2 batteries or 1 for 2 edf’s - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
RCCanada - Canada's Radio Control Hobby Forum
Electric Jets Discuss electric jets in Canada.

Reply
 
Thread Tools Display Modes
Old 03-03-2021, 06:29 PM   #11
cessna180
RCC Senior Contributor
 
I am: mike z
Join Date: Jan 2014
Location: brownsville on
Radio of choice:
spectrum/futaba
# of RCs: 10

Feedback: 25 / 96%
Posts: 720
Total Props: 4
Re: 2 batteries or 1 for 2 edf’s


       Remove this ad - become a site supporter!
I am scratch ( most of my models ) building a profile F22. 42 inch ws. Trying desperately to have the gross flying weight at 2 kg. Plan on using 2 64 mm. fans. 6s 5000ma.
On my test stand I get 1200 watts,55amps, 1400 grams of thrust. Running 1 edf. Batteries are TP 55 C in perfect shape, IR all cells below 5. Like this one only edf.
Michael
Attached Thumbnails
Click image for larger version

Name:	B1E12333-E379-40A1-87D2-08F6E1619F06.jpeg
Views:	19
Size:	717.0 KB
ID:	1717425  
cessna180 is offline   Quick reply to this message.

Sponsored Links - Subscribe to remove this ad.
Old 03-03-2021, 06:41 PM   #12
4stripes
RCC Supreme Contributor
 
4stripes's Avatar
 
I am: Flyboy 1
Join Date: Feb 2007
Location: Earth

Feedback: 22 / 100%
Posts: 2,800
Total Props: 16
Re: 2 batteries or 1 for 2 edf’s

6S 64mm fans? That is an odd cell count for that size.
You say 2kg, that can’t include the battery since a 5000mah 6S pack weighs about 700-800g depending on C rating.
I think two 64 mm fans shouldn’t need more than 3500mah.
__________________
Zen thinking * It's rebuildable till it fits back in the box. **
Cheers
4stripes is offline   Quick reply to this message.
Old 03-03-2021, 07:37 PM   #13
stegl
RCC Supreme Contributor
 
I am: Len S
Join Date: Mar 2009
Location: Kelowna
Radio of choice:
DS16 And still use my trusty SD-10.
# of RCs: 10

Feedback: 194 / 100%
Posts: 7,753
Total Props: 53
Re: 2 batteries or 1 for 2 edf’s

Edf’s are usually always weight critical . I would compare the weight of two packs vs a single pack.
stegl is offline   Quick reply to this message.
 
Old 03-03-2021, 07:51 PM   #14
cessna180
RCC Senior Contributor
 
I am: mike z
Join Date: Jan 2014
Location: brownsville on
Radio of choice:
spectrum/futaba
# of RCs: 10

Feedback: 25 / 96%
Posts: 720
Total Props: 4
Re: 2 batteries or 1 for 2 edf’s

Thank you Flyboy. Yes very difficult to be under 2 kg. Yes I was thinking of using a 4000 ma. Battery. Never flown an edf I was wondering about the flight time. I just recently built a Yak 130 ,2 50 mm fans on 3200 ma. 4s. 2 1600 batteries in parallel 65C. 1500 grams gross flying weight. Have to wait till spring and have an expert to test fly it. The 64 mm fan is a QX.
Testing on the aircraft, both edf’s running, 65 amps. 950 watts, did not measure the thrust but specs say 950 grams each, may be optimistic.
Michael
Attached Thumbnails
Click image for larger version

Name:	43911FBC-3A51-457F-ACA4-B1A76E553742.jpeg
Views:	8
Size:	609.4 KB
ID:	1717435  
cessna180 is offline   Quick reply to this message.
Old 03-03-2021, 08:13 PM   #15
4stripes
RCC Supreme Contributor
 
4stripes's Avatar
 
I am: Flyboy 1
Join Date: Feb 2007
Location: Earth

Feedback: 22 / 100%
Posts: 2,800
Total Props: 16
Re: 2 batteries or 1 for 2 edf’s

Sounds like you are having fun!
A single battery of 3200 is lighter than two 1600 and will provide the same power and potential (assuming decent battery leads and connectors).
For 70mm twins or smaller, I think a single battery of the appropriate capacity is the most practical and efficient.
Good luck!
__________________
Zen thinking * It's rebuildable till it fits back in the box. **
Cheers
4stripes is offline   Quick reply to this message.
Old 03-03-2021, 08:38 PM   #16
cessna180
RCC Senior Contributor
 
I am: mike z
Join Date: Jan 2014
Location: brownsville on
Radio of choice:
spectrum/futaba
# of RCs: 10

Feedback: 25 / 96%
Posts: 720
Total Props: 4
Re: 2 batteries or 1 for 2 edf’s

Used 2 batteries as I use them for other builds and placement and c of g,2 work better.
Agree 1 battery easier and simpler. My concern as I mentioned before was 110 amp at WOT from 1 battery, need heavier wire and connectors. Maybe 1 battery for each edf only 55 amps. Also being new to edf’s trying to figure out battery capacity needed for 4 minutes of flight time.
Michael
Maybe if you are close you could test fly my Yak
cessna180 is offline   Quick reply to this message.
Old 03-03-2021, 09:45 PM   #17
4stripes
RCC Supreme Contributor
 
4stripes's Avatar
 
I am: Flyboy 1
Join Date: Feb 2007
Location: Earth

Feedback: 22 / 100%
Posts: 2,800
Total Props: 16
Re: 2 batteries or 1 for 2 edf’s

No worries Michael,
Either way works.
Do you fly much fixed wing? You don’t have to worry about flying EDF, so long as you understand the power is limited and not providing airflow over the wings.
I will gladly help you get your models set up and trimmed out. I fly in Burlington.
PM me your cell and I can get back to you.
Cheers Eric
__________________
Zen thinking * It's rebuildable till it fits back in the box. **
Cheers
4stripes is offline   Quick reply to this message.
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the RCCanada - Canada Radio Controlled Hobby Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Member names may only be composed of alpha-numeric characters. (A-Z and 0-9)

!!ATTENTION ADVERTISERS!! If you intend on advertising anything on this forum, whatsoever, you are required to first contact us here . Additionally, we do NOT allow BUSINESS NAMES unless you are an Authorized Vendor. If you own a business, and want to do sales on this site via posting or private message, you will need to follow the rules. Shops, Stores, Distributors, Group Buys without being authorized will see your account terminated.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Radio of choice?
Which radio is your current favorite to use?
Number of RC Vehicles?
How many boats, cars, planes do you own?

Log-in



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
vBulletin Message

Thread Tools
Display Modes

Forum Jump


All times are GMT -5. The time now is 05:25 AM.


vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.