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>> Home > Tags > lead acid

lead acid
lead acid
Fairmile D 1/24 Scale Build by bikerjohn57 Sub-Lieutenant   Posted: 2 days ago
Don't quite understand why you would want to run four props & motors. One of my fleet is a old Precident Perkasa, in all wood including the hull. Powered by a 12v 7ah lead acid battery a single 550 motor and a three blade prop. As you can probably imagine she is heavy but still gets on the plane to mimic the real thing, will admit the motor did get a bit hot untill I fitted a heat sink with fan cooling. I also have a Hooben Perkasa in injection moulded plastic, yet to be built but intend to use the same set up. Cheers for now John👍

Ship rudders by Toby Lieutenant   Posted: 2 months ago
Couple of other plates. When I have finished the rudder and housed it to the rudder post and sorted the rc control linkage for it I will take out too the pond for ballasting and a swim. Once I know how much and where ballasting is needed I shall insert aluminium angle in to the hull to house lead acid batteries and lead blocks.

Tarpon hardware help by RNinMunich Fleet Admiral!   Posted: 2 months ago
Hi Gordon, "the boat is to be a present for my son. He works abroad for long periods and I reckon a lead acid would go flat beyond recovery." In that case an SLA (especially the types produced to power alarm and emergency lighting systems) would be your best bet. They can be left on trickle charge indefinitely. Two 6V in series might be better than one 12V to help with trimming out the boat. I use a pair of 6V 3Ah (about 600gm each) in my 135cm destroyer and 107cm submarine. They run for hours if I don't keep the pedal to the metal all the time. 😉 Back home I stick 'em on the trickle charger and leave 'em until the next outing. They've lasted my several years so far. Much longer than my NiMhs. An NiMh looses approx 1% of it's charge per day. So, assuming it starts fully charged, in 3 months or less it would be in Deep Discharge and have joined the Dodos😭 Cheers, Doug 😎

All hooked up, nowt happens... by rapidair65 Seaman   Posted: 2 months ago
Following this with some interest as I am about to convert my Arun lifeboat to a brushless set up using Turnigy Aerodrive motors and marine esc. Hoping to keep the two lead acid batteries for power as they make good ballast!

A return to the hobby! by J. Barry Chief Petty Officer   Posted: 2 months ago
I would appreciate some input as to the type of battery. My inclination is to go for a lead-acid, as I would like the additional weight. I feel that most models look too light on the water. The motor is a mtroniks 660 with a Viper Marine 25A ESC. Any advice would be appreciated!

Tarpon hardware help by Gordon-B Petty Officer   Posted: 3 months ago
Thanks Steve, my choice would have been lead acid, but the boat is to be a present for my son. He works abroad for long periods and I recon a lead acid would go flat beyond recovery. So my choice now is a NiMh Pack SubC of 9.8 or12V, minimum 5000mah in case he blows hiself up using LiPo's. I want the boat to have a speed around a brisk walking pace. Thank you again for your reply.

Tarpon hardware help by steve-d Commander   Posted: 3 months ago
Pretty boat that. Probably know as much about motors as you do but, What may make a difference is what battery you intend to use, Style of boat does not make for rushing about the pond so a 12v lead acid battery would probably be in order in which case the 12v nominal motor would suit. If you plan to use Nicad 7.2v battery then the other motor is more suited. waits to be shot down or should that be scuttled. Steve

54" long Cervia tug. by tysonyoung Petty Officer   Posted: 5 months ago
My Cervia was ready built. I have replaced the Electric motor with a large servo motor (Brushed) .Direct drive and being heavy helps with ballasting. lead acid gel cells are power source. Motor rated voltage24 v but run it on 12v . low rev high torque no load current 1 amp. Shaft diameter 0.5 in. Gives some idea of power out. Being servo motor (ex computer drive 30 years old) well balanced no vibration. Photo near shore shows power of motor.

HMS Bulldog by ikseno99 Chief Petty Officer   Posted: 5 months ago
[Score: 8/10] 48"/12000g HMS Bulldog Capable of 4mph and a runtime of 120mins Twin Propellors (3 Blade 40mm) Direct Drive Powered by Lead Acid (6v) 12Amp/h Batteries Controlled Through Action Electronics P94 ESC - Comments: Metcalfe Kit at 1/48 She is has fine lines and looks well on the water. She handles reasonably well with independent control on each shaft given her length and the amount of superstructure too. She has direct drive on each shaft and need a load of ballast in the stern to keep the props well in the water otherwise she will capitate quite dramatically Running 2 x 12 Amp Hour lead acids she has a great run time, helped by her hull lines, she will carry her way for quite a distance, so yo need to keep your wits about you on a busy pond! She is an ongoing project / refit with new davits and ships boats to be added.

Graupner Jumbo 540 motors by CB90 Fleet Admiral!   Posted: 5 months ago
I think it would be worth the risk of running the DC Motors at 7.2v (NiMh) or second choise 7.4v (Lipo) and get rid of the 6v lead acid battery. The chance of damaging the motor is limited, the battery packs will be lighter than an equivalent lead acid, but will need to by a charger as well. Always put a fuse in line rated 5 amps below that of the ESC. Or buy two higher voltage motor? only £6.99 each plus P&P link copy and paste into browser address:-

Range Safety Launch? by CB90 Fleet Admiral!   Posted: 6 months ago
Some Pictures for reference a RAF 43ft Range Safety Launch pennant '1640' and '1651' were built by 'Thornycroft' at Hampton in 1955. The Model Looks good, adding some detail and fittings will make it look great, bear in mind its a heavy boat, so you may wish to think about brushless motors and Lipo batteries, they will be a lot lighter and smaller than the 800 brushed, and lead acid batteries but you need to get advice before going down that road.

Which battery? by Brianaro Sub-Lieutenant   Posted: 6 months ago
Thank you for that, it has helped a lot. I have liPo in another fast boat and do worry about the safety, I keep and charge it in a fire proof bag. I will need weight at the front of the boat so Lead Acid will probably assist. The build is good fun. Thanks again

Which battery? by marlina2 Chief Petty Officer   Posted: 6 months ago
I tend to use LiPo's but they can be temperamental and need the correct charger. They are smaller and lighter than NiMH and give you a much greater output. NiMH are similar in size to LiPo but are heavier and will not have the same sort of power available. Lead acid are the easiest to use in terms of charging but are much heavier and larger then the other 2 types but tend to be cheaper. Lead acid are a good option if you need the ballast or are not limited on physical size. Cost is also a consideration a good quality charger can be an hefty investment but will serve you well and if you buy the correct type will charge/discharge any battery type that you have. I have heard horror stories about LiPo's bursting into flames, which my son did with his RC car. this was down to him not understanding this type of battery. I have not had good results in terms of endurance with NiMh but Lipo's if correctly selected will last much longer, a word of warning here though, they will stop working suddenly with no indication like running slow etc so if using LiPo's you will, need an alarm on each battery. Lead acid is much easier to in terms of Voltage either 6 or 12v with real problems when connecting them in series or parallel for use or charging, a little harder with the other two types but not impossible. This has probably confused you even more but I am sure you will come the correct battery. I have to confess I have an interest in this build as I intend it to be my next project👍

Which battery? by Brianaro Sub-Lieutenant   Posted: 6 months ago
I have a 1:16 Taymar lifeboat with twin Graupner 600 motors. Which batteries, Lead Acid or NiMH. Can anyone help please, what is the benefit of one over the other?

Which motor by Helineil Chief Petty Officer   Posted: 6 months ago
Could someone advise on which motor to use in a smit amsterdam tug of approx 40 ins long with a 4 blade 3 ins dia. Prop and 4 mm. shaft, I want to run on 12v sealed lead acid battery. I am not going to tow anything but would still like a bit of power. Cheers. Neil.