fly boy3 Posted July 6, 2012 Share Posted July 6, 2012 Hi, Has any one got a drawing of the connections for the old type Twin Star with brushed motors. (400) initial requirment ,how are the 2 motors connected, are they in parallell. Cheers FB" Quote Link to comment Share on other sites More sharing options...
Paul Marsh Posted July 6, 2012 Share Posted July 6, 2012 They are in Parallel. If you connected it in series, the motors would run at half speed. Still have the orginal plane with motors, but they rattle a bit! Quote Link to comment Share on other sites More sharing options...
fly boy3 Posted July 6, 2012 Author Share Posted July 6, 2012 Thanks Paul for promt reply. May I ask what size ESC is required, and I was told the set up was for NmHd batteries. Can you confirm this Cheers Quote Link to comment Share on other sites More sharing options...
Chris Bott - Moderator Posted July 6, 2012 Share Posted July 6, 2012 FB3 my guess would be around a single 25A ESC or greater, and don't forget it has to be a BRUSHED type ESC. Getting rarer nowadays. Quote Link to comment Share on other sites More sharing options...
PatMc Posted July 6, 2012 Share Posted July 6, 2012 FB, I used to run mine on a 25A esc with 7 x 2400 Nicads, although this was adequate for aerobatics I used full power nearly all the time. Later changed to 8 x 2000 Nihms, still with the 25A esc but although I never had any problems with it it was probably close to it's limit. Having said that I was also able to use lower throttle than with 7 cells most of the time. The Nihm battery was also about 3 or 4 ozs lighter than the Nicad. PS - just checked a log I keep of all my motor tests (sad but true) & the Permax 6v 400 with Gunther prop as supplied with the TS took 10.2A with 7 cells & 12A with 8 cells. Edited By PatMc on 06/07/2012 21:58:55 Quote Link to comment Share on other sites More sharing options...
fly boy3 Posted July 6, 2012 Author Share Posted July 6, 2012 Cheers Chris, and you are right, they are scarce, but I have been lucky with some offers from very kind forum members, who I presume have gone brushless and have no further use for them, I'm most gratefull for these offers. Cheers ps Re my question to Paul would Nmh batteries be more usefull to these 400 brushed motors than Lipos ,due to their voltage requirements. ? Cheers Quote Link to comment Share on other sites More sharing options...
Paul Marsh Posted July 6, 2012 Share Posted July 6, 2012 I've got the orginal Mulitplex 35 ESC in it. Still full operational, and even used a 10 cell NIMH in it. Not sure if it or the motors would handle a 3S Lipo pack. Recently changed the very old GWS 35Mhz rx with a Spektrum 2.4 rx. Quote Link to comment Share on other sites More sharing options...
Mike Etheridge 1 Posted July 6, 2012 Share Posted July 6, 2012 My Twinstar 2 Ni Mh battery is shown below with 9 cells at 10.8 volts EMF . I have two other 9.6 volt packs with 8 cells. I must say that over the last 6 years or so the Twinstar 2 has had many flights and is ideal to fly after winter lay-offs to get over 'flying rustyness'. Edited By Mike Etheridge 1 on 06/07/2012 22:07:44 Quote Link to comment Share on other sites More sharing options...
Trevor Crook Posted July 6, 2012 Share Posted July 6, 2012 I've flown a MPX Cargo with geared 400s on a 3s LiPo, without problems. Mind you, it was only on full power for take-off, but I'm sure the Twinstar would fly on reduced power most of the time. Things to be careful of are the c of g, as even a big LiPo will be lighter than Nickel cells, and probable lack of LiPo compatibility on the ESCs low voltage cut-off. This isn't a problem if you set up your flight times carefully, though. The original Twinstar was a real breakthough model, with decent performance and duration using those old motors and cells. Good luck! Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted July 7, 2012 Share Posted July 7, 2012 I upgraded my original twin star to 3s lipo, first problem was the original props which flew off with teh higher revs, so I replaced them with a couple of prop adaptors and a couple of 6 x 4 (I think) props, it went really well until one of the motors burnt out, but it's hard to resist the extra power . Mines now upgrades to brushless with rudder throttle mixing and a tail dragger undercarriage. Hasn't flown for a while now. Quote Link to comment Share on other sites More sharing options...
Gaz Elliott Posted July 7, 2012 Share Posted July 7, 2012 Yeah I did the same with mine. 3cell lipo for power , but soon burnt the6v motors. Upgraded motors and esc ( two of each motor and esc) cost about £40 from the cod as was. Still flies well and is fastest twin on the patch. Has been redesigned due to magnetic earth !!!!! Still flies well. Quote Link to comment Share on other sites More sharing options...
Mike Etheridge 1 Posted July 7, 2012 Share Posted July 7, 2012 The heavy Ni mH battery packs are ideal due to their weight for instances when you need for the Twinstar to penetrate when its windy. I seem to remember my nephew adding loads of lead ballast in his slope soarers for the same reason. I have been 'too tight' to think about swapping the Ni mH batteries for lipos but have always found that the Twinstar 2 flies pretty fast with the original motor and battery set up. However the climb rate is not fantastic. I have been offered a free original unused Twinstar but have yet to collect it. I did find with the Twinstar 2 that the C/G position was too far back and I had to move the batterie(s) forward for it to fly OK. I have replaced the brushed motors once to date. MJE Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted July 7, 2012 Share Posted July 7, 2012 Posted by Mike Etheridge 1 on 07/07/2012 10:49:02: The heavy Ni mH battery packs are ideal due to their weight for instances when you need for the Twinstar to penetrate when its windy. I seem to remember my nephew adding loads of lead ballast in his slope soarers for the same reason. I have been 'too tight' to think about swapping the Ni mH batteries for lipos but have always found that the Twinstar 2 flies pretty fast with the original motor and battery set up. However the climb rate is not fantastic. Using a 4,000 mah 3s battery helps and does wonders for the duration and climb rate Quote Link to comment Share on other sites More sharing options...
fly boy3 Posted July 7, 2012 Author Share Posted July 7, 2012 Thanks all for answering my queries on the Twin Star power train.I will probably still use the Nmh cells as the extra weight will be beneficial and I have them at hand. Cheers FB3 Quote Link to comment Share on other sites More sharing options...
Toni Reynaud Posted July 7, 2012 Share Posted July 7, 2012 Consider putting 7.2V Speed 480 motors in when the 400s burn out. With the 3S LiPo it gives a massive performance gain. Quote Link to comment Share on other sites More sharing options...
fly boy3 Posted July 7, 2012 Author Share Posted July 7, 2012 Thanks Tony ,will keep that in mind, for a possible upgrade. Checked internet and they seem quite cheap.Thats my type of motor. Cheers Quote Link to comment Share on other sites More sharing options...
JOHN PENNY 1 Posted November 28, 2022 Share Posted November 28, 2022 Could I use a 12c 3000 11.1v lipo for my brushed motor setup please. I am new to foamies obviously Quote Link to comment Share on other sites More sharing options...
PatMc Posted November 28, 2022 Share Posted November 28, 2022 No, the voltage is too high for the standard brushed motors. The motors would burn out very quickly as they are only rated for around 8.4v with the standard size props. Quote Link to comment Share on other sites More sharing options...
J D 8 Posted November 28, 2022 Share Posted November 28, 2022 Could be fine with a 7.4v lipo, lighter than a NMH for similar capacity. 1 Quote Link to comment Share on other sites More sharing options...
JOHN PENNY 1 Posted November 28, 2022 Share Posted November 28, 2022 thanks for all your replies, now going 7.4 lipo and 30 amp brushed esc 1 Quote Link to comment Share on other sites More sharing options...
Eric Robson Posted November 28, 2022 Share Posted November 28, 2022 Hi John, I am not certain but I have heard that using a lipo with a brushed esc can destroy the battery as the power cut off is lower than the safe cut off for a lipo. I may be out of date with this but it is worth checking. Quote Link to comment Share on other sites More sharing options...
Frank Skilbeck Posted November 29, 2022 Share Posted November 29, 2022 Eric, you are correct unless the ESC has a Lipo setting, but that wasn't something older brushed controllers had. But if you fly conservatively and land before you've used the battery capacity it's not a problem. 1 1 Quote Link to comment Share on other sites More sharing options...
Geoff S Posted November 29, 2022 Share Posted November 29, 2022 2 hours ago, Frank Skilbeck said: Eric, you are correct unless the ESC has a Lipo setting, but that wasn't something older brushed controllers had. But if you fly conservatively and land before you've used the battery capacity it's not a problem. I don't recall ever flying a model right up to the point the esc cut the power to protect the battery. It's worth being aware of but not really a problem. Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted November 29, 2022 Share Posted November 29, 2022 I had this on my 3s concorde,, Robbe 8636 and still have it,, Quote Link to comment Share on other sites More sharing options...
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