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JH Speed Deamon - a foamboard pylon racer

FAI-F1D

FAI-F1D

Free Flight Indoorist
#102
#102
james90755 said:
have seen the speed wing... just didn't put two and two together I guess. Do you feel his wing design is faster?
Click to expand...
There's no comparison. Combining a smooth wing (no undercambered sections or sharp transitions) with ironed edges has made this one of the most efficient foamboard planes I've ever built. Well, that, and no rubber bands adding drag.
 
Yusernaym

Yusernaym

Well-known member
#103
#103
Do you have plans for the updated version? I've been wanting to build one of these since soon after I started flying earlier this year, and I finally have the power system to do it right. A friend of mine gave me a 2845 2750kv motor that can take 6s, which would be a perfect fit for a Speed Deamon.
 
BATTLEAXE

BATTLEAXE

Well-known member
#107
#107
Yusernaym said:
it's out of an edf, so I don't know if I'll trust it with a big prop straight away. It's branded as a Predator, but aside from that I don't know much
Click to expand...
That's what I thought. Because it is out of an EDF which really only spin comparatively small fans compared to larger props it makes sense. I would say you would need a serious ESC to handle the loads. Do some bench testing to see how it fairs.
 
mrjdstewart

mrjdstewart

Well-known member
#109
#109
sorry, don't mean to be a jerk. :sneaky:

i need to revisit my foam demon. it has an T-motor F80 that can run on 6S, but i use 4S. i think it's the cheap esc i have installed. i am in the process of switching all of my balsa demons over to Opto ESC's w/external BEC's to reduce size and significantly increase Amp and Voltage. i think i may do the same with the foamy and see what happens.

laters,

me :cool:
 
J

james90755

Member
#110
#110
A couple of comments on what I have done lately with this plane.

I have cut a couple inches off the wing, elev, vertical stab to see what would change. Maybe less drag, no change in stability until I cut 100% of the wing tips off... back to where the underside of the wing ends, maybe around 5" per side. Maybe 2" per surface on the tail.

Still flies well, but can get a little temperamental at<30% throttle. Good times.
 
J

james90755

Member
#111
#111
Now I am thinking about putting EMAX 4030 on it (I am guessing this is about same as FT Monster motor). 6S 4000 70c and a 16x10. Battery will barely fit, motor mount will just fit on the nose. Not sure that I can get this to balance... maybe move the wing a little more forward.

Am I crazy thinking this would work?
 
The Hangar

The Hangar

Well-known member
#112
#112
james90755 said:
Now I am thinking about putting EMAX 4030 on it (I am guessing this is about same as FT Monster motor). 6S 4000 70c and a 16x10. Battery will barely fit, motor mount will just fit on the nose. Not sure that I can get this to balance... maybe move the wing a little more forward.

Am I crazy thinking this would work?
Click to expand...
What motor is on it currently? My guess is that you'll have a lot more thrust but less top speed.
 
mrjdstewart

mrjdstewart

Well-known member
#115
#115
andrej said:
foam thickness 6 or 3 mm? I want to build this plane wingspan 60 cm, with motor 1806 2300kv and small battery 4S. In this size, will he be able to fly at a speed of 120-150 kmh?
Click to expand...
at 60cm probably not on a 1806 even with 4S. if you are sold on using the 1806 then i would recommend dropping to more like 40cm wing span. if not i would go to an f-pack sized motor (2205-2300kv) and use 4S.

i originally had an 1806 on my balsa mini-demon and it would do 80mph (128 kmh). now i have the 2205 on it and it is much faster, closer to 110mph using a 4S and 4.75x4.75 apc prop.

good luck,

me :cool:
 
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