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Blade mCPX › McpX - 120 SR tail mod
06-08-2012 03:18 AM  6 years agoPost 1
Timtreo

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Warminster, PA USA

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Hi all, I was trying to do the 120 sr tail conversion on the McpX today and smoked a mosfet. I followed a video on youtube and the guy said to make sure the red dot on the plug goes to the inside (which would be opposite of the green dot on the McpX receptical) Well on spool up - poof! Is this the right way to make the connection? Also I've never understood how those metal tail wires are insulated from each other. I am using a metal tail boom but I didn't have any shorting out with the stock tail motor wires??? The McpX is all stock and the tail just wasn't holding well at all even with a new stock tail motor and (I think) extended tail boom. How long is an extented tail boom exactly?
I have a spare mosfet but never attempted to solder anything that small. Any advise?
Now that I'm reading more about the 120 tail conversion on here I'm thinking it might not even be worth it for a stock setup because of the weight. I have to figure this tail authority problem out somehow though because I do love this little mosquito.
Thanks for any advise on the matter. Tim

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06-08-2012 12:12 PM  6 years agoPost 2
TurboRacer

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Yeah, 120 tail is overkill for stock motor. From what I hear it just doesn't work. Never tried on a stock motor. I found the stock tail motor worked fine on stock and mild brushless. Now I have TA915 and *need* the 120SR tail.

You should be OK with just lengthening the tail boom. Horizon actually makes an extended boom now. As for the wires - they're coated, just lightly. They probably got a scratch or something and touched.

Contact jollyllama here - he can fix the FET for you if you don't have the tools to do it yourself.

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06-08-2012 03:26 PM  6 years agoPost 3
Timtreo

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Warminster, PA USA

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Ok, yeah I might have scratched the wires jamming the metal tail boom in. Thanks for the clue on that one.
Does anyone know how long an extended tail boom is? I ordered mine from ebay and I don't know if they gave my the right one, mine is 5 1/4" - 130mm end to end.
Also anyone know if the red mark (+ wire) should go to the inside (opposite the green mark) on the McpX receptical for the 120 tail? I have all the parts and the McpX apart so I guess I might as well try it, but I don't want to burn out another mosfet. Thanks again all. Tim

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06-09-2012 08:04 PM  6 years agoPost 4
Timtreo

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Warminster, PA USA

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Ok, I got the fet soldered back on and put on the 120 tail with whatever size boom I have. Using a microheli 550mAh battery stuck in through the front it balances and the tail holds great! It is heavy though for a stock motor but I'm not quite ready for any kind of 3D flying yet so it just cruises around great.
One thing though is I have to put the 120 tail angled down so it is on the right side on the McpX. Is that normal for this mod? The tail fin is now even too short that the tail blades will scrape the ground. I had to hand launch it for the test flight. Is there anyway to get it angled up and spinning correctly? BTW - I am using the strange looking Walkera tail blade recommended for this McpX mod. Thanks for any insight, Tim.

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06-10-2012 07:18 PM  6 years agoPost 5
srgfitness

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west chester pa usa

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Tail rotor
Tim,
put tail on facing up and then take the tail plug out of the socket on the board and turn it 180 degrees and plug it back in.
That will get rotor spinning in right direction.
--Scott

When possible shoot first. When that isn't possible shoot fast.

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06-10-2012 08:10 PM  6 years agoPost 6
Timtreo

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Warminster, PA USA

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Oooo, ok you sure? I did burn up the mosfet the first time I plugged it in that way, but like TurboRacer said above it could have been that I scraped the some of the coating off the wires jamming the metal tail boom into the motor mount and shorted it out. To be honest I think I might ditch the whole 120 tail idea. It is holding great but but the wieght of it and the 550mAh battery is really straining the stock motor on climb outs. I wish I could get the stock tail to hold well. Thanks for the response.

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06-10-2012 09:27 PM  6 years agoPost 7
srgfitness

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west chester pa usa

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Tail Rotor
I found that the dot on the male connector was backwards so when I reversed it, it ran the right way.
Sounds like you shorted yours on the metal tail. You should look at the "calmer" of the two brushless motors Wow Hobbies sells. The kit I bought required no soldering.

When possible shoot first. When that isn't possible shoot fast.

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06-10-2012 10:10 PM  6 years agoPost 8
Timtreo

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Warminster, PA USA

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Ok thanks srgfitness. I looked at those kits but I'm not ready to put over $100 into this little guy. I bought it used for $50 just to see what all fascination was about with the McpX and I do love it and think it's a great learning tool but I'm not that hardcore into it. I have a couple other builds going on and all my play money is tied up in them. I did see when I was on wows site that the extended booms come in lengths longer than the one I have so I'll try that next with the stock motor back on. Thanks again for your responses. Tim

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06-11-2012 11:26 PM  6 years agoPost 9
TurboRacer

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The kits are overpriced anyway.

You can get the M5 and flashed ESC for like $40-50 and keep the stock tail. It's much better than stock and still as durable.

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06-12-2012 05:08 AM  6 years agoPost 10
Timtreo

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Warminster, PA USA

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Hey thanks for the tip Turbo, that seems like a more resonable price. Do you have a link where I can get them? It might be worth keeping the 120 tail on if that is a more powerful motor setup because it does hold great. The stock motor is just under powered for the weight of it and the 550mAh battery now.

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06-12-2012 03:04 PM  6 years agoPost 11
TurboRacer

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You don't want the 120 motor unless you go with a big brushless. I flew the M5 for a couple months with stock tail motor - it's fine. You can go up to a 7mm tail motor and still be fine. The SR120 motor is just too heavy. Works well with my 915 setup, but that has gobs of power.

Check clubheli.com or astroid-designs.myshopify.com

Should be able to find what you're looking for.

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06-12-2012 06:37 PM  6 years agoPost 12
Timtreo

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Warminster, PA USA

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Ok thanks for the advise TR and I'll check those places out. Tim

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06-12-2012 07:50 PM  6 years agoPost 13
Timtreo

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Warminster, PA USA

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Just ordered the M5 and 10 amp brushless converter and 135mm tail boom from ClubHeli. Thanks again guys. I'll post how it works out. Tim

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06-12-2012 08:56 PM  6 years agoPost 14
TurboRacer

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Good job, you will like it better than stock
Good luck

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06-16-2012 06:43 PM  6 years agoPost 15
Timtreo

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Warminster, PA USA

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Hey TR, what pinion size would you think would be best for the M5 motor? I got 8, 9, 10T pinions.

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06-18-2012 04:59 AM  6 years agoPost 16
TurboRacer

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I was using 8. I hear 9 will bog it..

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06-18-2012 07:10 AM  6 years agoPost 17
Timtreo

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Warminster, PA USA

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Yeah I ended up using the 8 also. I put the 9 on and it just slipped right over the shaft with play. The 8 started spinning on the shaft too so I puy a dab of solder on it and it seems to be holding. The M5 is good but I have to get rid of the 120 tail. It is even kicking out now on hard pitch pumps, probably just too much mass back there (like you said before). I'll go back to the stock with the extended boom and try tweaking the pitch on the kbdd tail blade. I can tell the M5 will be way better than stock once I drop the 120 tail weight and go back to the 300mAh batteries.

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06-18-2012 02:04 PM  6 years agoPost 18
TurboRacer

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Yep, too much weight.

When I had M5, the 300 nanotechs and stock tail motor/extended boom was the best.

With the TA915 the SR120 and 550's are perfect. It's heavy, but it still flies insane. hahaa

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06-19-2012 02:55 PM  6 years agoPost 19
Timtreo

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Warminster, PA USA

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Fried another tail fet putting the stock motor back on... I don't think these metal tail booms are a good idea with the way the tail wires go through tail motor mount bracket. Or actually the way the wires go through the motor mount is a bad idea. Now I have to wait for a delivery.

EDIT - On second thought I guess it's just me being lazy that's a bad idea. Instead of desoldering and resoldering the wires I was just jamming the tail boom in and wrapping the wires around the tail up to the board...

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06-19-2012 04:16 PM  6 years agoPost 20
TurboRacer

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Yeah, you should go on the outside of the boom. Also, you can use the wires from Cat5 cable as a heavier duty replacement. The silicone coating on stock tail motors is pretty thin..

Here's how I have mine run:

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