be getting the best from these batteries what prop are you on Think of an rc plane (if you fly them its easier) If the cog is too far back, the nose is pitching up, and its almost impossible to control, it almost porpoises in the air, and is very bad. COG is vital on a rc plane, nose heavy is better, only because its more controllable. COG is equally important with a boat, but harder to see the implications, the hull will give us false info, such as if the bow is up its on the plane, no, not necessarily, its not planing due to speed, its just out of balance. Shifting the weight radically will let you see this, sorry for the ramble, Wish you where closer to me I would love to help hands on👍 Ive tried to find a suitable video of my Huntman to display what I'm rambling on about. This video is poor quality, but it displays that boat moving very fast (25mph with on board data logger) but look how flat it is, its planning, as the forward 1/3 of the hull is out of the water, but its not standing on its tail, this is because its balanced. You boat is pretty similar in design to this so whilst you wont want to go this fast, the picture should look the same. This Huntsman weighs 6kg with batteries (lipos, you will NEVER get a nimh or lead acid to do this) and is 4 foot long, so quite a heavy old girl first constructed as an IC model in the early 70's. https://www.youtube.com/watch?v=e5-YmmElIfk&t=34s and here is a picture of my 3 foot aerokits fireboat, bow up, is it planing, no, its way out of balance, it wasnt actaully going that fast Hope that helps Paul

Motor problem by RichardSReade Sub-Lieutenant   Posted: 1 month ago
Motor fitted to platform and luckily there was enough depth to screw the motor platform to the stringers, I have moved the reciever forward to where it was and resecured the powerbox in a better position, just the leads with the bullet connectors from the motor to fit, although I have fitted the sealed lead acid 12 volt battery instead of the lead ballast (same weight) I have left the7.2v in situ as I trimmed the boat with them in and will see how it goes, it may have too much power on 12 volt and at least if my finger on the stick lacks control on the speed, I can slow things down by swapping over to the 7.2v batteries. If and when the sailing side is sorted, after seeing the pictures of members boats and ships, I think I will give it a good rub down and respray and smarten the inside up as well. Eventually I will get on with the Lloydsman

International Model Boat Show by glyn44 Chief Petty Officer   Posted: 1 month ago
Hi Chris, I too have looked at reviews, and videos of scroll saws. Trouble is nothing suits everyone. Some love, and others not so keen on all,of the choices. So I reckon it’s upto me to dip my toe in somewhere. I can collect from machine mart as there is one up the road from me. I am hoping to get my three power tools for around £300. Fingers crossed! Yep the boat I’m going for is the Dave Melbourne Huntress in that very Mag. Hope I bump into you Friday as I will be on my own all day. Regards Glyn.

Motor problem by Haverlock Fleet Admiral!   Posted: 1 month ago
Your original motor was a 650 and you had it over propped so its current draw was way to high so it burned out because it couldn't spin fast enough. The 850 is a MUCH more powerful motor and should be able to handle a 50mm prop. The 850 will spin faster so less current drawn ( I know that seems counter intuitive but its how it works) Your boat will probably go faster but you can throttle back to get the speed you want.

Motor problem by canabus Admiral   Posted: 1 month ago
Hi I use a Turnigy 180Amp watt meter and power analyzer(part No.9598000004-0) 0-60 volts , size 85 x 42 x 25mm, 82 grams. Requires your battery connectors. Use it in line with the main battery on board the boat. We used it on my mate's Spearfish and got 72.88 Amps on a brushless motor at 37 KPH. Canabus

Twin motor control problem by Haverlock Fleet Admiral!   Posted: 1 month ago
Your problem is interesting me one other thought is:- when the boat is out of the water the loading ( current) is way lower than the same motors in the water. It may be possible that the increased current is causing the voltage to " sag" and thus cause all sorts of strange effects. One simple thing you could try is to remove the red lead from the ESC(s) and power the receiver from its own battery. That's the red lead to the RX not the ones to the battery. If you can use a watt meter to read the battery voltage and current draw with the boat in the water.