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Sep 30, 2012, 02:24 AM
Where's the lift?
dgliderguy's Avatar
Mini-HowTo

Electric spoilers from Hobby King-- mounting to BOT wing


I just got my new pair of 250mm electric spoilers from Hobby King today, and I decided to mount them to my e-BOT this evening. No sweat! They dropped in faster than a pair of servos! And at only $24.99 for the pair, it was a real bargain that couldn't be passed up.

An easy evening's worth of work was all that was required to do the job, and now I have a way of coming down safely in big air, and I can drop the Bird of Time down onto a small patch at the schoolyard without risk of overshooting into the fence. I like it!

I've had my BOT ARF for going on nine years now, and it has been a fabulous thermal ship. About five years ago I converted it to electric power (AXI 2820/10 on 3s lipos), and just recently it went through a new facelift with an all-new covering job and new paint on the fuselage. It has been an excellent ship for parks and open fields, but with no spoilers or flaps, it required something the size of a large baseball diamond to get it down without risk of hitting anything. That problem has been solved now. I will be trying it out tomorrow at the flying field, and will report back here on how well the new spoilers performed.

Anybody else tried these yet?
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Sep 30, 2012, 12:06 PM
It's gonna be YUGE!!!
LVsoaring's Avatar
Nice clean installation! Looking forward to the flight/landing report.
Sep 30, 2012, 12:53 PM
R2R
R2R
Registered User
R2R's Avatar
Same here Thanks for posting!
Sep 30, 2012, 02:49 PM
Sticker Field Flyer
Plantation Bruce's Avatar
Never used them but they look cool.
Last edited by Plantation Bruce; Oct 01, 2012 at 12:51 AM.
Sep 30, 2012, 11:24 PM
Where's the lift?
dgliderguy's Avatar

HK spoilers get a thumbs up from this thermal junkie


Well, I tried out my new spoilers today, and they work great!

I had to mix some up elevator (around 20%), as the spoilers do cause a pronounced pitch down (negative pitch moment) when deployed, but with the elevator mix set to the correct value, deploying the spoilers leads to a pleasant and completely controllable nose-level descent all the way down to the spot.

No complaints from this consumer-- highly recommended!
Oct 05, 2012, 12:29 PM
Registered User
Hi,
I would like to get a set of electric spoilers for my glider, but the Hobby King does not seem to be working. Is there another place to order them?
Oct 05, 2012, 12:40 PM
LSF303-AMA Fellow
tkallev's Avatar
Maxx Products also sells self-contained spoilers but they cost more than Hobby King ... but the quality is probably better than HK as well.

http://www.maxxprod.com/mpi/mpi-15.html

Mar 20, 2017, 07:38 AM
Registered User
hi all

i have a pair of these also to install in a new set of wings I'm making for my Graupner Cirrus.
Because Hobby King stuff is not super robust, I wanted to make them removable (for
if they break). So I was contemplating drilling tiny holes in the flanges (which are 2.5mm wide) so I could screw them onto the balsa rails (if I can get say hard say 4mm balsa).

Any thoughts on that ?

cheers
Neil
Mar 20, 2017, 08:55 AM
Registered User
Quote:
Originally Posted by neilk
hi all

i have a pair of these also to install in a new set of wings I'm making for my Graupner Cirrus.
Because Hobby King stuff is not super robust, I wanted to make them removable (for
if they break). So I was contemplating drilling tiny holes in the flanges (which are 2.5mm wide) so I could screw them onto the balsa rails (if I can get say hard say 4mm balsa).

Any thoughts on that ?

cheers
Neil
Try a piece of pine. A piece that small is not a lot of weight but will give you good grab by the screws.
Mar 20, 2017, 10:14 AM
Where's the lift?
dgliderguy's Avatar
Agreed. I never trust screws in balsa-- the threads are just too soft.

I can't see why your idea of removable spoilers wouldn't be a fine idea, Neil. The only issue is that you will still need to bury them at least 1/16" deep in the wing if you are going to use balsa sheeting to make them flush with the wing contour.

I plan on cutting my spoilers free if it ever comes to that, and then re-installing new ones in the same sequence as the original installation. So far, the cheap HK spoilers have been holding up just fine, after over four years of regular service.
Mar 21, 2017, 08:17 AM
Registered User
i kind of dread the thought of trying to cut the spoiler box/rail out without destroying
the surrounding ribs and webbing. I also wondered if there is some glue that is good enough to hang on but with some coercion would let go (generally the opposite of what we want!)

But useful to know yours have worked well for 4 years

Agreed balsa not so good for screws. I am also contemplating making glue plugs to screw into.
Perhaps pine is light enough...

cheers
Neil


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