Thread Tools
Jul 19, 2007, 08:11 AM
Two left thumbs
Discussion

Randy Randolph Jodel for E-power


I probably should have put this thread here, but didn't, so now I'll do it!
https://www.rcgroups.com/forums/showthread.php?t=704228
Sign up now
to remove ads between posts
Aug 08, 2007, 10:30 PM
Two left thumbs
This is almost a new design. "D" tube wing leading edge (original was open frame) ailerons added, built up fuselage, and a GWS type stick engine mount.
Purists will note the nonscale wingtips. Full scale Jodel's wings taper on the underside of the dihedral portion.

Regarding photo #3, the Novarossi .50 is NOT for this application!
Last edited by GeoffinIN; Aug 08, 2007 at 11:02 PM.
Aug 19, 2007, 10:49 PM
Two left thumbs

Electrics installation


All the electrical stuff is installed, including a switch mode BEC since I'm running four servos.
Aug 19, 2007, 11:57 PM
Registered User
Are the plans available for the Randy Randolph Jodel and if so where do you get them?
Aug 20, 2007, 01:50 AM
Registered User
thomanie's Avatar
Quote:
Originally Posted by Zingo
Are the plans available for the Randy Randolph Jodel and if so where do you get them?
They are listed at Model Airplane News' online store - rcstore.com. Search for "Jodel" and you'll find it

Thomas
Aug 20, 2007, 08:33 AM
Two left thumbs
MAN plan # FSP 04971. The only things remaining of Randolph's plans with this build are the basic outline and the rib shape. I'm redoing it to make it light enough for e-power.

Randolph used heavy wing spars with no webbing, and plywood dihedral braces; I've done a light D tube instead, with spar carry-throughs for the dihedral break. The fuselage is a slab side over framework on the Randolph design; mine's entirely built up framework.

If you build one too, post shots of your solutions to making it lighter/stronger, please. My way is not the only way!
Last edited by GeoffinIN; Aug 20, 2007 at 08:42 AM.
Aug 20, 2007, 10:47 AM
Registered User
Thanks for the info. I just ordered the plan. They have free shipping till the end nof the month.
Aug 23, 2007, 08:58 PM
Two left thumbs

Jodel wearing red


I didn't realize this Nelson Lite covering was transparent. Oh, welllll... Now, on to the trim. As it is, it weighs just under 16 ounces, so I baarely made my target weight.
Aug 23, 2007, 09:02 PM
Registered User
P. Tritle's Avatar
Geoff, Nice job on the Jodel! Will be anxiously waiting on the flying reports. She should fly great!

BTW, don't sweat the transulcent look of the cover. In the air it will really glow!

PAT
Aug 23, 2007, 09:39 PM
Two left thumbs
Welllll, Pat, it I can ever build one half as pretty as your builds I'll be delighted!
Aug 23, 2007, 10:05 PM
Registered User
P. Tritle's Avatar
Geoff, The Jodel looks pretty durn good to me! As long as you're having fun, you're on the right track.

PAT
Sep 01, 2007, 05:37 PM
Two left thumbs

First Fright - errr, flight


I forgot my camera, which is fortunate, since it'll save some embarrassment.

The field was busy (four others in the air) so I was nervous. The Jodel rolled about three inches before the tail was in the air, at which point the right wheel decided it did NOT want to go flying, and ran off on its own. (Note to self: Cut off ends of small zip ties, while light, make lousy wheel collars.) A fellow flier offered a pair of collars. They were for 3/16" wire, not my little 1/16". I put them on and hoped the set screws, which were almost clear through the collars, would hold.

By now I thought it best to let a better pilot than I do the maiden hop. I handed my transmitter to one of the club instructors, and he took off with it. Once again, that same right wheel did NOT want to go flying and jumped off just as soon as it felt a lack of terra firma and skedaddled down the runway. But, the major part of the plane was airborne.

Dan, my volunteer test pilot, said the trim was awful. Once he added full down elevator trim and half the aileron trim it flew straight. Then it settled down and, at about 1/3 throttle, put-putted around the pattern in very scale-like fashion. Dan looped it. Well, it was more of a cartwheel - I think the tail just pivoted around the center of gravity with zero forward progress. He tried a stall. No problems. I knew I included all that tip washout for a reason!

Even with a relatively high (11.3 oz/sq. ft) wing loading it floats. That's a good thing when one wheel is AWOL! The landing was amazingly uneventful.

Soooooo, other than adding some proper wheel collars, increasing the horizontal stabilizer incidence, and re-rigging the ailerons, it works. Now on to installing the cowl and trim.
Last edited by GeoffinIN; Sep 15, 2007 at 11:18 AM.
Sep 05, 2007, 09:12 PM
Two left thumbs

It flies


After resetting the horizontal stabilizer incidence, installing the cowl, warping the wings to make the ailerons run true, and adding 2 degrees downthrust, the little bird is a good flier.

Total weight is exactly 16 ounces, with 261 sq in wing area. Very scale-like flight with a GWS 8-4.

The lightening/strengthening modifications seem to be entirely successful. If you want a simple scale conversion from slab-sided 1/2A slimer to built up stick electric, you could do worse than Randy Randolph's Jodel!
Sep 05, 2007, 11:46 PM
Registered User
Sluf7's Avatar
Cool gotta love a Jodel.........
Sep 06, 2007, 06:14 AM
Registered User
thomanie's Avatar
She's real cute Geoffinpdx

Makes me want to start the Randolph Chips for E power...

Thomas


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Changes to Randy Randolph Jodel for E-power GeoffinIN Glow to Electric Conversions 3 Jul 18, 2007 11:02 PM
Gus Morfis P-51B for E-power PeterH Scale Kit/Scratch Built 13 Sep 09, 2002 02:54 PM
WTT: Glow for e-power Whizwaz Aircraft - Electric - Airplanes (FS/W) 1 Apr 16, 2002 06:40 PM
Baker Marathon for e-power Sparky Paul Power Systems 1 Nov 13, 2001 02:31 PM
Good Source for E-Power Old Timers StructuresGuy Electric Plane Talk 4 Sep 10, 2001 10:25 AM