Experiments with TC

[paul2566]

E3Nomad

Excellent, I see you spaced your coils, may I ask why you chose to do it that way.

I may be wrong, but from what I've read, the current should mostly run through the low resistance Ni200, with the wrap just bulking it out. I find it quite difficult to make spaced claptons, which it partly why I went contact coils.

Good skills wrapping single strand Ni200, that stuff is pretty fragile.

Hopefully others will add their experiences to the thread

 

[E3Nomad]

E3Nomad

Excellent, I see you spaced your coils, may I ask why you chose to do it that way. /..............

Chose? Aw c'mon, it's the world's laziest vaper you're talking to! It came out spaced because of the material's springitude and I couldn't be bothered to do owt about it. Actually, I prefer spaced coils - they seem to maximise surface area and allow a good flow of juice from the wick. Regarding your observation on current, run this build through Steam Engine and try substituting 32awg kanthal for 34awg kanthal as the wrap. You'd expect this to marginally increase resistance, but it doesn't - quite the reverse, in fact. So yeah, you could probably wrap your core in tinfoil and it'd have little effect on resistance, unless of course it blew up first.***Note: I am not advocating this approach and I strongly recommend against trying it***

 

[paul2566]

Ok,

Try as i might I cant wrap single strand Ni200, I'm too ham fisted and it keeps breaking.

So, tried a different tack.

Single coil, on the Velocity, loads of room to spare.
Twisted
Ni200 0.27mm
Kanthal 0.42 mm

I twisted the hell out of it figuring the kanthal would prevent the Ni200 shorting out due to the disparate diameters of wire.

8.5 wraps around a 2.5mm mandrel, touching coils.

It comes in at 0.17 ohms.

On the Sigelei at 170degrees C and 50 Joules.

Really nice flavour and moderate clouds.

TC works and vaped it pretty much dry, with the cotton just off white. No burning detected.

 

[E3Nomad]

Ok,

Try as i might I cant wrap single strand Ni200, I'm too ham fisted and it keeps breaking.

So, tried a different tack.

Nice one! See you've taken a leaf from the Electron's Guide to the Galaxy and followed the path of least resistance! I am but a wee thing with a lifetime of playing with bits of nautical string, which is perhaps an unfair advantage, but I'm pleased you had another go at it.

 

[E3Nomad]

I came to my senses and replaced the dodgy ol' Magma with a Tsunami 22mm, transferring that Ni200 clapton before consigning the Magma to the trash bin. Tried first on an iStick Pico, and after on an IPV D2, both set to manufacturers Ni TC setting. Results are consistent and what an improvement! Resistance showing at 0.09 ohms, a spit 'n a fart off SE's calc. Airflow wide open and pushed it to 65 watts on the Pico & 50 Joules (max) on the D2. Competition clouds with my 80VG vanilla custard but flavour muted and things getting too warm for me at highest settings. Backed off to 35/40 watts on both mods and closing airflow to about 60%, clouds are reduced but still dense and flavour is good - not the best I've had, but good enough for a warmish all-evening vape. Ramp up a little slow at 35 watts. TC working well at 215°C and no burning on dry vape. Although I'm no fan of Ni200, this result was definitely worth the effort.

 

[paul2566]

Good skills.

I refused to give up on wrapping single Ni200, so I decided to go big or go home.

The result was................

 

[paul2566]

#6

Tobecco Velocity clone.
Air flow wide open.

SIGELEI 150W TC MOD

Clapton coil
I.D. of coil 2.5mm
Core = Ni200 0.4mm
Wrap = Kanthal 0.3mm
Coil wraps = 7.5

TCR pre-set by mod manufacturer

Mod set to 140 degrees C
Mod set to 70J
Coil reads 0.08 Ohms which is a little off with Steam Engine from their wire wizard page

Below is the info I got from the Steam Engine wire wizard..

Resistance 0.085 Ω
Resistivity 0.76 Ω/m
TCR in vaping range 6087 ×10-6
TC precision 515
Heat flux per Watt 0.92 mW/mm²
Heat capacity 288.76 mJ/K
Current per Volt 11.81 A
Power dissipated 100 %
Width 1 mm
Thickness 1 mm
Length 111.3 mm
Surface area 1087.24 mm²
Cross section area 0.2 mm²
Volume 85.04 mm³
Mass 628.82 mg
Density 7.39 g/ccm




My results;
Temp control seems to work. Vaped it dry, no dry hits but huge drop in flavour and clouds as I would expect towards the end.
Ramp up time s was for me not acceptable.
Good clouds.
Good flavour.
Pleasant warm vape.



I am again quite pleased with the way this vapes.

 

[E3Nomad]

#6
................../ My results;
Temp control seems to work. Vaped it dry, no dry hits but huge drop in flavour and clouds as I would expect towards the end.
Ramp up time s was for me not acceptable.
Good clouds.
Good flavour.
Pleasant warm vape. /...............

It's good to see you persisted. That's a helluva sturdy coil, with nearly twice the suface area of my build and more than twice the mass. Reckon you'll have to bump power up more to reduce ramp up times. How does it go at, say, 100 joules? Or more? Also a little surprised at your temp setting of 140°C. I know it's juice-dependant and a matter of personal preference, but I don't start to get "into the zone" until I'm up to 190°C and my preference is 215°C.

 

[paul2566]

If i go to 80 Joules the temp control spoils the vape, upping the temp to 170 C, cures this and ramp up is not bad, maybe 2 seconds or so. Not sure if I'm going to get burning though.

Still produces good flavour and the clouds are more plentiful.

100 Joules and 170 C and the temp control spoils the vape again. Upping temp to 190 C cures this. Ramp time is now pretty much non existent.

To my surprise there is still no burning.

Still good flavour and the clouds are how shall I put this, hardly stealthy.

 

[E3Nomad]

Attaboy!!! Grab that bull by the horns!