Thread Tools
Dec 02, 2019, 05:29 PM
Registered User
Thread OP
The fans are pulling 50a each one, I haven't bought the batteries yet i think i can consider 5s.
The expeted weight
is around 1700g this give a 0.8 to 1 thrusth to weight ratio, 1200w total
Last edited by Nitrox416; Dec 02, 2019 at 06:18 PM.
Sign up now
to remove ads between posts
Dec 03, 2019, 08:48 PM
Registered User
a little bit heavier than a 4500 4s pack (by about 150g) but it'll give you a fair bit of extra oomph
https://www.dinogylipos.com/collecti...s-70c-graphene

or if you're really concerned about weight:
https://www.dinogylipos.com/collecti...nt=21047096069
its only 40-50g heavier than most HK 4500 4s packs

however given the size of this model even with 4000mah packs, i think you'd easily still see 4min flights, i don't think at cruising power you'll use that much power.

i just googled the setup your using... its claiming 1250g of thrust each... you are a long way down on that.... seems odd... fair enough i wouldn't expect the full 1250, but 1000g seems reasonable
link:
https://www.ebay.com.au/itm/QX-Motor...-/232651948944
Last edited by XCSEDAN; Dec 03, 2019 at 10:30 PM.
Dec 04, 2019, 03:53 AM
Registered User
Thread OP
Thank you for help
I have to consider 5s for sure, because i was expecting something around 1000g too. When i test the fan out of the plane with intake lip they both made 49A and 650 w ca so close to what declared. Before blaiming the intake system i will check the measurement system. I don't know if the use of two old rc car packs in series to make 4s can also play a role.

Update,
ok they definitely play a role in performance, i tried only one motor a time and the thrust reaches 900g for each fan, with batteries to 80%. I wouldn't believe that some years of modified touring car would cause this weakness. ok so probably I have to go with high C batteries,
Thank you for brainstorming XCSEDAN
Last edited by Nitrox416; Dec 04, 2019 at 06:22 AM.
Dec 04, 2019, 05:32 PM
Registered User
ok its definitely got dead packs then... i reckon the fans will make more power when on a new pack.
try ordering some high quality high performance 4s packs, and i think you will be absolutely fine, i think you'll pull over 900g.

these are only 20g heaving than 4500 nanotechs and you'll get serious performance and an additional 500mah to play with
https://www.dinogylipos.com/collecti...s-70c-graphene

or if you really wanna go light they do the 4000mah version. (which will save you 50 or so grams)
depending how the batteries were treated charged and discharged will have massive impacts on their total life... i got stung pretty hard with some packs that should have been good but i left on a shelf for a little too long without cycling, and it hurt their long term performance, after cycling them 5 times they came back to about 80% but eh... they're just spare packs now...

sounds like theres no point with 5s, just stick to 4s 5s would put the amps through the roof i feel (with new packs)
and no worries mate, more than welcome
me personally, i would get the 4s 5000mah 70c G2 dinogy packs and be done with it, or 2x Dinogy 2200 4s G2 70c and run the motors off their own packs if its more conveiniant.
Last edited by XCSEDAN; Dec 04, 2019 at 05:44 PM.
Dec 17, 2019, 09:17 AM
Registered User
Thread OP
Busy times but not on planes unfortunately, some updates for the gear structures that was too weak and probably not able to handle landing, now the structure is more of solid balsa wood than in foam.
Hope to fly in january, still a lot to do.
Dec 24, 2019, 01:14 PM
3d and EDF, some scale
MustangAce17's Avatar
Really like this build! I would buy a set of plans
Dec 24, 2019, 05:34 PM
Registered User
Thread OP
Thank you very much, don't worry at the end of the built I will upload the plans.
Dec 25, 2019, 08:58 AM
3d and EDF, some scale
MustangAce17's Avatar
Awesome, I have a pair of 70mm needing a home so I will scale it up a bit
Dec 25, 2019, 02:56 PM
Registered User
Thread OP
wow it will be a real monster.
Here are the plans I work with if you want to study them, I wish to make some little modifications I found necessary but I have no time right now unfortunately.


Quick Reply
Message:

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Jackal Twin - compact 1m span twin-engined COIN style parkflyer. Plans & Video. WMD Foamies (Scratchbuilt) 496 Jul 22, 2016 06:28 AM
Discussion twin 64mm EDF ARF plane recomendations strykerf27q Foamy EDFs 9 Mar 04, 2016 07:40 PM
Build Log Basalt, 1m Span Canard-Twin, with plans. TeamWang Foamies (Scratchbuilt) 18 Oct 29, 2015 10:46 AM