BL upgrade just for the tail?

[muscleman]

I have a V1 MCPX and I found the stock tail motor to be crappy:
1. It gets over heated in just 1-2 minutes. Then the tail no longer holds when I hover. The longer I fly, the harder it is to hold.
2. When I suddenly push the throttle up, the tail blow is significant.

I am looking for a cheap conversion just for the tail, because the stock main motor seems to have sufficient power for my level.

Here is what I currently have, as the spare parts from another MCPX purchase:
tail motor:
http://www.banggood.com/Brushless-Up...X-p-76828.html

tail motor mount:
http://www.ebay.com/itm/Microheli-Bl...item5407508f6a

Here are my questions:
1. I found that the microheli tail mount is 8 mm while the brushless tail motor is only 6 mm. What kind of rubber tape or some kind of heat contract tube shall I use to increase the diameter of the tail motor?

2. Given my mcpx V1 frame's tail mount is 2 mm while the micro heli tail mount's tail boom size is 3mm, is the following the only choice for me for the tail boom?
http://www.ebay.com/itm/Microheli-Al...item5b107c6184

3. What ESC would you recommend?


Thanks a lot!

[JonJet]

In a stock mCPX with the brushed motor, you can go with a 7mm tail motor (and mount) or the 120SR 8.5mm tail motor and mount...

Xtreme makes tail motor mounts for both sizes

I've used both options, and they work out very well... controlling tail blowout is the key

[muscleman]

Am I better off to go with the 120 SR tail mod? Does that have the over heating issue as well?

[JonJet]

Originally Posted by muscleman

Am I better off to go with the 120 SR tail mod? Does that have the over heating issue as well?

The 120SR mod does just fine...as long as you run the wires under the boom and cover with shrink wrap so they don't get touched and short out, you'll be very pleased with the results

I've done many this way without a problem

[muscleman]

Originally Posted by JonJet

In a stock mCPX with the brushed motor, you can go with a 7mm tail motor (and mount) or the 120SR 8.5mm tail motor and mount...

Xtreme makes tail motor mounts for both sizes

I've used both options, and they work out very well... controlling tail blowout is the key

Thank you! I have three concerns with the 120 SR mod.
1. The tail boom is 3 mm instead of 2 mm, so how shall I fit it into the MCPX V1 frame?
http://www.ebay.com/itm/BLH3102-Tail...item43b9f817a0

2. I heard people saying that the 120 SR tail is pretty heavy. Do you have that problem balancing the weight of the heli?

3. Does it have the over heat problem after flying for a few minutes? Or you can keep changing batteries and keep flying for a whole day with no problem?

[JonJet]

You don't want to use BLH3102...you need a 2mm tail motor mount for the 8.5mm motor

I've flown battery after battery without an issue

[muscleman]

Originally Posted by JonJet

You don't want to use BLH3102...you need a 2mm tail motor mount for the 8.5mm motor

I've flown battery after battery without an issue

https://www.helifreak.com/showthread.php?t=330560

People are complaining that the 120 SR tail motor always wins at taking power from the stock main motor and they said it wouldn't be good to have the stock main motor/120 SR tail combo.

Do you have that problem or do you use a brushless main motor?

Regarding the tail mount, are you saying that I can just buy the 120 SR tail motor and fit it into my existing mcpx tail mount? The 120 SR tail motor's diameter looks bigger than the mcpx stock tail motor. I wonder if it could fit.

[JonJet]

Originally Posted by muscleman

https://www.helifreak.com/showthread.php?t=330560

People are complaining that the 120 SR tail motor always wins at taking power from the stock main motor and they said it wouldn't be good to have the stock main motor/120 SR tail combo.

Do you have that problem or do you use a brushless main motor?

Regarding the tail mount, are you saying that I can just buy the 120 SR tail motor and fit it into my existing mcpx tail mount? The 120 SR tail motor's diameter looks bigger than the mcpx stock tail motor. I wonder if it could fit.

I have and regularly fly brushed stock motors with the 120SR tail...and I don't have a problem with power loss, over-heating or balance...the AS3X does just fine.

Sure, a brushless main will do better, but you're talking frame mods and such...makes frame replacement a chore...

No, the stock 120SR tail should not be used...the boom is too large and the 2mm boom won't work.

You'll need a 2mm mount for the 8.5mm motor

[muscleman]

Got it! Can you tell me where I can get the 2mm mount for the 8.5 mm 120 SR tail?

[JonJet]

Originally Posted by muscleman

Got it! Can you tell me where I can get the 2mm mount for the 8.5 mm 120 SR tail?

Xtreme makes one design...

Shoot Me a PM if you want, I have a few here

[muscleman]

Since I already have the BL tail motor and mount, I also would like to weight the option of a BL tail vs 120 SR. Cost wise.

Can anyone please tell me which ESC shall I use just for the tail with the stock main motor?

[JonJet]

Originally Posted by muscleman

Since I already have the BL tail motor and mount, I also would like to weight the option of a BL tail vs 120 SR. Cost wise.

Can anyone please tell me which ESC shall I use just for the tail with the stock main motor?

I believe you'd want the XP3A...but not sure how it would work with brushed main and BL tail...odd combination

[2005h4]

Jon, what about wiring harness? do u use 120sr tail motor wires or mcpx tail motor wires? If u r to use 120sr wires, is it a direct fit to mcpx main board? If it is, plug to match the colors... red vs green??

[JonJet]

Originally Posted by 2005h4

Jon, what about wiring harness? do u use 120sr tail motor wires or mcpx tail motor wires? If u r to use 120sr wires, is it a direct fit to mcpx main board? If it is, plug to match the colors... red vs green??

You can use either type...

Motor rotation depends on the motor you use...a 120SR motor with the 120SR wire harness requires that one end be reversed...

The color mark on one end goes to the white side, but in all cases the tail motor propwash should blow toward you if the heli is sideways to you with the tail to your left (CCW rotation)

[2005h4]

Got it. thank you.

I have a spare 120sr tail motor with wire harness. I am going to use 2mm solid tail boom to try this mod.

[JonJet]

Be sure to position the board end with a strain-relief loop and use shoo goo or liquid tape to keep the plug from popping out during flight

[muscleman]

Sorry to ask these newbie questions, but I have two thoughts right now:
1. The main stock motor is actually not bad. 4200 RPM is not that much slower than a BL main motor, right? I saw some online videos and people usually set their BL main to have 4800 RPM. So 4200 is not that bad.
https://www.helifreak.com/showthread.php?t=326312
2. People say that the 130x main blades can give mcpx a feeling of a bigger heli and makes it more stable. I wonder if that could cause blade striks with the 120 SR tail motor and the 65 mm tail rotor? I am pretty interested in trying it out. Maybe I need to lower the head speed a little bit given the larger main blade, but that should make the heli quieter and more stable.

[JonJet]

Originally Posted by muscleman

Sorry to ask these newbie questions, but I have two thoughts right now:
1. The main stock motor is actually not bad. 4200 RPM is not that much slower than a BL main motor, right? I saw some online videos and people usually set their BL main to have 4800 RPM. So 4200 is not that bad.
https://www.helifreak.com/showthread.php?t=326312
2. People say that the 130x main blades can give mcpx a feeling of a bigger heli and makes it more stable. I wonder if that could cause blade striks with the 120 SR tail motor and the 65 mm tail rotor? I am pretty interested in trying it out. Maybe I need to lower the head speed a little bit given the larger main blade, but that should make the heli quieter and more stable.

130X blades might be a tad large...try the mCPX BL blades...they will clear the tail rotor

Have you ever tried a Deep-V throttle curve? (100-80-60-80-100)
If not, you should...even with an upgraded tail motor

You can use any drop number... 100-90-80-90-100 or 100-95-90-95-100...as long as it's equal...the right one for you will depend on your main motor

[muscleman]

Originally Posted by JonJet

130X blades might be a tad large...try the mCPX BL blades...they will clear the tail rotor

Have you ever tried a Deep-V throttle curve? (100-80-60-80-100)
If not, you should...even with an upgraded tail motor

You can use any drop number... 100-90-80-90-100 or 100-95-90-95-100...as long as it's equal...the right one for you will depend on your main motor

Thank you! I didn't know that MCPX BL blades are longer than MCPX V1.
Regarding the V curve, that's for stunt mode, right? Why not run the flat 100 curve?

[JonJet]

Originally Posted by muscleman

Thank you! I didn't know that MCPX BL blades are longer than MCPX V1.
Regarding the V curve, that's for stunt mode, right? Why not run the flat 100 curve?

The V-curve helps reduce the tail blowout in stunt mode

The more blowout you have, the deeper v-curve you need