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Author Topic: Doubloone E36  (Read 241 times)
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Sandgroper
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« on: December 06, 2017, 03:24:36 AM »

No prizes for guessing the heritage of this one. Due to the extra weight of the King Kong 2205 2300kv motor with its 20amp ESC and bigger battery I thought a bit more wing area would help bring the loading down and with the E36's span limited the only way is to increase the chord. I chose the Doubloon 1/2A power model wing because it has lots of area and the section is very thin. The Doubloon is 38" span with a 7" root chord, straight ribs and tip dihedral so I shortened the inner panels an inch and added the polyhedral and diagonals to suit my tastes. The battery ended up under the CG, it weighs 210g all up and the wing area is 232 sq inches. The only Doubloons I have seen built both had Mills 75's up front for use in scramble and they were real floaters.

Phil
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Scottl0413
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« Reply #1 on: December 06, 2017, 09:24:43 AM »

Phil, you're on the right track with the larger wing area. I've been experimenting with a Galaxie wing re-sized to meet the 36" dimension for E36. Wing cord is 6.5". I'm using a drone racing motor that is rated at 2950 kv. So far results have gained a first place at the last contest of the year in Muncie. total flying weight came in at 220 grams. Battery is an 350 mah 65C Nan0-tech, Esc is 12 amp proton, timer is flightech, prop is an APCE 6 x 5.5. I'll try and get a pic of it for you.

Scott
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Sandgroper
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« Reply #2 on: December 06, 2017, 09:41:14 AM »

Thanks Scott, good to know I am on the right track and 210g sounds a lot better now. The APC 6x 5.5 seems to work well on the high Kv motors, Paul Rossiter has built a E36 Maverick and has been playing around with different motors and props and recording the results with an altimeter. The first graph is the Cobra 2203-2800kv with a APC 6x5.5 and the second with a 6x5.

Phil
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« Last Edit: December 06, 2017, 09:57:33 AM by Sandgroper » Logged
Sandgroper
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« Reply #3 on: December 06, 2017, 10:26:14 AM »

The King Kong is a drone motor but only 2350kv, it has a 5mm hollow stainless shaft, curved magnets and the rear circlip is well recessed, not sure how it stacks up in the air but it sure sounds impressive for $9.70.
https://www.banggood.com/Kingkong-2205-GT2205-2350KV-2-4S-Brushless-Motor-With-Motor-Protector-For-X210-220-250-280-Frame-Kit-p-1106900.html?rmmds=search&cur_warehouse=CN
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