1st glider build - Sig Riser 100 electric conversion - RC Groups
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Sep 06, 2008, 11:52 AM
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1st glider build - Sig Riser 100 electric conversion

Have been flying fuel and electric planes for about a year, 3-4 builds. Would like to try an electric glider - chose Sig Riser 100 - LHS had one. Plan on the following gear:

BP Hobbies 2826-6 Motor 730 kv - similar to eflite power 25
CC Phoenix 45
Flight Power 3s 2500 20C
Aeronaut 14x7 folding prop
Futaba 3004's for rudder and elevator
HS 55 for spoilers - one each wing

Planned mods:

New ply firewall on shortened nose for motor mount 3 deg downthrust
2-56 rods for control linkage rudder and elevator
Re-enforce fuse around wing TE
Sig AeroKote Lite covering - have extra

Any thoughts, suggestions, comments would be welcome.
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Sep 06, 2008, 12:34 PM
Good, fast or cheap, pick two
robh's Avatar
Hi Mikey... go for it, sounds like it could be fun! Please keep us posted as the build progresses - pics are always good too.


Sep 06, 2008, 01:19 PM
Registered User
Beginning fuse - cut off and angled nose for new firewall
Sep 06, 2008, 01:24 PM
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Seahag721's Avatar
Hey Mikey keep us posted on the details of your build. I've been debating on one of two planes the dynaflite butterfly or the sig 100. I'm leaning toward the Sig 100. At any rate here is https://www.rcgroups.com/forums/showthread.php?t=319505 another thread of a sig 100 conversion if you haven't seen it already. :-)
Sep 06, 2008, 01:30 PM
The Lone Blue Plaid Flyer
Bob Cook's Avatar
Hay Mike,

I just finished doing this mod a few weeks ago. I added 2 ea 6 inch wing tips to it. I call it the Riser 112. Everything your doing looks good, as far as the planned equipment goes. Here is a shot of my plane. There is a build thread on it here too. Your gonna love it. It flies great.

Bob in Seattle
Sep 06, 2008, 04:03 PM
Blueplaidcanard flyer
Mine uses an E flight 15 motor,with a 12x7 apc. With the motor you have expect 85+ deg climbs.You might want to put 3 deg right and about 5 deg down on that for the thrust lines.The power system you have sounds awsome,but do make sure the wing is flat as per plan so no surprises come at you.On the fuse put a doubler of 1/8 light ply from the cut outs left from the kit on the inside of the fuse behind the former at the back of the wing,even if you use the bolt on wing the aft dowel holes are a weak point.While you are stiffening things up,add some corner gussets to the stab,don't worry the motor and battery will offset the weight.To cool the works use a plastic spoon scoop on the battery hatch and remove the covering from the last lightening hole in the fuse bottom.scottie
Sep 06, 2008, 04:44 PM
Registered User
Thanks for the advice.

Some more done - fuse glued, used 1/8 sq and thin ca to re-enforce side to bottom joints - not much weight but more strength and stiffening.

New firewall epoxied in.
Sep 07, 2008, 08:17 AM
Blueplaidcanard flyer
Try what I did,use the left over fuse side and bottom pieces and make a cowl for the motor.I used 1/4sq balsa in the corners so I could round it to a 1 3/4" spinner,the cowl on mine is held on with a 1" wide strip of the fuse covering so I can peel it off if needed.
Sep 07, 2008, 10:10 AM
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Seahag721's Avatar
Hey Mikey, I noticed your motor mount seems flush with the firewall, are you using spacers to get your right & down thrust angles or did you cut the fuse to the proper angles. Any advice on which way is better? Your pics are great, so please keep'em coming
Sep 07, 2008, 11:21 AM
Registered User
Installed the firewall with 4 deg downthrust, no right but will use washers if necessary.
Sep 11, 2008, 10:40 PM
Registered User
Some more work:

made hatch for battery compartment and hatch/cowl combo for esc compartment. Rough shaping until spinner and prop arrive tomorrow.
Sep 11, 2008, 10:48 PM
The Lone Blue Plaid Flyer
Bob Cook's Avatar
Looks very nice. Keep on gluing !!!

Bob in Seattle
Sep 12, 2008, 05:43 AM
Blueplaidcanard flyer
Nice work on the hatch/cowl,should look real fine when it's shaved down to the spinner contour.
Sep 13, 2008, 01:12 PM
Registered User
I gather your motor choice doesn't have a reversible prop shaft to allow direct bolting to the inside of a firewall?

Sep 13, 2008, 06:29 PM
The Lone Blue Plaid Flyer
Bob Cook's Avatar
Hi R/E,

I thought that too, but maybe he did that for CG ???

Bob in Seattle

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