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Old Sep 23, 2010, 04:31 PM
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Nitroplanes F86 49" Wingspan Thrust Help

I received the following ARF today and weighed everything. With an 8S 4000battery pack and 45mmx77mm motor, it looks like it will weigh close to 7.7lbs (3400g) unless I made a spreadsheet error. The cover on the 6! page manual says 5.29lbs. I have to fly it off short(er) grass. I am using the 7 blade Haoye fan.This is my first ducted fan but I have done a lot of electric planes.

http://www.nitroplanes.com/81a805-f86df-kit.html

Questions:

How much thrust would I like to have to fly it off grass with a 7.7 lb plane ?

Is there any general conservative rule of thumb of watts into motor versus thrust out (based on chinese motor and fan efficiencies) ?

I had originally hoped to use 8S but in light of the weight, I was wondering if 6S might possibly be viable. Though the plane documentation talks of a 85A speed controller and 6S, I am concerned it won't produce enough thrust to get off grass. My best guess is a 5000 25C 6S battery (100a max speed controller) might produce 2000W. Any guess if thats enough to take off grass ?

The manual vaguely hints that metal geared servos should be used. Anyone confirm metal gears are highly recommended for DF (maybe due to vibration) ?

This plane came with a sheet of thin plastic to make an air exhaust tube but I don't believe there is an air tube in front of the fan which is mid mounted.
Is that normal or should I be trying to add a tube in the front ? There is no curved lip to the front edge of the fan, just a wood bulkhead
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Old Sep 23, 2010, 05:08 PM
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That's bigger than anything I've flown; I have a few jets that run on 4S, but are capable of taking off from grass.

Taking off into a 10+km wind is a BIG help, and small wheels are a drag.
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Old Sep 23, 2010, 05:49 PM
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for that plane..2000-2500 watts is sufficient normal flying...jet like performance u might need more ..this is at 7 pounds


i have the starfire at 7 pds.. 2200 watts and its fast,,..may be its sleeker than f-86
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Old Sep 23, 2010, 05:59 PM
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Quote:
Originally Posted by Mike_eee View Post
for that plane..2000-2500 watts is sufficient normal flying...jet like performance u might need more ..this is at 7 pounds


i have the starfire at 7 pds.. 2200 watts and its fast,,..may be its sleeker than f-86
Thanks Mike. How are you getting the 2200 watts: 6S or 8S ?
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Old Sep 23, 2010, 06:01 PM
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Originally Posted by Michael in Toronto View Post
That's bigger than anything I've flown; I have a few jets that run on 4S, but are capable of taking off from grass.

Taking off into a 10+km wind is a BIG help, and small wheels are a drag.
Wheels are 2.1" for main, 1.9" for front so they look somewhat promising.

Yes my field usually has lots of wind but unfortunately its a cross wind more often than not!
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Old Sep 23, 2010, 06:55 PM
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Fremont,CA
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Quote:
Originally Posted by DEdwards View Post
Thanks Mike. How are you getting the 2200 watts: 6S or 8S ?
on 6s with scorpion motor 1400kv and 101mm tiger fan
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Old Sep 23, 2010, 07:06 PM
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Originally Posted by Mike_eee View Post
on 6s with scorpion motor 1400kv and 101mm tiger fan
Also, what size battery and how long do you fly for ?
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Old Sep 23, 2010, 07:22 PM
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As far as thrust goes .50:1 flys scale like, .75:1 will perform very well, 1:1 awesome vertical. I have a jet at 7lbs with 4lbs of thrust and its off the ground in about 300ft or less (flying of DG not grass)
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Old Sep 24, 2010, 09:22 AM
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Probably one of the better spots to check the local EDF enthusiasts is the Aurora Model Flying Club's web-site as well as the EDF forum on RCCanada.ca -- there's three-four members of the AMAC who hand out on RCC and should provide some good information based on the3ir adventures with the various EDF models in the stables.

BTW, I do have to get my heinie in gear this winter and get my planes ready for next year and then get the time to fly and stay ahead of the crashes and repairs.
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Old Sep 24, 2010, 10:01 AM
EDF all the way!
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Gilbert, Az
Joined Jun 1999
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Build thread

Here is a build thread for the same F-86 ARF.
Bob
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Old Sep 24, 2010, 12:51 PM
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Ouch. How did I miss that!. Thanks.

Looks like I should be trying 8S but expect a hot plane on landing.
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