Wattflyer RC Network: RC Universe :: RCU Magazine :: RCU Forums :: RCU Classifieds :: RCU User Reviews :: RCU YouTube
Home Who's Online Calendar Today's Posts RealTime Post Spy Mark Forums Read
Go Back   WattFlyer RC Electric Flight Forums - Discuss radio control eflight > Electric R/C Airplanes > Foamies
Register Members List Wattflyer Extras Articles Search Today's Posts Mark Forums Read Social Groups

Foamies Talk about building, power setups and anything having to do with e-powered foamy planes!

Thank you for your support (hide ads)
Reply
 
Thread Tools Display Modes
Old 08-18-2014, 12:38 AM   #1
jeff4912
Member
 
Join Date: Jun 2013
Posts: 25
Thanked 0 Times in 0 Posts
iTrader: (0)
Friends: (0)
Default FMS Extra 300 needs more power...ideas?

Anyone have recommendation for boosting power on this plane?
Has a proprietary type prop shaft on it.
Current specs:
Length
1285mm / 50.6in
Flying Weight
1880g
Power System
3948-Kv760 Brushless Motor
Speed Control
60A ESC, Internal 3A SBEC, T Connector
Propeller / EDF
13x5 3 Blade Scale Propeller
Servos
17gx4 metal gear
Landing Gear
Fixed
Required Battery
14.8V 2500-2600mAh 25C 4 cell LiPo
Required Radio
4 Channel
jeff4912 is offline  
  Reply With Quote
Old 08-18-2014, 02:55 AM   #2
kyleservicetech
Dennis V
 
kyleservicetech's Avatar
 
Join Date: Apr 2008
Location: Wisconsin, USA
Posts: 7,959
Thanked 688 Times in 670 Posts
Club: www.racinercclub.com (I'm the newsletter editor)
Awards Showcase

Outstanding Contributor Award  3kW  2kW  100mph Speed Demon 
iTrader: (1)
Friends: (20)
Default

Originally Posted by jeff4912 View Post
Anyone have recommendation for boosting power on this plane?
Has a proprietary type prop shaft on it.
Current specs:
Length
1285mm / 50.6in
Flying Weight
1880g
Power System
3948-Kv760 Brushless Motor
Speed Control
60A ESC, Internal 3A SBEC, T Connector
Propeller / EDF
13x5 3 Blade Scale Propeller
Servos
17gx4 metal gear
Landing Gear
Fixed
Required Battery
14.8V 2500-2600mAh 25C 4 cell LiPo
Required Radio
4 Channel
Have you checked the watts input to your motor with one of those wattmeters?

Your model is around 4 pounds, so good performance would be around 150 Watts per pound, or 600 Watts. Go above that, and look out!

I've got a Vyper model of about the same size and weight with aHyperion HP-Z3025-10 motor up front. This Z3025-10 motor might be a bit hard to find, mine came from Ebay. Running with a 5S A123 battery pack, this motor is running about 600 watts on a 13X6.5 prop that turns at 8300 RPM. The model flies straight up, and accelerates doing it.

http://www.wattflyer.com/forums/showthread.php?t=73065

Here is an 8 turn version of that motor. You'd have to play around with propeller sizes, and a wattmeter to set up optimum performance. FYI, this is a well made motor with real performance.
http://www.ebay.com/itm/Hyperion-ZS-...item2c8009b659

I don't know how strong your model is, but one thing to consider, really beefing up your power system could result in in flight structure failure of your model. From what I can tell, this is a foamie model, so putting far more power up front could be a real issue.

This motor is going to turn an 11-6 prop at some 12,000 RPM on a 4S LiPo battery, pulling around 60 Amps, and 700 Watts. Also, check out the various $$$$ Hacker A30 and A40 series motors. I've got two A40 motors that perform well on models weighing in at about 4.5 pounds.

What will help you on this model is one of those computer programs. I've been using www.motocalc.com, that works out well.

DennyV
Retired and the days are just too short, busier than ever!
kyleservicetech is offline  
  Reply With Quote
Old 08-18-2014, 05:46 AM   #3
JetPlaneFlyer
Super Contributor
 
JetPlaneFlyer's Avatar
 
Join Date: Mar 2009
Location: Aberdeen, Scotland
Posts: 4,369
Thanked 482 Times in 449 Posts
Awards Showcase

5kW  Outstanding Contributor Award  1kW 
iTrader: (0)
Friends: (8)
Default

In theory those specs should be giving plenty of power. I'd also suggest putting a wattmeter on it to see what's going on. It could be that it's just a case of the battery being tired and not holding voltage.
JetPlaneFlyer is online now  
  Reply With Quote
Old 08-19-2014, 01:04 AM   #4
CHELLIE
Super Contributor
 
CHELLIE's Avatar
 
Join Date: Oct 2006
Location: Hesperia, So. Calif
Posts: 18,318
View CHELLIE's Gallery13
Thanked 2,125 Times in 2,035 Posts
Club: Chino Renegades RC Flying Club
Awards Showcase

Scratchbuilders Award  Scratchbuilders Award  Ambassador Award  100mph Speed Demon 
iTrader: (4)
Friends: (306)
Default

use a 5 cell lipo 3000 mah and a 12 x 6 - 2 blade apc prop, check your Amp and Watts, keep the Amps to about 60 Amps, make sure your ESC can handle a 5 cell lipo

http://www.hobbyking.com/hobbyking/s...arch=wattmeter

I may be getting Older, But I Refuse to grow Up I am Having to much Fun to Grow Up LOL
CHELLIE is offline  
  Reply With Quote
Reply

  WattFlyer RC Electric Flight Forums - Discuss radio control eflight > Electric R/C Airplanes > Foamies

« Previous Thread | Next Thread »

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Everything You Wanted To Know About Electric Powered Flight AEAJR General Electric Discussions 269 06-27-2014 01:06 PM
Everything You Wanted To Know About Electric Powered Flight AEAJR Beginners 149 06-07-2014 03:57 AM
PKZ EXTRA 300 BNF Servos dereckbc General Electric Discussions 2 08-13-2013 07:58 AM
cox 20" Extra 300 EP RTF A_Smith ParkFlyers 12 02-26-2013 07:40 PM
HELP Battery system for airframe Extra 300 70" av8djc Power Systems 0 02-11-2011 02:29 PM


All times are GMT +1. The time now is 10:30 PM.


Powered by: vBulletin
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright 2005 WattfFlyer.com
RCU Eflight HQ

Charities we support Select: Yorkie Rescue  ::  Crohn's & Colitis Foundation



Page generated in 0.17351 seconds with 25 queries