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Official Freewing MiG-29 Fulcrum Twin 80mm Thread
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Originally posted by GliderGuy View Post
Careful….I intended to state others have PARALLELED batteries on similar systems as the MiG. Hopefully this clears up my statements.
Sorry that I wasn’t more clear.
If you leave the MiG stock….without paralleling the battery connections…and mix different capacity batteries, that would be a disaster.
-GG
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Originally posted by dabevan View PostJust to be clear (again) my original question was asking *if* the MiG was wired in parallel - in which case I was going to run different sized packs (which is perfectly OK!) *if* it's not parallel (which people are saying it's not) then I'll either run identical packs or solder the wires so they are parallel.
I was *never* suggesting running two different pack sizes in a non-parallel set up. (that would be silly.)
I was *never* asking if two parallel packs could be different sizes, as I already know the answer (yes they can)
...thanks for the replies though!
Dave
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Originally posted by dabevan View PostTwo batteries in parallel will have their voltages pinned to each other as the two pos+ will be connected and the two neg- connected. Therefore it is impossible for one to discharge more than the other one. What will happen in practice is that in order to keep this voltage the same the larger pack will supply more current than the smaller pack.
I mean, if you are making it parallel, you will be running all the current through a single set of wires instead of two... current will come from both batteries and add up to supply the total amount demanded by the sum of the two EDFs. This means that the section where all the current is flowing through just 2 wires (instead of 4) will need to be able to handle much higher currents, so you will need to size it accordingly and increase the wire gauge so it doesn't lose too much energy overheating. Sure, most twin-EDF setups with a single battery operate that way, but I don't quite see the point of doing this for the MiG-29. I mean, if you were considering using them in series, then totally as that allows to reduce wire gauge while outputting the same power (higher voltage, less current, Joule effect), so you deliver more power with less energy losses and save weight while at it... but... why parallel? what is the gain?
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Hi Dave, may I ask what is the point of running the parallel setup you suggest?
If I make the wires parallel then I'll retain both sets of wires and put a set of jumper wires between the two. These will only need to handle the difference in current between the two packs, not double as you suggest.
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Dave,
Did you see my response to you on Facebook where I posted the two sets of connectors you'd need to do what you're trying to accomplish? You need a parallel adapter to hook the batteries together, and then a splitter (one source to two loads) to hook the two ESC/motor plugs to.
Parallel Adapter - https://www.motionrc.com/products/be...39935839436985
Splitter - https://www.motionrc.com/products/be...39935861620921Pat
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Originally posted by dabevan View Post
So that I can use different capacity packs (please don't tell me this is not recommended etc - it's fine)
If I make the wires parallel then I'll retain both sets of wires and put a set of jumper wires between the two. These will only need to handle the difference in current between the two packs, not double as you suggest.
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Originally posted by dabevan View PostSo that I can use different capacity packs (please don't tell me this is not recommended etc - it's fine)
If I make the wires parallel then I'll retain both sets of wires and put a set of jumper wires between the two. These will only need to handle the difference in current between the two packs, not double as you suggest.
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Originally posted by lusek_pl View PostI need help before the model comes, i would like to make a stand under it. Someone can give up put size on the basis of their stands?
My work stand for this plane is one of those that the end supports can slide to make the space in between anything I need it to be.
ANY PRODUCT AVAILABLE FOR BACK-ORDER IS A PRODUCT WE INTEND TO CARRY MOVING FORWARD BUT ARE CURRENTLY OUT OF STOCK. YOU CAN PLACE BACK-ORDERS FOR THESE ITEMS. THIS LIST MAY BE ADJUSTED AS WE MOVE FORWARD. Super Stand II (each) Fully Adjustable Model Stand and Work Station. Fits any size airplane from small gliders to G
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Originally posted by lusek_pl View PostI need help before the model comes, i would like to make a stand under it. Someone can give up put size on the basis of their stands?
Hugh "Wildman" Wiedman
Hangar: FL/FW: Mig 29 "Cobra", A-10 Arctic, F18 Canadian & Tiger Meet, F16 Wild Weasel, F4 Phantom & Blue Angel, 1600 Corsair & Spitfire, Olive B-24, Stinger 90, Red Avanti. Extreme Flight-FW-190 Red Tulip, Slick 60, 60" Extra 300 V2, 62" MXS Heavy Metal, MXS Green, & Demonstrator. FMS-1700mm P-51, Red Bull Corsair. E-Flite-70mm twin SU-30, Beast Bi-Plane 60", P2 Bi-Plane, P-51.
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Originally posted by Airguardian View PostMy two cents: Don't make a stand from scratch, use the foam from the packaging box. You cut openings for the wings and stabs and it doubles up as transport box to the field and plane stand.
Sometimes take the plane too........
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Think I was a bit hard on Motion RC Europe .,When I brought this on the forum both James and Jarrett at MRC Europe have been great and work their socks off to sort tis problem out I now think this could be resolved
Just like to thank Jarrett and James for their response to this problem and also how quick they reacted
Thanks James and Jarrett you have restored my faith in Motion RC👍👍
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Originally posted by Captain Moron View PostCome on Motion RC this is not the way to treat your customer .Order a Mig 29 from Motion RC Europe Fed Ex are unable to do a simple task of deliver this parcel to my address .Contacted Motion RC .Received one email from saying they would look into this .Then nothing then found out they had closed the case .Now I can not get in contact with them .They are impossible to contact. So it looks like I have ended up with no Mig 29 and out of pocket by 585 euros and on top off that just received a bill for VAT and handling charge from Fed Ex for £118 for a model I never received .Thanks Motion RC great Customer Service
I found the ticket in the system and there is an internal dialogue between Jarrett and the Warehouse. Looks like it was closed in error. Someone should replay to you today
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Originally posted by Captain Moron View PostCome on Motion RC this is not the way to treat your customer .Order a Mig 29 from Motion RC Europe Fed Ex are unable to do a simple task of deliver this parcel to my address .Contacted Motion RC .Received one email from saying they would look into this .Then nothing then found out they had closed the case .Now I can not get in contact with them .They are impossible to contact. So it looks like I have ended up with no Mig 29 and out of pocket by 585 euros and on top off that just received a bill for VAT and handling charge from Fed Ex for £118 for a model I never received .Thanks Motion RC great Customer Service4QR1HU9N7
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