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>> Home > Tags > mfa

mfa
mfa
SeaSpray by pjarrett Petty Officer   Posted: 3 days ago
[Score: 8/10] 38"/5000g SeaSpray Capable of 12mph and a runtime of 20mins Single Propellor (2 Blade S Type 35mm) Direct Drive to a MFA 850 (2 Blade S Type) Powered by LiPoly (11.1v) 6Amp/h Batteries - Comments: Purchased as kit around 1972, fibre glass hull with ply deck and superstructure. Had many changes and refits over the years and was originally fitted with and OS Marine glow engine which gave good performance and was quiet! Changed to the MFA electric motor with ESC. Installed two LiPo batteries which makes the hull well balanced and allows the deep V hull design to plane as designed. Have designed and made two electro-magnetic lifting sticks which help me raise and lower the boat into the water. Age related launching aid!

850 Brushless by BOATSHED Captain   Posted: 9 days ago
Hi canabus, could you please tell me what brushless motor's you have in your, Sea Hornet,Sea Commander and Sea Queen pelese. I have all three of these as well. Somewhere down the line I will be converting those to brushless. I don't understand all the electrical data myself. I do have a Proboat Miss Geico and she is awesome on the water at full speed. I have purchased the same motor and speed controller as what is in her to put in a new MFA Spearfish that I still have on the shelf in my work shed. I look forward to your set up's.

850 Brushless by RNinMunich Fleet Admiral!   Posted: 9 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 😎

850 Brushless by AndyG009 Sub-Lieutenant   Posted: 9 days ago
Does anyone know of a brushless motor that is the equivalent of the MFA 850 Tornado ? Approximately same rpm / power (or slightly more power).

Strange Email by RNinMunich Fleet Admiral!   Posted: 18 days ago
So did I! I also ran across this post from bilzin (AKA Bill Morrison-Bates) on the British Model Flying Association page http://b style='background-color:yellow;'>mfa.org/class1/id/45473 Also selling due to 'failing health'. Very odd 🤔 Failing memory perhaps!? Doug 😎

MFA Piranha by CraigRobotham Commander   Posted: 21 days ago
Hi Boatshed , Yes all MFA seem great boats . As for the Spearfish I have a Thumper Overlander in mine 2nd hand and cheap . If you want the wow factor in yours look to fit a Leopard brushless in runner as the result is fantastic . Look it up on YouTube couple of films of one ripping round a pond 👍

MFA Piranha by BOATSHED Captain   Posted: 25 days ago
I have a MFA Piranha almost finished in my shed and a MFA Spearfish I purchased from a model shop in Cromer. That shut down not long after I purchased it. That's still in the box as new. I intend at some point to put in a brushless motor. I have one already. I got both Motor and Speed controller the same as in the ProBoat 29" Blackjack. I already have the ProBoat Miss Geico that is a maniac on the water. So I'm hoping once I do the Spearfish that will also be awesome.

Solent Class Lifeboat "Douglas Currie" by Skydive130 Fleet Admiral!   Posted: 27 days ago
I quite agree Dave, the MFA 850 motors at 4/5ths chat push her along at a very pleasing and hopefully realistic speed. Ive enjoyed this build and had alot of pleasure posting myn progress, hopefully its been enjoyed by all and if its given anyone else some inspiration, even better. Please feel free to watch my Vosper RTTL build elsewhere! kind regards simon

rotating radars off mast by reilly4 Lieutenant   Posted: 1 month ago
Hi Seafarer, I have a few ships with rotating radars I have a few of these motors per the link below. They rotate quite well with one cell (1.4 volts) Gear Motor 3 - 224:1 90 Degree Shaft https://solarbotics.com/product/gm3/ I also have some of these, but they require a bit more vertical space. MFA 951 Series Motor and Gearbox 298:1 6volt (from CMB in the UK). I run these on 3 volts. Both are quite small. I have also used old servos in a couple of places.

Motor problem by Haverlock Fleet Admiral!   Posted: 1 month ago
RE850 Motor 12.0 Volt with mount Ref: MFA457RE850 8000 RPM at 11amps at maximum efficency. Ideal for large models and props up to 75mm with direct drive. Output shaft dia is 1/4 in http://www.model-dockyard.com/acatalog/Direct_Drive_Motors.h... hope that's some help

Motors and ESC are in! by Skydive130 Fleet Admiral!   Posted: 2 months ago
Started back on doing some work on the inside today. On/Off switch, ESC, 2 x Motors (MFA 800), Prop shafts and Prop shaft supports fitted. Another coat of 2 part resin and a coat of varnish inside to end the day. Tomorrow plan on getting the battery/sound card/speaker tray in and to give the outside of the hull its 3rd and final coat of resin before its ready to final sand and start the painting. Jusdt a couple of very small jobs left on the upper superstructure and will call that finished! Hope to have a video uploaded tomorrow showing working lights and radar (providing the searchlight arrives from eBay, if not wednesday.

MFA TORPEDO 500 / BATTERY INFO by al2612 Seaman   Posted: 2 months ago
Tx to all for the valuable information posted a lot more to think about but sure it will all turn out fine eventually

MFA TORPEDO 500 / BATTERY INFO by RNinMunich Fleet Admiral!   Posted: 2 months ago
Same as mine from HobbyKing, this type comes in various colours under various names but they are all made by Husang in China😉 You can also connect it between charger and battery to measure the charge (capacity in mAh) you've poked into the battery. This you can then compare with what is taken out again when running or testing motors. 👍

MFA TORPEDO 500 / BATTERY INFO by Haverlock Fleet Admiral!   Posted: 2 months ago
https://www.ebay.co.uk/p/Ft08-RC-150a-Hight-Precision-Watt-M... one example of the breed it is fitted ( when testing) between the battery pack and the ESC and gives a real time V A and watts

MFA TORPEDO 500 / BATTERY INFO by RNinMunich Fleet Admiral!   Posted: 2 months ago
Hi al, jarvo's answer is more or less correct but not the whole story! Here is a reprint from my attempt to clarify various misunderstandings and misuse of terms related to batteries - usage and maintenance - posted to a thread "battery charging" you can find under 'General Sailing'. "Hi Both (and all other non-technical guys here!) (Dave_M please jump to the next post or topic!😉) To avoid further confusion amongst the non-technical members can we perhaps straighten out the technical terms involved in battery charging and use (strictly speaking the dimensions or quantities involved). mAh (milli-amphour) is a measure of the capacity of a battery: how many 1/1000 of an ampere (A) it can theoretically deliver in one hour, if in perfect fully charged condition and under perfect environmental conditions. (What you ain't never gonna get!) When the outside temperature drops so does the usable capacity 🤔 Charge and discharge rates are measured in ampere (A). under 1A the milliamp (1A/1000, unit mA) is usually used for convenience. Quality battery packs are marked on the case with maximum charge and discharge rates in A. Sometimes marked as xC/yC. xC is the MAX charge rate and means x times the nominal capacity/1000. yC is the MAX discharge rate (i.e. what your motors take) and often means y times the nominal capacity/1000. Sometimes the max discharge rate is given as a multiple of the max charge rate. See example in my photo. These are MAXIMUM warnings and NOT to be taken as the norm! See example in pic. Capacity 4000mAh = 4Ah, MAX charging current is 8A =2C, (4000/1000)x2. Half an hour charging gives then 8/2=4Ah. I would never ever charge at anywhere near this rate! Charging at 500mA (0.5A) for 8 hours (0.5Ax8h=4Ah) is perfectly adequate and much more gentle on the cells i.e. longer life 😉 MAX discharge current is given as 240A = 30 times max charge current or 60 times capacity in Ah.(4). If I used it at this rate it would probably be irreparably damaged (toasted) in just under a minute (0.9999r) 😡 If any Lixx pack gets HOT while charging or in use take it to recycling pronto, before it sets fire to your boat or workshop/house😡 ALWAYS MAKE CERTAIN THAT YOUR CHARGER IS SET FOR THE TYPE OF PACK YOU ARE USING, NicAD, NiMh, LiPo OR LiION etc (don't forget the balancer connection!). Sorry for teaching some 'grandmas' to suck eggs but having seen so many questions about battery charging and much misuse of the parameter units for batteries in the responses (as above) I felt it was time to clarify things for the non-technical among us, for their own safety and the health of their wallets!" Cheers Doug 😎