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"My first flywheel" New Questions
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Welshnerfer
Regular Member


Joined: 25 Aug 2012
Posts: 106



Post "My first flywheel" New Questions  Reply with quote
Evening all,

Got a few questions. Got myself a pair of Rhino's from someone on Nerf UK BST on Facebook, and now I'm just placing my order with HobbyKing for Lipo/Charger etc, and I wanted to ask a few questions before I hit the go button, just to clarify a few things in my head.

So firstly, is there much of a difference between a MOSFET like the one in BSUK's wiring loom kit, or a 15a microswitch a la MTB's Demolisher build, and if so, is there a better option to go for, and perhaps more importantly, for my first electric blaster, which one is going to be simpler to do.

Secondly, I know MTB's vid about batteries and motors they mentioned a LiPo alarm/voltmeter, are they essential, or can I leave them out, and if they are needed, how do I go about wiring one in to my loop?

Thirdly, as I'm building a Demolisher, there's a clip at the base of the grip that splits the wiring in both halves of the shell. I'm planning on replicating this with some XT60 connectors. My question is, will this affect the performance of the blaster, (less breaks, less places for power to leak?) and if not, is it sensible? I want to be able to split both halves of the blaster if I need to work on the blaster (uprate motors, cosmetic mods etc.) further down the line.

Thank you all in advance, and hopefully I'll have this bad boy up and running by BoB!
Thu Jun 22, 2017 7:58 pm View user's profile Send private message
Ratman99UK
Junior Member


Joined: 04 Apr 2017
Posts: 77
Fav. Blaster: Stryfe
Location: Lichfield UK



Post Reply with quote
Since your talking a demolisher (stryfe reshell), your better off rewiring and using a 10A switch. blaster smiths have the switches (https://blastersmiths.co.uk/products/10a-lever-microswitch) and the wire you can get from Maplin or where ever (16 gauge).

a mosfet will allow you to keep the crappy stock wiring to the switch and locks etc. the mosfet works like a switch, so the low power side can turn the switch on to the high power side. I used this setup in a stampede kit from blastersmiths. That being said the wiring in a stryfe / stryfe reshell is mega simple so its easier to rewire and use a good 10A switch.

a lipo alarm monitors the voltage of the lipo cells (your talking 3s on rhinos) so you have 3 cells which it monitors. A lipo cell will suffer unrepairanble damage if it drops below 3.1v and a lipo alarm will go off if the cell drops to 3.3v. i personally have this alarm:
http://www.ebay.co.uk/itm/2-3S-RC...tage-Alarm-Indicator/181995228452

they connect directly to the balance lead (the smaller cable used to charge it) of the lipo. iv got the alarm in the handle and this 3s extension cable to run it upto the battery bay
http://www.ebay.co.uk/itm/Lipo-Ba...5s-6s-Turnigy-Zippy-/142263687098

the brake in the cable to both half's will effect resistance but not enough that you would notice it.
An XT60 can handle 60A of current.

--edit--

your also going to need an extended battery door to house the size of 3s cell your going to need for the job. User OldNoob pointed me in the direction of the blastersmiths battery guide which recommends this 3s:
https://hobbyking.com/en_us/zippy...act-1000mah-3s-35c-lipo-pack.html
this is the one im using and its quite large.

this is the blaster smiths battery bay extender:
https://blastersmiths.co.uk/products/demolisher-battery-tray-expander

---- NOTE im dyslexic and this is mostly red underlines so let me know if you cant read some of my spelling ----


Last edited by Ratman99UK on Thu Jun 22, 2017 9:04 pm; edited 1 time in total
Thu Jun 22, 2017 8:43 pm View user's profile Send private message
OldNoob
Foam Data Collector


Joined: 07 May 2013
Posts: 4868
Fav. Blaster: Xtreme 180 Rapidstrike
Location: In the Boonies



Post Reply with quote
Go for a MOSFET if you can, it allows future exansion and upgrade without significant wiring changes.

You don't need a Lipo alarm, if you have a properly sized lipo, like the one lnked on BSUK!s website and in the motor and battery combination chart, you will never get it anywhere near flat. I never use lipo alarms. I have never had a pack drop below 3.5v per cell even over 3 full BB style games. If you are using a Demolisher you will need a demolisher tray expander for 3s and I would buy a lipo at about 750mah minimum, Tattu or Graphene.

If you use a MOSFET you won't need to mess with that plug, watch my Demolisher MOSFET video you will see that plug only has low voltage in it and you use a Deans up front to carry the high current from the battery.

Ratman- you are wrong about a 10A switch restricting the current to 10A, that is just the nominal max load, a switch is a pair of contacts, it will carry as much current as the rest of the circuit, up until the point the contacts melt. I have seen a Cherry DC2 take burst loads if 60A.  Also good connectors have a resistance of about the same as a length of wire. Please get your facts straight or only advise on things you know for certain.

_________________
Big_Poppa_Nerf wrote:

Boff whats the damage? I have spent over 3 times my Nerf budget this month already. Part of me is trying to be a responsible parent/husband/house owner. The other half is just says 'Ahhhh, Screw it!'.
Thu Jun 22, 2017 9:00 pm View user's profile Send private message Send e-mail
Ratman99UK
Junior Member


Joined: 04 Apr 2017
Posts: 77
Fav. Blaster: Stryfe
Location: Lichfield UK



Post Reply with quote
OldNoob wrote:
get your facts straight or only advise on things you know for certain.


Updated. is everything else ok? i just had a look and the demolisher has a plastic plate in the back that cant be removed without heating it (like plastic melted sealed). that seems like it would be a pain just get at the wiring, which I guess would support the MOSFET route.

---edit---
here is the blastersmiths chart we are both talking about:
https://docs.google.com/spreadshe...15_a8eSWSx5IGaD5djMTHE/edit#gid=0


EDIT

Snipped down quote- rule of thumb is quoted text should be shorter than reply, even I am not that interesting.ON


Thu Jun 22, 2017 9:08 pm View user's profile Send private message
OldNoob
Foam Data Collector


Joined: 07 May 2013
Posts: 4868
Fav. Blaster: Xtreme 180 Rapidstrike
Location: In the Boonies



Post Reply with quote
Boff has direct wires a Demolisher, it's on Britnerf somewhere. A MOSFET is cleaner and easier. I hate the double shell in the demo. Makes the wiring runs trickier.



_________________
Big_Poppa_Nerf wrote:

Boff whats the damage? I have spent over 3 times my Nerf budget this month already. Part of me is trying to be a responsible parent/husband/house owner. The other half is just says 'Ahhhh, Screw it!'.
Thu Jun 22, 2017 9:24 pm View user's profile Send private message Send e-mail
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