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-   -   F16 Conversion EDF to Prop (https://www.wattflyer.com/forums/showthread.php?t=80126)

solentlife 06-22-2019 10:57 AM

F16 Conversion EDF to Prop
 
OK guys ... I have a Lanxian 70mm EDF F16 that I really am not fond of. The 70mm EDF flies it - but needs so much power - it is just overweight ... I ended up using 5S in her.

Bare weight all in but without LiPo is 1050gr
LOA = 1020mm
Span = 780mm

My thoughts are to remove the EDF unit and fit a prop up front. If I hollow out the nose area - I can slide a brushless in there and then spinner can give nose cone back.. Battery size can be reduced to possibly 4S ...

Question is what motor and what prop ? I was thinking something around the 35 - 38 size with 8 to 10" prop ?

Ideas please ?

https://i6.photobucket.com/albums/y2...-decalstop.jpg

solentlife 06-22-2019 11:04 AM

eCalc :

With a 3542 / 1000kv and 9x6 prop ... it says I should have at least 1.49 : 1 Power to weight and max speed of 102kph.

mmmmmm interesting.

Jools 06-23-2019 12:29 AM

I think the REAL problem is lack of wing area. The wing loading must be enormous. It'll have a speed range of very fast and *loody fast!

The other problem may be that big all-moving elevator in the propwash. We've found converting slope-soarers to electric, that fixed stabs with hinged elevators are FAR superior to AME.

solentlife 06-23-2019 09:16 AM

The all moving tail - that got broken a while back and is now fixed + rear moving elevator as conventional plane.

Its surprising actually that she flies slower than you expect ... the fuselage is somewhat a lifting body to complement the wing area.

But not when I first tried the new elevators !! Had to keep speed up to give authority to keep nose up !! Pity about the landing .. buts she's RTG again ..


solentlife 11-04-2019 12:25 PM

Just looking in eCalc ...

I gave 1.5kg
3S 3000
70A ESC
Turnigy 3530 1400kv
APC 9x5
=
8mins flight,
360W,
Thrust to weight 1.1 to 1,

So it looks like I can shave quite a bit of weight of by not having that hulking great 5S in there ...

Looking in my spares box - I only have a 3530 1100kv so :

I then entered 1.2kg
3S 3000
50A ESC
TGY 3530 1100kv
APC 10x6
=
11mins
257W
1.09 to 1

If I up to a 4S and drop prop back ...

1.2kg
4S 3000
50A ESC
3530 1100kv
APC 8x6
=
13mins
309W
1.2 to 1

VERY INTERESTING !!

The question then remains about launching ... looks like maybe need to look at retracts being fitted t avoid the hand launch scenario - its a big model and no way for own to do it - must be second person. Or a 'dolly'

CHELLIE 11-05-2019 10:47 AM


Originally Posted by solentlife (Post 1021400)
Just looking in eCalc ...

I gave 1.5kg
3S 3000
70A ESC
Turnigy 3530 1400kv
APC 9x5
=
8mins flight,
360W,
Thrust to weight 1.1 to 1,

So it looks like I can shave quite a bit of weight of by not having that hulking great 5S in there ...

Looking in my spares box - I only have a 3530 1100kv so :

I then entered 1.2kg
3S 3000
50A ESC
TGY 3530 1100kv
APC 10x6
=
11mins
257W
1.09 to 1

If I up to a 4S and drop prop back ...

1.2kg
4S 3000
50A ESC
3530 1100kv
APC 8x6
=
13mins
309W
1.2 to 1

VERY INTERESTING !!

The question then remains about launching ... looks like maybe need to look at retracts being fitted t avoid the hand launch scenario - its a big model and no way for own to do it - must be second person. Or a 'dolly'

Hi Nigel :) Use a 8x8 APC Prop on 3 or 4 cells, it will be powered very close to a V900
https://www.flitetest.com/articles/s...-basic-release

solentlife 11-05-2019 11:31 AM

V900 .... looks like a smaller version of the EFX Racer ...

We have a club member who has the Voodoo .. another version of the same ... screams round the field ...

The F16 of this thread though is heavy and I think its going to need a prop to get her up and flying as well as speed. Why I plump for a 1100 - 1400kv range ...


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