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Jan 14, 2019, 06:13 PM
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Lynxman's Avatar
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Speed 400 Pylon Racer


I bring you "Nucking Futs" (hope that name isn't taken yet). A Speed 400 class pylon racer for 28 mm motors. I just started on it a couple of hours ago. Should be done quickly.

720 mm wingspan
MH-42 wing profile
6 mm carbon tube spar


EDIT:
Files available here:
https://cults3d.com/en/3d-model/vari...peed-400-class
https://www.thingiverse.com/thing:3358880
Last edited by Lynxman; Feb 18, 2019 at 07:36 PM.
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Jan 14, 2019, 11:47 PM
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Very nice! You are the best.
Jan 15, 2019, 03:24 AM
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Thoemse's Avatar
Just what I have been waiting for. I was about to buy one but I'd raher print one.
This should be good!
Jan 15, 2019, 06:05 AM
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Mattestrom's Avatar
AWESOME!! There is a pylon racer on thingiverse that I've printed and flown, works great! Looking forward to printing this one
Jan 15, 2019, 07:36 AM
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japim's Avatar
Nice. I can't wait to see it finished.
Jan 15, 2019, 08:03 AM
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Hell Yeah! Count me in, I will definitely print this one!

If you may be bored in future...
A F5D sized (~1,4m wingspan) racer would be great, too!
Jan 15, 2019, 09:54 AM
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Nice, was thinking 3d printing would be a good fit for this type of model.
Jan 15, 2019, 09:54 AM
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Lynxman's Avatar
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Maybe a F5D will be in the future. I might make a 1,4 m slope soarer too. I have lots of projects going at once now. Thinking about designing another car too.
Jan 15, 2019, 04:04 PM
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Lynxman's Avatar
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So far so good. Here's the current state of the fuselage. 60-90 g depending on print settings. I think I will go for strength on mine because it needs to handle extreme temperature changes in the arctic winter. I think belly landings will be devastating to the plane if it's light too. I will cut it ou for smaller printers. The plastic budget is 200-300 g.

NOT FINISHED so no smart comments please. https://www.thingiverse.com/thing:3358880

I don't know if the nose is long enough. 3D printed planes tend to need longer noses because of the heavier material. That's easy to change when I find out. It has room for 8 cell NiMh 1100 mAh or small lipos. 28mm outruners wil be hard to fit in the nose without the wires rubbing on the can, but it's not made for that.
Last edited by Lynxman; Jan 15, 2019 at 05:06 PM.
Jan 15, 2019, 05:40 PM
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Mattestrom's Avatar
I have a request for the wing, not sure if it is possible, but... If you are going to use a carbon spar, it would be very nice if it would sit inside the wing instead of on the bottom.. So that it is hidden by the skin of the plane..
Jan 15, 2019, 09:36 PM
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Lynxman's Avatar
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Yes the spar will be in the middle of the wing.

Here's the finished fuselage so far. There are probably problems that need to be fixed, as usual with fresh designs that haven't been printed, but it's done. There's a channel for a 1,2 mm wire to the elevator in the fuselage. There's a reinforced battery bed in the main compartment. I think it will work well. All fuselage joints have lips for extra glue adhesion. There are two cooling inlets by the motor and two exhaust in front of the 9g elevator servo.

Maybe I will add a hatch on top of the nose for easy battery replacement so that the wing doesn't have to be removed.
Last edited by Lynxman; Jan 15, 2019 at 09:44 PM.
Jan 15, 2019, 09:42 PM
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Lynxman's Avatar
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The wing is also done. The slicer tells me it will weigh about 100 g in plastic, which is great. There are bays for two servos under the wing. Either 20x20x9 mm sub micro servos or 24x24x8 mm thin wing servos. I have some Turnigy digital sub micro servos that I like to use in small things.

All that remains to be designed now is the horizontal stab.
Jan 16, 2019, 01:03 AM
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Mattestrom's Avatar
Love it ��
Jan 16, 2019, 03:43 AM
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Just some thoughts.

The motors get usually pretty hot in those planes, so it might be not a bad idea to print the front parts of the fuselage with PETG at least.

Personally I like more direct linkages for T-tails, especially when the planes are fast.
So I would prefer a servo sitting in the vertical stabilizer, with a short pushrod attached to the elevator.
Jan 16, 2019, 12:09 PM
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Mattestrom's Avatar
Quote:
Originally Posted by apocalypsedude
Just some thoughts.

The motors get usually pretty hot in those planes, so it might be not a bad idea to print the front parts of the fuselage with PETG at least.
Maybe a version where you glue a plywood motormount from the inside?


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