There's something new in the works

[DreamMachine]

I'm hoping to reach 150 with it. I have an XL2 on the way in case I need to run 8s but I think 6s should be enough to reach the 140's

 

[DreamMachine]

Great success today. Got to test the poseidon against the leopard and I've got to say I'm impressed big time with the poseidon. The leopard pushed a little more rpm on the same gearing but ran hotter. The poseidon however pushed even taller gearing and was running higher watts then what there rated for. In fact it was running well over a 1000 more watts than they claim it runs. The leopard was also pushing way more watts too, like 2000 more watts. The leopard was pushing out an easy 1 hp more than the poesidon but it just ran to hot.

The setup now is very stable and I can stab full throttle so much sooner. My best run today was with the poseidon at 123mph. The best the leopard ran was 119mph. On the same gearing the leopard and poseidon were at 119 and 118, then I geared up and made a pull on a battery that already had 3 runs on it and pulled the 123. I'm pretty sure that on a fresh pack and full throttle a little sooner ill break 125mph. I believe with some work I might be able to eek out 130mph on 6s but I know if I'm going to take down the fastest rusty I'm going to have to go 8s.

 

[DreamMachine]

 

[Rolex]

Oh, YES. Now it LOOKS fast. I know you'll hit a record.

 

[DreamMachine]

Haha thanks dude. I just can't stop staring at the truck now with the savage body on it. Its just so sick lookin

If I break 125mph ill have the fastest hpi vehicle until the aussie pulls out 8s on his vorza.

 

[WoodiE]

I don't think the RCNT decal has ever gone this fast before. Can't wait to see more videos!

 

[Rolex]

Just wondering, if you cut out just the rear window, the low pressure area would only be able to draw air UP from the bottom, possibly causing a little extra "Suck" to hold it to the road.
Just wondering....

 

[DreamMachine]

Woodie you said they would make the truck faster

With all my other trucks with this body I havent noticed any lift. I have had this body up to 95 mph twice and over 90 a third time but then I wrapped it around a pole LOL. If I notice any lift then ill cut the window out.

 

[DreamMachine]

Didnt go faster today but maintained the same speed. Also had a bad crash (deleted the darn video FML) anyhoo I popped one of the GRP tires. Nothing broke other than that.
First pull was 123mph, second pull was the crash at 96mph, all the other pulls I was stuck at 115mph. I ran the poseidon, Leopard, and HPI 2200kv. The poseidon runs strong but I think I'm over geared and the temps never passed 145F even with the tallest gearing of 37/27. The leopard does not like tall gearing at all, it gets hot very quickly. The HPI 2200 did very well actually. On 1:1 gearing it pulled 115mph and temps were 122F on the motor. Dropped in 37/34 and it pulled 115mph again and the temps were around 125F. Very pleased and hope to do more testing next time.

I would have more data graphs but I forgot to charge my laptop

---------- Post added at 7:43 PM ---------- Previous post was at 7:41 PM ----------

this was the graph I got from the 123mph run on the poseidon. Not bad considering they rate the motor at a max 3200w lol

 

[wwit]

:thumbup:

nice job and well done. I'm amazed just how fast that this is going. Not so much from the electronics and gearing which are capable of even more speed. But just from the overall vehicle design and body choice opens my eyes a lot. Neither were ever meant to run at even close to half that speed...more like maybe a 1/3 at best.

And I think your really on to something. That body was never intended to make down force and it creates drag. The open tires create drag. But somehow you have managed to get a decent balance to it so it doesn't blow over to easily once you get up over 65ish mph. Well except that one time in your vids

And its really cool that your doing this as a learning process and its not a XO-1. I have a 1:1 racing background and have a good working knowledge of how to make things go fast. When I first saw pics of the XO-1, mainly underside pics, It clicked in my head that there was going to be a problem with that flat sealed bottom creating lift at speed should it bounce and get even a small amount of air under it. Watching many YouTube video's later told me my suspicions were dead on. I get a chuckle out of watching some guy destroying a brand new XO-1 from just hitting a pebble in the road. I'm not cruel , buts that's just funny.

Keep at it. I think your going to hit 150 eventually. Though your at that point where even picking up another 1mph at a time is going to get tougher with every little mod or tweak.

I've had the idea of doing similar from time to time. I have the model building and design experience to build something like that. But never have ever considered anything more than 75mph as a max speed. But for me, I live in what used to be the sticks when I moved here 30 years ago. With the growth of the area, there isn't a open patch of road with in an hour at least where I could even think about being able to run something like that. Too much traffic 24/7 who would gladly treat such a vehicle as a target to run over.

 

[DreamMachine]

Thanks dude!

Right now I'm trying to figure out how to break 125 much less reach 130 on 6s. Something tells me that I'm over geared. The reason I say this is if a almost 10lb vorza can pull off 125mph with a stock hpi 2200kv on 6s I should easily be able to do the same. The two different gear sets I've tried 37/30 and 37/27 both yielded the same speed (123mph) the motor I have clearly makes the power but it's a matter of finding that sweet spot. My next outting I'm going to try 1:1 gearing and slowly make changes from there.

Now I've been trying to find the answer for a week now on if I have to much resistance in my setup. Electrical resistance that is. The XL2 comes with 8mm bullets to begin with but I took them off and put on 6mm. Also like a complete noob I cut the darn wires instead of just peeling the wire cover off to mount in the cap pack. I'm seeing current spikes which are huge 300A on a 200A ESC. My ripple is in the good range which tells me my batteries are doing fine. But with the plan to eventually go 8s I've decided to use the castle 6.5mm connectors and put back on the factory 8mm bullets. I'm also going to put the cap pack on like it should with out my noob mistake. I'm hoping that these changes will allow for more power to hit the ground instead of being wasted.

 

[DreamMachine]

Didnt go faster with the poseidon motor but pulled off some insane numbers with the hpi 2200 motor. I've found the sweet spot with it and boy was I surprised. My next outting ill be putting 8s through it!

---------- Post added at 3:49 PM ---------- Previous post was at 3:44 PM ----------

 

[wwit]

Wow that's going great. Very respectable speed and then some.

Just curious. Why the second GPS? Just in case back up sort of thing? Trying to find every little extra at this point, maybe take one out and see if it can pick up anything with less weight.

I'm glad your doing this and not me. It would be driving me crazy where I could find the little things that add up and take away speed. Weight , drag and friction, but how to maintain the balance you have is incredible. That thing should not be able to do what your doing with it.

Just a quick thought. Its been proven many times that dull surfaces on regular full size vehicles have less drag than glossy surfaces do. But people love shiney, which is why you don't see dull NHRA or Nascar race cars. But would be another possibility to spray the shell's outside with a clear matt type spray.

Dang it, its your project and its driving me crazy

 

[DreamMachine]

Well thats a crazy thought you have there. I believe the underside of boats arent glossy either. So that would support the theory

Thank you for watching and your support

 

[hamz9561]

Have you also thought of turbulence inducing fences like on the Mitsubishi Evo or large airliners?

 

[DreamMachine]

Have you also thought of turbulence inducing fences like on the Mitsubishi Evo or large airliners?

Not going to lie, I have no idea what you mean lol

Something similar to the hood cuttout in the evo hood?

 

[Rolex]

Rather than just flat paint, I think I'd go with a light coat of spray Plasti-Dip. It would have that slight texture that it needs to disturb the surface.
I'd also cut out the rear window since it creates drag.

 

[hamz9561]

The air fence is the tooth-shaped devices above the rear windshield that generate vortices and help the air stream to stick to the back end of the car.

 

[DreamMachine]

Ahh I see, thank you

 

[Nitro4910]

DM have you managed to push through 8s yet on your Wheeled Missile yet?