Response

Re: WTC design.

Hi Peter, These are the type of that i installed in my Gato. The measurements are approximately 130mm x 46mm x 24mm. Martin555.

4 years ago by Martin555

Response

Re: SEAPLANE TENDER, CHANGE OF ESCs

Hi Peter, yes I cool the motors with brass tube coils and water pump. I'm not sure if they even get hot as I never tried without them. I work on the theory, 'put everything on you think you might need and if you don't need it you can take it off' I don't prop the motors too high,- rather let them rev higher with less pitch, thereby taking the load off the motors. The motors are 540 45 turns which is sort of 'low gearing, high torque' so they are not straining. I could put on much bigger props and make a speedboat out of it, but it wouldn't look right. are only 2s 2200 MAh and last for over an hour, so motors aren't sucking many amps. I use 2 12V 385 motors in the MTB with no cooling other than clip on heat sinks and a computer fan blowing air through the boat, and they've been running for years (get that hot you can't touch them) with no probs. Just keep the bushes oiled now and then. These are so cheap they are not worth worrying about. With fans and ready made water cooling plates available these days for ESCs etc there should be no overheating probs, and most ESCs have temp and low voltage sensors and cut out if they get too hot, or with low voltage, (if they cut for temp reasons you know to up your cooling or unload the motors) The modern boat/car ESCs are pretty much plug and play, - auto cell count sensing( LiPos), auto throttle centering etc) Still using a 70's 20A Futaba marine ESC (in the Fairacre launch) which is as good as any similar unit today. Just plug any 12v battery in (no need for cell counting LiPos) and away you go. Was used on 27MhZ but now used on 2.4. Also used an Electronize unit,- nice but huge and makes an annoying fizzing sound going slow so I replaced it. JB

4 years ago by jbkiwi

Response

Re: 40'' Seaplane Tender, on the water at last

Re - Good piece of water you have there JB - what is it dam or river Hi Peter, it's actually a drainage pond for the golf course and surrounding housing area, and belongs the the Gulf Harbour development co. The Gulf Harbour R/C yacht club sails there and are the ones who built the jetty. I was happy with the model and it ran as I hoped it would, luckily. Battery life running as it was in the vid, would have been around 45/50mins being safe, (not going below 3.3v/cell, - battery alarm is set for 3.6/ cell and had not gone off ) are 2011 and 2012 so they are getting on a bit, ( the 2011 is getting a bit puffy but still balances ok) I might replace them with 2800s but probably not necessary, as just chugging around I'd probably get an hour or more. Motors only draw about 2,1A max ea static, (under way less than that.) and seem just right for the boat. Had actually thought of something ducted fan powered, as I have around 8 various spares I built to experiment with in the Vampires (incl 4 in a ducted fan experimental quad I built, if necessary). see pic. Next model might be the 20ft Hartley cabin boat I built a few years ago, but that might be next year, as I have a lot of other things which need doing. I'm re-doing the Graupner Optimist at the moment between jobs. Thought about a ducted fan airboat (still have a hull I made 15yrs ago!) JB

5 years ago by jbkiwi

Response

Re: Supplies Arriving!

are scheduled for a Thursday delivery! Why is time going so slow?

5 years ago by figtree7nts

Blog

Supplies Arriving!

I had to order various supplies. For the Smit Nederland build! I just received the Metric Drills I ordered. See I have a set of American standard drills. But, I didn't have Metric. Now I have Metric drills. Which are used on the build of the Smit Nederland! Monday I should be receiving the . I ordered for my F-14 Controller!

5 years ago by figtree7nts

Forum

Fast attack craft

Re - It is good to have all this information on the different , Hi Martin, I think what we are trying to say is that all battery types are good as long as you maintain them properly and they are suitable for the job they are doing. are getting better and safer every day and the choices increasing as well so it can be confusing for beginners in the R/C hobbies. Unfortunately you do need to be aware of the technical stuff re -use and charging, as all battery packs can be dangerous (ie, try shorting a big NiCad or NiMh pack and see if the smoke doesn't leak out and melt your fingers!) They can cause fires too but people seem stuck on the LiPo 'dangers' and forget about those 'safe' . The good thing is that people can google anything these days and can usually check for instructions or possible problems before buying any product, model or otherwise. JB

5 years ago by jbkiwi

Forum

Martin Westquay's Piper Cub ;-)

Hi Martin, To take the pressure of your ' in a DX5e' thread ... 😉 Attached are a couple of pics of what you are getting for your dosh. A 550 size Thrustmaster motor, 8x4 prop and fittings are included. All you'll need to add is just water 😂 .. er make that covering fabric / foil and the electricals. A drop or two of glue might come in handy as well! Had to stay in today waiting for DHL to deliver my dichloromethane, it's arrived at last 💥😮 so I'll hopefully get the package off to DHL tomorrow. Cheers, Doug 😎

5 years ago by RNinMunich

Forum

Video chat / Roving Reporter - ''Does the site have a Youtube Channel?''

Hi Folks, As a spin off following on from the hijacked 😌 for DX5e thread from Martin W! If anyone has any further thoughts for a possible Video Chat link up and/or Roving Reporting from Club Events etc please feel free ("If you want to go any further it'll cost you"😉 as the actress said to the bishop😁) to add them here. Thanks. Cheers, Doug 😎

5 years ago by RNinMunich

Forum

Turnigy A-6-10 200W Balance charger & discharger

Help needed please, I’m not an electrics man I purchased this charger and two battery packs about 6 months ago and It’s been in the box ever since. And I am now getting round to sorting the electrics on my crash tender. however reading the forum article on “ in a DX5e” I am now concerned that the are in trouble. I Have the manual but to honest I can’t make any sense of the particular situation I have eg I have checked the output voltage on each battery not under any load and they both read 9.5v. What do I do next – discharge - charge – for how long etc Thanks⚡

5 years ago by mturpin013

Wiki

Battery Capacities & Wiring

DRAFT: TO BE REVISED ;-) (FB) can give you many different outputs (!?) depending on how they are wired up. As long as you don't have to worry about weight you could try endless methods of wiring different types of to get a desired output. Wiring in Series Wiring in series is a great way to increase voltage, as you can see on the diagram below the voltage is added up in each cell which then equals its output. The mA/h does not change when are wired up in series. The only problem with wired up like this is that they are prone to faults, were you end up with a 'dead cell', this means that when you are charging/discharging the pack there might be one cell that doesn't hold its charge as much as others bringing the overall capacity of the battery down. Wiring in Parallel (DON'T DO IT!!) When are in parallel the mA/h will increase (not the voltage). Remember:- the mA/h does not mean the current going through speed controllers etc. it is only a guide to the maximum current a battery can except where it will last for one hour. Theory About The Whole mA/h Thing! Just think of the being a tank of liquid, when the liquid runs out the battery runs out. Below are four diagrams:- The height of the liquid in the tank increases the pressure/voltage at the bottom. The area of the liquid increases the overall capacity of the tank/battery. The number of amps the motor can draw is not limited to mA/h of the battery, the mA/h is only a guidance figure to tell us how many hours it will take before the battery/tank runs out. If you really wanted you could let out 10 Amps worth of liquid, just that the battery wont last very long unless it has a larger capacity. In Car Terms The diagrams below explain the differences between the size of the tanks and the distance that can be traveled. 5 Gallon Tank = 1000mA/h Battery 10 Gallon Tank = 2000mA/h Battery If you have a car with a small fuel tank it might do say 100 miles at 50MPH. if the same car had a larger tank it may do 200 miles at 50MPH. The size of the tank does not effect the speed the car does, but it will effect the distance it can travel. Golden Rule DO NOT MIX OF DIFFERENT TYPES!

5 years ago by fireboat

Wiki

Battery Capacities & Wiring

DRAFT: TO BE REVISED ;-) (RN) can give you many different outputs (!?) depending on how they are wired up. As long as you don't have to worry about weight you could try endless methods of wiring different types of to get a desired output. Wiring in Series Wiring in series is a great way to increase voltage, as you can see on the diagram below the voltage is added up in each cell which then equals its output. The mA/h does not change when are wired up in series. The only problem with wired up like this is that they are prone to faults, were you end up with a 'dead cell', this means that when you are charging/discharging the pack there might be one cell that doesn't hold its charge as much as others bringing the overall capacity of the battery down. Wiring in Parallel (DON'T DO IT!!) When are in parallel the mA/h will increase (not the voltage). Remember:- the mA/h does not mean the current going through speed controllers etc. it is only a guide to the maximum current a battery can except where it will last for one hour. Theory About The Whole mA/h Thing! Just think of the being a tank of liquid, when the liquid runs out the battery runs out. Below are four diagrams:- The height of the liquid in the tank increases the pressure/voltage at the bottom. The area of the liquid increases the overall capacity of the tank/battery. The number of amps the motor can draw is not limited to mA/h of the battery, the mA/h is only a guidance figure to tell us how many hours it will take before the battery/tank runs out. If you really wanted you could let out 10 Amps worth of liquid, just that the battery wont last very long unless it has a larger capacity. In Car Terms The diagrams below explain the differences between the size of the tanks and the distance that can be traveled. 5 Gallon Tank = 1000mA/h Battery 10 Gallon Tank = 2000mA/h Battery If you have a car with a small fuel tank it might do say 100 miles at 50MPH. if the same car had a larger tank it may do 200 miles at 50MPH. The size of the tank does not effect the speed the car does, but it will effect the distance it can travel. Golden Rule DO NOT MIX OF DIFFERENT TYPES!

5 years ago by RNinMunich