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>> Home > Tags > ballast

ballast tank
Graupner Elke HF 408 by AllenA Fleet Admiral!   Posted: 2 days ago
Hi Dave and Doug. I love it when you two start chatting it's like tipping a cornucopia of knowledge all over the floor of my workshop. I found my original notes and the motor is a Mabuchi TD224 23. The shafts are: S.H.G Marine Miniature Propeller Shaft Assembly Stainless Steel Propeller Shaft assembly with Brass Outer Tube M2 Diameter Shafts An excellent range of miniature shaft and tube assemblies with Grade 303 Stainless Shafts and Hard Grade Brass outer Tubes. The outer tube diameter is 4mm, Shaft Diameter 2mm The Bearings are Oil / Water lubricated Acetyl material and are extremely hard wearing and quiet, The Shafts are Threaded at one end with an M2 Thread. The propellers are: RADIOACTIVE MA 3045 RC MODEL BOAT 3 BLADE 30MM PROPELLER M2 THREAD 2 OFF. As my Nimh battery is reading 8.09v so it's unlikely that there is a weak cell, I will recheck all the readings and be a little more precise to ensure I am not leading you on a wild goose chase. The biggest clue is that I have just measured the battery holder plate. The measurements are L130mm, H36mm and W65mm. Looks like the only battery that will fit is the PS-630 6V 3.0Ah 150mA 134(L) x 34(W) x 60(H)mm 0.7kg or similar. This looks right as it will probably take care of the ballast issue and it's no wonder my normal 6v battery wouldn't fit. It will be a couple of weeks before I can put her on the lake but at least the battery is ordered. Thanks again for all the info. One final thing... Can you tell me how to measure propeller pitch?

Graupner Elke HF 408 by RNinMunich Fleet Admiral!   Posted: 3 days ago
Evenin' Dave, "Interesting stats especially the stall current. This would rate the motor at 280 Watts with your 7.2v battery" 😲 If the battery pack was 7.2 volts nominal and was 'healthy' then according to Allen's measurements it was down to an average of about 0.98V per cell. Also not so healthy for a NiMH. 5.91/5=1.182 volts per cell. A healthy voltage for NiMH 😊 Indicates a shorted cell if it was a 7.2 pack, and the healthy cells could still deliver 40A for a short while. If the boat needs ballast anyway I would go for the useful ballast of a 6V SLA. Which is what I intend to use in my Danish cutter with the Taycol Target. Such boats don't need the short term, high current that NiMH and LiPos can deliver. G'night All, Cheers Doug 😎

MV TEAKWOOD by RHBaker Fleet Admiral!   Posted: 3 days ago
The vessel is virtually compete, just a few finishing touches such as decals and top masts. Building the deck equipment did not present any unexpected challenges and everything progressed quite quickly. Much assisted by an unusually cold Canadian winter – where is Global warming when you want it? The only comment is that this ship has a lot of deck railings, even with a simple jig these are time consuming. Am hoping to try the first on water ballast check in about ten days, A review of similar models and weights suggests something like about 4 lbs will be needed.

Graupner Elke HF 408 by AllenA Fleet Admiral!   Posted: 3 days ago
Hi Doug, I put the Watt Meter to use and with about 16ozs of ballast, might need a bit more, had 6.77 amps at full forward with just over 40 watts . At complete stall with prop spinning she jumps to 40 amps which I guess is to be expected. She is, obviously, too fast for scale so I will need to control via the Tx. Might look for a smaller propeller.... what do you think? Thanks for your help.

Graupner Elke HF 408 by AllenA Fleet Admiral!   Posted: 4 days ago
Elke HF 408 now refitted. Running on a Mabuchi motor geared 2:1, 2mm shaft and 30mm 3 blade propeller. Still fiddling with the ballast but almost ready to sail. Yet to find a suitable fishing net to suit 1:36 scale. Control is via a 40mhz Hitec Ranger 3, Acoms receiver and Chinese 320A fan cooled ESC. As they would say in Cardiff she looks tidy. Many thanks to Tica/BRCarsten for photos of the plans.

VALIANT by Colin H. Fleet Admiral!   Posted: 13 days ago
[Score: 8/10] 48" VALIANT Capable of 4mph and a runtime of 90mins Single Propellor (4 Blade 70mm) Geared to a 540 (4 Blade) Powered by Lead Acid (12v) 14Amp/h Batteries Controlled Through MTroniks Viper marine (25Amps) ESC - Comments: This tug was built by a modeler in Bristol during the early 1960's it was given to me at the Abergavenny Steam and vintage show in 2016 by the makers grandson who told me it had been on display in his mums house from 1970 when his grandad died till 1987 when she died then put in his parents attic till it was given to me. it had a couple of holes in the hull and the upper works had been broken so required fixing. not having any pictures I used all the original bits that came with it so I hope it looks as it should. It's made mostly from balsa with some wooden bits and replacement planking from coffee stirrers otherwise all original. It requires 2 x 12v 7ah lead acid batteries and about 5 kilograms of ballast. (Silver Sand in 500grm packs). On the only test run I've managed to tow a 16 foot fishing boat with three men on my local fishing lake.

Thurl pin rack by SelwynWilliams Admiral   Posted: 16 days ago
Ballast. Rack shown on the two knight heads supporting the mast so called as they usually have carved heads, this photo of theones on the Golden Hind. Foreknights mentioned as being recovered from a wreck meant the knightheads supporting the foremast, presumably main and mizzen knights for the other masts

Thurl pin rack by Ballast Captain   Posted: 16 days ago
Thurl Pins are also the name for the two pins that are used as rowlocks on pilot gigs ! Here is a Belaying Pin Rack !

Affinity racing jacht by watson220 Lieutenant   Posted: 20 days ago
SPECIFICATION: Total lenght:650mm Beam:150mm Mast height :915mm Overal height: 1338mm RTR total weigh:1290g (without 4pcs AA batteries) Hull material Plastic Sail material : Mylar INCLUDED: *Completed hull with pre applied graphics. *Two milar film sail sets *Carbon fiber masts and booms ]2Rigs] *Zinc alloy ballast and aluminium alloy fin *Powerful sail winch *Metal gear rudder servo *Battery box an On/Off switch for receiver *AA Nimh batteries 2200mAh for transmitter and *rc/radio FrskyTaranis 2.4Ghz

Riva scratch built boat update by Alan999 Lieutenant   Posted: 23 days ago
I launched her yesterday and she went well. No ballast was needed and I put a 9.7 battery for powering. She is very fast and two weeks time will go on the boat clubs water in Torrevieja,

Free Plans by Alan999 Lieutenant   Posted: 25 days ago
My Riva is launched today.31 ins long x 11 wide.cost approx £230 plus elbow grease. 9.2 battery 3.700. Plenty of lead fishing weights for ballast and fingers crossed.

First test run by BOATSHED Admiral   Posted: 1 month ago
You could always do a ballast test in the bath, without running the motor.

Getting the ballast correct by Dave M Fleet Admiral!   Posted: 1 month ago
Glad to have helped. Looking forward to seeing some on water shots in the Spring!

Getting the ballast correct by Ron Fleet Admiral!   Posted: 1 month ago
Dave I did as suggested. The water line on the plan is for a pond boat or shelf model, so having placed four AA batteries in it the water line changed by 1/8” . I think if I am careful about the size of sail put on it, I should be able to see it on the pond in the Spring.

Getting the ballast correct by Dave M Fleet Admiral!   Posted: 1 month ago
The plan seems to indicate weight in the keel, which is where you will need it. I suggest you put the model in your bath add the steel and see how the model floats. All the keel and an inch or so of the hull should be submerged with the weight battery and servos resting in the hull. Add or remove weight to get about right. I would cut a slot in the keel to add the weight as low as possible. The plan seems to suggest this. Seal temporarily and recheck for correct waterline. You could use cling film to seal whilst checking. When happy make good the keel and fit the servos etc and check again before fixing the deck.