HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old May 11, 2001, 09:20 PM
Isaiah 40:31
rc capo's Avatar
West Palm Beach, FL
Joined Jun 2000
689 Posts
Convert a 1958 Mechanix Illustrated plan to electric

I have been flying traditional RC for 10 years and have a Mini IFO for after work fun. This is my first try in converting a slimer free flight to electric.

I have Burnelli Blended Wing Body Free Flight Model airplane plans from a 1958 Mechanix Illustrated that I want to convert to electric.

The wingspan is 51"
Overall Length is 31"
Over all area (fuse+wing panels)
499 1/8 sq inches
The Fuse itself has an area of 246 sq inches

The plans call for a pair of "O.K.Cub .099" engines.

What size motors do I need, what size battery pack am I going to need, and what size servo's would be good?

Are retracts practicle on a 51" electric?

This should be an interesting "floater", has anyone else flown a BWB with any sucess?

Thanks
RC


rc capo is offline Find More Posts by rc capo
Reply With Quote
Sign up now
to remove ads between posts
Old May 11, 2001, 10:05 PM
Electric Coolhunter
Thomas B's Avatar
United States, TX, Fort Worth
Joined Jun 2000
14,510 Posts
No reason at all that model would not work with a couple of Speed 400s or Speed 480s and a 8 cell pack. (Motors in parallel) Just keep it light.
Thomas B is offline Find More Posts by Thomas B
RCG Plus Member
Latest blog entry: 2014 events and travel
Reply With Quote
Old May 13, 2001, 07:25 PM
Visitor from Reality
United States, VA, Arlington
Joined Dec 1996
12,788 Posts
RC
Bit of a SWAG, but two geared S400 6V motors, around 8 or 9" props, eight cells. The Graupner gearboxes are good quality and match up to their "Slim Props" well, while "Mini Olympus" are cheap and cheerful, need care in setting up but work fine at less cost. Wired in parallel, each motor would "see" all 8 cells, and current draw is 2 X what each motor draws on its own - that suggests a 30A rated ESC would be a good buy to give a little flex.

Servos - Hitec HS81 or thereabouts in size would do fine. Small RX, no need for a RX pack as the BEC on those small ESCs would do fine.

Sounds like you've been doing this long enough to build a decent, light and straight airframe. Watch out that the structure has wood where needed, it's an old design and there's no point in adding weight. The amount of "mounting" for a Speed 400 motor is almost laughably little compared to what's needed to hold down a small glow engine.

Covering - you'd want to go as light as you can. Litespan is great, or Fibrafilm. Monokote is not, at these sizes.

Retracts - possible, but only if you really must. At this, it would have to be the Robart mini units, or I understand Spring-Air do smaller units now. Be inclined to either go with fixed, or even more so, forget the gear and handlaunch at this scale. Anything but tarmac and smooth landings will give you grief, plus the weight increase is not good on this small a model.

Fascinating project, would love to hear how you get on.

Quick tip - go check out MARCEE - Minnesota electric only group's pages, has a lot of info on small multi electric motor models.
http://ijcooper.20m.com/Hobby/article.html

Another good spot - have a scoot around: http://members.aol.com/kmyersefo/index.htm#TOP and Keith Shaw's articles, all good stuff.

Regards

Dereck Woodward
Dereck is offline Find More Posts by Dereck
Reply With Quote
Old May 13, 2001, 08:55 PM
Isaiah 40:31
rc capo's Avatar
West Palm Beach, FL
Joined Jun 2000
689 Posts
Thanks for all the great information.

The following link is another Burnelli flying in the North East, I think Pennsylvania. But he showed off at Old Rhinebeck classic model day.
http://www.aircrash.org/burnelli/mod_rb2.htm

It's a slimer, but a beauty just the same.

rc
rc capo is offline Find More Posts by rc capo
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Convert u can do .60 to electric bach939 Sport Planes 1 Sep 12, 2004 02:21 AM
Convert u can do .60 to electric bach939 3D Flying 4 Sep 12, 2004 12:30 AM
Convert Sig Kadet MK 2 to electric pwr??? yldman 2 Sport Planes 5 Dec 14, 2003 03:22 PM
old FW190 plan - electric conversion stumax Scale Kit/Scratch Built 5 Mar 05, 2003 09:09 AM
Convert Ak-Models Su 26 to electric? BDub Sport Planes 2 Feb 26, 2003 08:14 PM