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Old Sep 27, 2001, 12:51 AM
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North Hills
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1/12 Stormovik Conversion - Astro, Jeti, Endo?

I've decided to convert a Warbirds LTD IL-10 Stormovik to e-power. It is a 1/12 scale combat aircraft with a f-glass/kevlar fuselage and a balsa sheeted Clark Y wing, designed for a 2-cycle .20-.26 engine. Wingspan is 46" and AUW in glow trim is 46oz.

I would like it to be a strong performer, with plenty of speed and good vertical. Basically, something that can keep up with all the overpowered sport ships at the local field.

I have three thoughts on a power set-up, but my e-experience until now has been limited to 400/450 powered aircraft, so I may be totally off base.

Option 1 - Astro 05
This is the motor recommended by the manufacturer for e-conversion. According to A/F's website, the 05 is good for 200W, which puts me at the low end of the power scale. Plus, for the cost of an 05 and esc., I might as well go brushless.

Option 2 - Jeti Brushless
The price is right, but I really haven't seen a lot of performance data on the Jetis. H.L. says the 15/4 is good for sport aircraft up to 56oz.- my guess is that the Stormovik will be in the mid-50oz. range, and that performance may be marginal. The 30/3 is marketed for aircraft up to 88oz., which seems like overkill.

Option 3 - Endoplasma, geared
Now that Gary Wright has proven the worth of the geared Endo with the E3D, it seems like a very viable solution. My main concern is prop size - a 12" prop seems like way too much for this plane. The Storm. won't have gear, and a 12"er sounds like prop 'n gearbox bustin' fun. Something in the 9" range sounds more appropriate. I really have no idea what type of ratio / pinion I would need to get 35ish amps.

Any thoughts on the above power systems or personal experience with similar conversions would be appreciated. Although money is not a real concern, I'd like to keep the costs reasonable so I can afford to do some other projects - I've got my name on the long list for an E3D, and would like to do something like a 4 Star 40 conversion this winter.

Thanks all, Pete
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Old Sep 27, 2001, 02:16 AM
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Antioch,CA,USA
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Pete, the more I look at the posts on it, the more I like hearing about the Endo choice. You could use a 12" or 13" prop if it was a folder. GWright has been experimenting with this combo as well. Pete from Model Electronic Corp. has been using the 13 X 7 Sonictronics folder for awhile now. He's had exceptional performance with it. I saw him fly his styro P-51 with it at KRC and it did a ~400 foot rolling vertical climbout right off of hand launch.
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Old Sep 27, 2001, 11:48 AM
ARFs make me BARF
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United States, MI, Roseville
Joined Dec 2000
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I fly my scratch built 51 and jug ( both 42" span, about 260 sq,and 45 ozs ), with a MM reverse 3.5:1 MAS box and a ( not too large ) 12-10 APC.I run 10 1250 scr cells.Performance is GREAT.
Mark Ralston has his scratch built Corsair done and flying using the Endo 12-8 and 4.6 box on I think 8 cells, and performance is also great...Either way, keep it light!
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Old Sep 27, 2001, 10:52 PM
BEC
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Auburn, Washington USA
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How many cells do you want to use?

The Jeti 15-4 will swing a 9 inch prop with gusto on 7 cells direct drive. More cells indicate the 30-3 (which, by the way, is about the same weight as a S600 and just a bit more than the Endo) or a 10-11 inch prop on 7-8 cells.

OTOH I think to get the performance you're talking about you'll want to go geared and swing that 12 inch prop. What would be a scale diameter for the Stormovik? A folder would make the belly landings a bit less dicey.
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Old Sep 27, 2001, 11:24 PM
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Tyler, Texas, United States
Joined May 2001
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My Jeti 15/4 on 8 cells gives the kind of power you are talking about to a 40 oz (AUW) Electrostreak. I don't think it will work as well with a 50+ oz plane. I would go for the 30/3. It is an ounce or two heavier, but not really any more expensive, and I think you will appreciate the extra power.

Leonard
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Old Sep 28, 2001, 01:07 AM
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North Hills
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Thanks for your thoughts guys.

I'm leaning toward the geared endo set-up with a 12"ish folder. I have 8 and 10 cell packs available, so maybe I'll just play around with props, ratios and cell counts to see what works best. I'll save the B/L motor money for another project.

I don't really know what size prop would be scale, but I mocked up the airframe, put a ruler across the nose and it looked BIG. Maybe I'm just too used to looking a 5x5's...

Mark, That's one beautiful jug, and I'm really liking the big P-51. Are plans available?

Thanks again, Pete
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Old Sep 28, 2001, 06:47 AM
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Woodbridge, VA
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One nice advantage with the endo system is that you pull the same amps (give or take an amp) with either 8 cells and a 3.8 GB or with 10 cells and a 4.6 ratio. On my Corsair I'm using 10 cells with the 4.6 ratio and a 12x8 prop. If you want more speed another prop choice is the 11x10. Both pull ~40 amps.
I don't know what your wing area is, but my Corsair is 390 sq in with a 51" wing span. The weight is 58.5oz and even Dereck agrees that the Endo hauls my Corsair around with plenty of authority.
Mark
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Old Sep 28, 2001, 08:04 AM
ARFs make me BARF
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United States, MI, Roseville
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Plans are available only for the '51, the jug was a one off, built w/o plans!
$22.00 for 51 plans, they show a,b,c,d,and reno versions.
Mark
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