Electric Aerobatic & Sport Planes Discuss rc electric aerobatics and rc sport flyers here.

Hangar 9 Pulse XT 40 -need a123 suggestions

Reply
Old 04-02-2009, 12:51 PM
  #1
wjbender
Thread Starter
 
Join Date: Jul 2007
Location: tinton falls, NJ
Posts: 65
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Hangar 9 Pulse XT 40 -need a123 suggestions

Hi all,

I'm building a Hangar 9 Pulse XT 40 with the electric option. I am looking to build a sport plane (not 3D) that will give strong aerobatic performance, yet disassemble easily for travel on commercial airliners. (vacation plane)


The advertised weight is 5 Lbs without battery, and The recommended motor is an E-Flight Power 46 motor with the following: specs:


925 Watts, 670 KV, weight 290 grams (10 oz) The suggested battery is 4200mAh 2S2P 7.4V Li-Po

If I want to use A123 cells, what configurations would give me equivalent or better performance?

I was thinking of using a 2S2P 4600Mah A123 pack. That pack would give me 5.9 V under load Vs 6.6 V for a loaded LiPo
Since the LiPo is approx 11.1% higher voltage under load, 11.1 x 670KV gives ~ 752 KV to get the same RPM

Should I consider using a motor with a higher KV to compensate for the lower battery voltage of LeFe cells or just change to a different prop?

How about a Scorpion SII-3026-890 KV (V2) with the following specs:

KV 980, 1025 watts, weight 205 grams


Would this work well? Does anyone have alternate motor suggestions using A123 batteries?


Thanks in advance for any comments or suggestions

wjbender is offline  
Reply With Quote
Old 04-02-2009, 02:00 PM
  #2
patnchris
 
patnchris's Avatar
 
Join Date: Jul 2006
Location: Gurnee, IL
Posts: 1,516
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Hangar 9 Pulse XT 40 -need a123 suggestions

I hope you read those spec. properly......That plane, with that motor requires 2 of those lipos.....I have this plane and fly it on a single 5S 4000 ma 15C pack....I'm using the Exceed MonsterPower 46 which has the same specs as the E-Flight Power 46......I realize you can pull some monster amps from those A123's but keep in mind that you will need at least 18-19 volts to pull the power you want. By the way....I don't know where you found the spec. on the E-Flight Power 46 but it is rated at 800 watts continous.....If you pull a constant 900 watts from it, it will burn up.....Ask me how I know....LOL....As far as the Scorpion motor goes, be very careful when reading their ratings.....They are not all that they say they are....Ask me how I know that.....

There are motors out there that will produce the watts you want with a higher KV....However the trade off would be more amps.....Truthfully....I've got mine propped for 850 watts at WOT, but seldom use it. The Pulse XT has a very slippery air frame and is quite fast. While I don't have unlimited vertical, I find I don't need it, because at the speed it flys, it doesn't need to go vertical very long before it's too high....Pat
patnchris is offline  
Reply With Quote
Old 04-02-2009, 02:51 PM
  #3
bobferguson
 
bobferguson's Avatar
 
Join Date: Jun 2003
Location: Mission, BC, CANADA
Posts: 452
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Hangar 9 Pulse XT 40 -need a123 suggestions

I run 4s2p 4600 A123 packs in my Pulse. It flys good at this power. But I also fly 5s 6000mah pack with smaller prop and it is a rocket compared to the A123 packs. But I mostly run the A123 packs as they more enough power for me. I am using a Power 46 motor.
bobferguson is offline  
Reply With Quote
Old 05-01-2009, 08:57 AM
  #4
thrawn150
 
Join Date: Apr 2007
Location: Oak Lawn, IL
Posts: 142
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Hangar 9 Pulse XT 40 -need a123 suggestions

I can not speak for the A123, but with the 5S lipos and a power 46 its fast. I have had this plane for 2 years.
thrawn150 is offline  
Reply With Quote
Old 05-03-2009, 10:06 PM
  #5
wjbender
Thread Starter
 
Join Date: Jul 2007
Location: tinton falls, NJ
Posts: 65
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: Hangar 9 Pulse XT 40 -need a123 suggestions

I don't see any mention of cutting cooling openings in the undersife of the fuze to let cooling air out. What are you guys doing about cooling the esc and batterirs
wjbender is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -8. The time now is 06:48 PM.