HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Aug 20, 2012, 12:04 AM
Registered User
Joined Aug 2012
18 Posts
Discussion
Conver a balsa stick 40 plus

I have a Balsa Stick 40 Plus that i was thinking about switching over to electric. I am interested in the ease of electric over glow. I know the stick 40 has been around forever and I hope its not sacrilege to convert it to electric. I am new to flying so if I get any replys type them slowly and in plain english cause I havent got all the lingo down yet. Thanks for your help.
FireChief4302 is offline Find More Posts by FireChief4302
Reply With Quote
Sign up now
to remove ads between posts
Old Aug 20, 2012, 01:31 AM
Registered User
wizard of odd's Avatar
Australia, WA, Kalgoorlie
Joined Apr 2011
1,435 Posts
Welcome to RCG!

The Stik is a perennial favourite amongst sport models and will fly well on electric power.

Some things need to be considered:
1. Weight of model ready to fly. Since you have the model already it would be easy to weigh it without the power system installed. The projected weight will determine what power plant will be required. If your model is for instance going to be around 5 pounds, and you want at least a power to weight ratio of 100W/lb, you will be in the market for a 500W+ power system.
Power (Watt)= current (Amp) x Voltage. The battery supplies the voltage to the motor via an ESC, and the motor will draw current depending on the load applied to the motor. The ESC needs to be able to handle the amount of current required (usually specified by the manufacturer), and so does the motor. A rule of thumb is 3W/gram for an average outrunner (though a decent quality motor will be able to perform well above this)- so for 500W power consumption, you will need a motor in the 160-180g weight class at least. Since W=AxV, your required power level can be reached by either lower cell count (voltage) at higher current draw, or higher cell count at lower current draw. Another frequently touted rule of thumb would be IC engine size in cubic inch x 1200, which in the case of a .40 size engine would be 0.40X1200=480W. Online propeller calculators like this one http://www.ecalc.ch/motorcalc_e.htm?ecalc can be handy to get you in the ball park, so to speak.

2. Wing loading. For a model like a Stik, you will probably aiming for a wing loading in the range of 15-18Oz/Sq.ft. If you can work out the wing area of the model, you can determine what a realistic AUW should be for the flight envelope you desire. Refer back to point 1. above. You can for instance have a power system weighing lets say 1lb, producing 500W at a power to weight ratio of 100W/lb, or a power system weighing 2lb, but with the increased weight still only producing 100W/lb (or maybe more), at the expense of a higher wing loading and poorer flying characteristics. You need to take this into consideration when choosing your power system- bigger motors and more cells are not necessarily desirable, unless you plan on flying a very high powered brick! It will still fly like a brick though....

Anyway, you must be tired after reading all that rubbish, so: Not knowing the details of your model, my guess would be a motor of between 200 and 250g, with a kV (r.p.m. per Volt) rating of 650-950, ESC of around 60A, spinning a 12x8-14x7" prop at an Amp draw of around 50A off a 4 or maybe 5 cell Lipo pack.

Hope that helps

Odd
wizard of odd is offline Find More Posts by wizard of odd
Reply With Quote
Old Aug 20, 2012, 02:31 AM
Registered User
Joined Aug 2012
18 Posts
Thanks Odd

Thanks for the info. I will reread it several more times in the hopes of understanding some of it. I guess I should have included that it has an OS .40 mounted on it now and has flown well with this engine. Plenty of power.
Thanks
FireChief4302 is offline Find More Posts by FireChief4302
Reply With Quote
Old Aug 24, 2012, 01:45 AM
Registered User
wizard of odd's Avatar
Australia, WA, Kalgoorlie
Joined Apr 2011
1,435 Posts
FWIW, I did a successful conversion back in the days, using an AXI 4120/18 motor, 60A ESC and 16 big heavy round jugs (Nicad cells) spinning a 14x7" prop. It was a bit of a porker due to the heavy batteries, but flew well. A similar spec motor and 5 Series Lipo should do much better due to the weight saving of Lipo vs. Nicad cells.

I believe there's an Eflite 46 motor of similar specs....

Odd
wizard of odd is offline Find More Posts by wizard of odd
Reply With Quote
Old Aug 24, 2012, 06:25 PM
Closed Account
Joined Sep 2005
589 Posts
conversion

Couple of years ago i built my third BUSA stick for electric power. Just deleted the pics of build which involved some lightening but that is not necessary, I have used a headsup r/c .40 and .46 outrunners on 4 & 5 cell lipolys. Servos are in the wing (2) and in front of the tail feathers. Programmed in flaperons as well. Pics jim

I reckon you can do better in appearance than i did !!
jim e is offline Find More Posts by jim e
RCG Plus Member
Last edited by jim e; Dec 08, 2014 at 06:15 PM.
Reply With Quote
Old Aug 24, 2012, 07:54 PM
Registered User
Henry Sistrunk's Avatar
United States, GA, Ochlocknee
Joined Jul 2006
75 Posts
I have a number of sticks but am not familiar with a stick plus. All of mine are converted to electric.
Henry Sistrunk is offline Find More Posts by Henry Sistrunk
Reply With Quote
Old Aug 25, 2012, 02:41 AM
Registered User
Joined Aug 2012
18 Posts
Thanks guys. This will help me get started.Looking forward to switching it over. Thanks for the pictures too.
FireChief4302 is offline Find More Posts by FireChief4302
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Balsa USA Stick 40 Plus--Gas or electric? Beemerider Beginner Training Area (Aircraft-Electric) 3 Apr 01, 2012 05:02 PM
Sold Balsa USA Stick 40 Plus plans kg4min Aircraft - Fuel - Airplanes (FS/W) 0 Feb 22, 2012 12:39 PM
Discussion stick 40 plus kit. (balsa usa) jmgm Glow to Electric Conversions 9 Sep 17, 2010 11:02 AM
For Sale Balsa USA Stick 40 Plus plans kg4min Aircraft - Fuel - Airplanes (FS/W) 0 Oct 21, 2008 07:37 PM
Sold Balsa USA Stick 40 Plus kit, new in box..PLUS a spare wing kit. Thomas B Aircraft - Fuel - Airplanes (FS/W) 4 May 04, 2007 07:31 PM