mwnilsson

@Marxpek No havent done any more design improvment. Maybye later... Dident know they have internal resistors! dont know about lego led.

@Marxpek welcome to the forum! yes it seams we already met. Here I have doing free promotion of your work :-P ( for my own purpus but still)

Got beaten by 1km/h but it tock 3 batteryboxes 4 buggymotors and 3 wheel drive

No need a second v2 reciver for it to work ok with buggy motors

I dident mean i regect gps just that it isent perfect. And now that another person has made a car whit simular futures as min and got better results it suggest that my speedcomputer isnt so inaccurate. If you film the 10m stretch you dont have to stopwach it at 24fps you could time it accurate to 0.04sec just going frame by frame on your computer

He has posted his video of the 29,44Km/h (GPS) Car and it has the same gear ratio as min but a slightly bigger wheel But everything els I think is wors than my 27Km/h Car: The surface of the track he drives on, The back wheels is like the most rolling resistant ever of a lego tire ever, The overall size of the car is bigger. What do you people say? @Boxerlego @MangaNOID @Horace T @Sariel At least this woud suggest that my speedcomputer isent showing more speed than my cars are driving!?

its a loading dock for trailers so the slope is from the house and out for draining. If you see on the video I was driving alongside the house and it is super flat apart from some irregularitys in the payvment. And the world record claiming is just for fun it rubs folks the wrong way... But i havent heard anyone gone faster

Got some competition on youtube! A guy say he drove 29,44Km/h. So I had to break the 30 mark before someone els did! Simply put a V2 reciver and PF Battery Back om my last car and it did the trick so 2 remotes one for each motor :)

Thanks! no that one is heavy modified! the cylinders are drilled at 2mm on intake/exhaust-ports and switches are drilled and the "step" in them is removed. If I had a more reliable airtank (scuba) and a air pressure ragulator it would be seriusly quick! According to http://www.nico71.fr/otherpages/LPEtools.htm It puts out 88W at 3bar@1370RPM (unmodified would be like ~100rpm and 3w)

So if I where to display max rpm on my speedrun and then self calculate the result would that be ok? so the question is do the lego speedcomputer say 100rpm if it is 91rpm or 109rpm(or somewere in between) it looks so if you messure a electric engine. in that case the margin of error would be if I just tock rpm and for my wheel 0,000256km*20rpm*60 thats +-0,15km/h or 0,3Km/h how you see it I dont know what accurasy you get on your bike app but min at 16 sattelites conection was down to 3m! and thats fine when you drive at a constant velocety but not if you accelerate the hole time then it would display less. And lets face it at 20km/h you could run 50-100m but at 30km/h its impossible! Thanks! Sorry dont have any Lego Train parts and have never been a train guy :-) They ar bigger and heavier so more drag and more friction. I would like 2 racing slicks on front :-) Yea the motorcross tire woud be more rolling resistance but it suited my gearing better.

My speedcomputer dispalys my diffrente electric motors at the rpm they are supposed to spin at so i dont think its unaccurate. GPS can be unaccurate at small distances and is best att average speeds there is a wide margin off error. I can se on your video when you take a photo of your gps data standing still it display your speed at 1,8km/h. Have you tried speedcomputers to mesure rpm to be unaccurate to? or is there something wrong whith the actual calculation in the computer? If i were to use a phone it wouldent be made intire out of Lego.

This is awsome! But then I need 2 V2 recivers because V1 cant drive Buggy Motors proper BTW is it safe to use the other 2 ports on the recivers to a second engine?

I dont need better traction. A so high geard buggy motor dont have that power to spin the wheels. I dont have bearings (like the thrust ssc) so the more wheight the more friction and less power to generate speed.

@Horace T Thanks! Thinking of getting covers for the wheel sides but it would mean more rotational mass and more weight resulting in more friction so i dont know. Wheigt saving could be don but at the cost of rigidity and aerodynamics so its a hard traderoff and I dont know what will result in higher speeds.

@JJ2 Thanks! Well all lego steering has som play in them and that would generate som friction and loss of speed! @technic_addictyea I whent whit the L-Motor because the XL-motor would have to be geard up by 4 gears instead of 2 so less friction. In the first car I have 2 V1 and in the second 1 V1 and 1 V2 (just to try it out) As far as I know Lipos are 7,2V or like max 8,4V maximum charged as usual Alkaline battery out of the box is lik 1,66V (9.96V for 6x) but the weight is higher. Dont have Lipos but i think that the extra voltage would be better so assumably less speed in a Lipo car.. @Offroadcreat1ons Thanks! Yes I think it should be original lego parts only and not modifyed! Exept for LPE these are so slow when not modyfied that its patetic:-)