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Delta & Flying Wings Discuss electric powered delta (flying wing) style aircraft here.

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Old 05-28-2014, 10:19 PM   #1
Davethebluessinger
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Default Foamboard Delta - motor question

Hi Guys - it's been a while since I visited!

The UK weather has been miserable today so I decided to build something!
As I have some 350, 500 850 and 1000 MaH 3S batteries I decided a 24" delta might be a fun project so concocted one in my head as I went along, I decided on a tractor configuration.
I bought some paper covered foam board from a local craft shop and I had 9g servos 18A ESC and several motors lying around so it was virtually a freebie! However I have a question!
I decided that I would use an Eflite 300 outrunner and prop from a crashed Eflite P40 warhawk to power the plane. It's 1380KV and the prop is a 7 x 6 . When I checked the specs on the P40 it was 6.6oz flying weight but my design is coming in at 9.2oz (including battery etc) I'm wondering if this motor/prop will be powerful enough? Your thoughts please?


Dave

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Old 05-29-2014, 06:21 AM   #2
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My Mini4 is heavier than that and has a 1400kv on 3S and 7x5 prop ... she literally climbs into the clouds ...

http://www.wattflyer.com/forums/show...ighlight=mini4

Span : 720mm (28.25")
Constant chord : 165mm (6.5")
Wing area (not incl. Tail) : 11.88 sq. dm (1.28 sq.ft)
AUW incl. 1300 3S Lipo : 516gr (18.2 oz)
Wing loading : 43.43 gr/sq dm (14.22 oz/sq ft)

RCTimer 2826 motor 1400kv ... 7x5 prop ... 1300 3S LiPo ...

https://www.youtube.com/watch?v=O1JJ-D9Pan0

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Old 05-29-2014, 08:57 AM   #3
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Default Thanks!

Thanks Nigel, I just hope my "design" actually flies!!!

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Old 05-29-2014, 09:30 AM   #4
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The cleaner the design is - the more capable the motor / prop becomes ...

The P40 has a large front area and also the wing would have been full form. This has drag even though you get advantage of lift from the full form wing. Your foamboard delta likely has thin flat plate wing ? That means she will slice through air easier ...

Nigel

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Old 05-29-2014, 09:36 AM   #5
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Originally Posted by Davethebluessinger View Post
Hi Guys - it's been a while since I visited!

The UK weather has been miserable today so I decided to build something!
As I have some 350, 500 850 and 1000 MaH 3S batteries I decided a 24" delta might be a fun project so concocted one in my head as I went along, I decided on a tractor configuration.
I bought some paper covered foam board from a local craft shop and I had 9g servos 18A ESC and several motors lying around so it was virtually a freebie! However I have a question!
I decided that I would use an Eflite 300 outrunner and prop from a crashed Eflite P40 warhawk to power the plane. It's 1380KV and the prop is a 7 x 6 . When I checked the specs on the P40 it was 6.6oz flying weight but my design is coming in at 9.2oz (including battery etc) I'm wondering if this motor/prop will be powerful enough? Your thoughts please?


Dave
your power system with a 1000mah lipo should be perfect, deltas like a little extra weight, it helps to stabilize them, Take care and have fun.

I may be getting Older, But I Refuse to grow Up I am Having to much Fun to Grow Up LOL
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Old 05-29-2014, 10:58 AM   #6
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My Scratch Built Delta Foam Board with the Paper removed and CF bracing, one of my 1st Humble Foam Board E Power Builds




http://www.wattflyer.com/forums/show...ck+delta+build


I may be getting Older, But I Refuse to grow Up I am Having to much Fun to Grow Up LOL
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Old 05-29-2014, 03:43 PM   #7
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Chellie
Is that the $tree foam with the paper removed?
I watched the video, looks like a good design.
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Old 05-29-2014, 09:20 PM   #8
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Originally Posted by soarrich View Post
Chellie
Is that the $tree foam with the paper removed?
I watched the video, looks like a good design.
Hi, Yes it is, but you need to brace the foam if you remove the paper, or just take the paper off of one side of the foam, it Flew great , it was fast too with a 2408-21 bell motor and a 6x6 prop on 3 cells, about 60 to 70 Mph, my camera person had a very hard time trying to keep it in the view finder I gave that delta Plane to a kid in our flying club, and he flew the heck out of it seeing him fly it was a heck of a treat for me, as he was having as much fun as I did with it

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Old 06-02-2014, 08:57 PM   #9
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Default Been So Long....

Been so long since I did it I'm damned if I can remember how to post photos!!!
Anyone enlighten me please?

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Old 06-02-2014, 09:05 PM   #10
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Originally Posted by Davethebluessinger View Post
Been so long since I did it I'm damned if I can remember how to post photos!!!
Anyone enlighten me please?
Two ways ............. use the "Manage attachments" button below the box you type posts in ... just scroll down ...
They tend to need small photos though and the attached is small to view. If you want to show real detail - then the second option is better :

Open a Photobucket or similar 3rd party photo online archive account. each photo you upload will give you options for using ... what you need is the [img] code.... copy and paste that into the post and you have an embedded photo. Don't bother with the yellow button above in the menu bar .. it's easier to just cut and paste the total code from photobucket.

Sometimes you may need to manually correct an entry ... then it's [img] ... [/img] enclosing the url link.

Nigel

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Old 06-02-2014, 09:16 PM   #11
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Thanks Solentlife!

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Old 06-02-2014, 09:23 PM   #12
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I've removed the undercarriage now and fitted a prop saver but you get the idea....


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