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Old Dec 10, 2004, 04:13 PM
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thermal's Avatar
Maryland's eastern most shoreline
Joined May 2004
566 Posts
Sig Riser 2m conversion to electric

I have a Sig Riser 2m that I bought about 10 years ago and I would like to build it as an electric glider. Has anyone done this conversion? I'm wondering what motor/prop/battery to try. I was thinking one of the smaller AXI brushless with a couple of Lipo's might work but I'm unsure as to which one.

Does this seem like a worthwhile project or is the Riser unsuited to the task?

Thanks for any suggestions and insight.
Bob
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Old Dec 10, 2004, 05:24 PM
WAA-08 THANK FRANK!
JimNM's Avatar
Las Cruces, New Mexico, United States
Joined Jun 2002
7,311 Posts
Build it - do it - don't be scared...What do you have to lose? I have done a conversion on a 99" glider - and it all worked well. The biggest problem I had was getting started... it always is for me. I'll spend months debating, designing, thinking and putting it off - until the day I get off my butt - and get the whole thing done in about an hour.

Thermal - do you have flying exp? Do you have electric exp? If not - read the FAQ at the bottom of this (and every other page) on the ezone. For 2m birds- I reccomend a 500/550/600 (all the same size) motor and a gearbox with 8 cells. A frugal yet worthy setup will run you about:

$30.00 motor (Kyosho ENDOPLASMA or ATOMIC FORCE) towerhobbies.com
$30.00 Inline Gearbox 3.33 or 3.8 to 1 (MPJet are good brand) aircraft_wold.com
$25.00 prop/hub aircraft-world.com
$45.00 8 cell FAUP battery.
The magic number is about 40 watts to a pound of plane (for gliders). Below 35 and you will struggle to gain altitude- the further you go above 40 - the more fun I have. I run about 60 to 70 watts per lb. on my planes.

Good luck
JimNM


There is a whole lot more to making a conversion - but until we know more about you and your plane, I can't be much more help.
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Old Dec 10, 2004, 06:04 PM
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thermal's Avatar
Maryland's eastern most shoreline
Joined May 2004
566 Posts
Jim,
Thanks for the reply. In answer to your questions;

I have been flying for 6 months, glow planes...a trainer (Alpha 40), a Hanger 9 Twist 40 and a 40 size pattern plane. I can fly all of these fairly well so I'd put myself as an apprentice intermediate flyer. I have flown a Slow Stick electric but that is all in the electric arena.

I really want to get into sailplanes but no one at the field I fly at is flying them so I'm pretty much on my own as to learning. I figured the electric route would be easier for me to begin with than trying to use a high start.

I'm like you in that I tend to take a long time to get started at something and then when I finally do it...I say "why didn't I do this earlier!"

Thanks for your help,
Bob
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Old Aug 20, 2014, 09:30 PM
I just want to go fly!
walter3rd's Avatar
United States, MD, Towson
Joined Aug 2012
2,477 Posts
motor options?

just finished my wing and getting excited about my first kit build and first sailplane. going to put a brush-less motor in the nose. recommendations on size of motor and folding prop specs? thanks a lot. walt
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Old Aug 28, 2014, 12:32 PM
Registered User
Australia, WA, Cowaramup
Joined Oct 2011
26 Posts
Hi Walt

Try this combination:
motor park 450-890kv http://www.hobbyking.com/hobbyking/s...dProduct=23880

speed control http://www.hobbyking.com/hobbyking/s...dProduct=26497

Prop 11x8 or a 11x7 carbon fibre

This is what I use in my skybench 2M lil bird and some other 2m RES planes and I'm very happy.

TW
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Last edited by teamwilly; Aug 28, 2014 at 12:33 PM. Reason: link
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Old Aug 28, 2014, 12:47 PM
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Joined Jan 2007
597 Posts
why not just use a power pod so you do not have to cut off the nose, that s what i am going to do with mine lol..
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Old Aug 29, 2014, 10:41 AM
I just want to go fly!
walter3rd's Avatar
United States, MD, Towson
Joined Aug 2012
2,477 Posts
here is my electric sig riser

this has a park 480 bolted in place of the balsa nose cone. 36 amp esc and a2200 3s batt at the moment. still waiting on my folding prop and spinner but balances great so far. hoping for a test flight maiden this weekend. this is my first build and first sailplane as well. excited to say the least.
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Old Aug 30, 2014, 04:53 AM
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United States, CT, East Hartford
Joined Aug 2010
152 Posts
2m Riser

Quote:
Originally Posted by walter3rd View Post
this has a park 480 bolted in place of the balsa nose cone. 36 amp esc and a2200 3s batt at the moment. still waiting on my folding prop and spinner but balances great so far. hoping for a test flight maiden this weekend. this is my first build and first sailplane as well. excited to say the least.
Hi Walter 3rd,

I had a 2m Riser with a 480 910 kv HK motor. I used a 1300 mah battery and a 40 amp ESC with a 9 x 5 folder I got from another plane. What a pussycat to fly! I only needed 1/2 throttle to fly it but I needed the weight to get the 25% CG. A steady flier, it was resistant to the wind when you bank gently and would be the go-to windy day glider. I used cellophane gift wrap-as per You Tube- for covering and saved a TON of weight by coating the plane with Stix-It first before applying the cellophane. I flew it RET and the red covering was really pretty in the sun. Happy Days!

Take Care,

Ron
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Last edited by doublebuck; Aug 30, 2014 at 04:56 AM. Reason: forgot to show prop. size
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