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Well I wish I could pedal that fast. I bought a bike to cycle with my son this summer and recently I had this crazy idea to use my bike as a test bench for my turbine engine. a bit of fiddling and two weeks later here it is.
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I have some video footage of it which ill post as soon as I have uploaded it.
Possibly the best first post ever.
Welcome to STW!
😯 think i'd be wanting some 203mm dics brakes
I want to see a video (if you survive)
You art 'hot rod' and i claim my £5.
What could go wrong. Please please film it.
Top first post, and cool toy. But not quite batshit mental enough...
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Lol those videos fill me with confidence 🙂
A bit more about the bike and the engine. The power output of the engine is about 10 kw. But that power pushes against the air and isn't linked to the wheels, and this makes the acceleration different. The thrust from this engine doesn't push you back into your seat and if it did the engine would be much larger and your top speed would be a couple hundred miles an hour.
The power delivery is like a straight line on a graph. A bit like pulling off in your car in fourth gear and watching the speed rise at a constant rate, and still end up going quite fast. The cost of adding an engine like this actually less than most think, and costs alot less than most high end bikes.
I have only tested the bike on rough wet grass, and with the narrow wheels the resistance was very high. in the video I go from 0 to around 25m/h in roughly 120 meters, the bike was still accelerating but was starting to slide, It felt like I was in mud so didnt push it any further. As soon as this crappy weather clears up ill give it a go on a much smoother surface. The video is quite short ill get better footage next time. Oh, and the sound is AMAZING 8)
As above, great post!
We need more stuff like that on here 🙂
10KW? Gonna be fun 😀
So how do you know/what makes you think, that it goes 60mph?
Just an '[i]educated[/i]' guess, here is a guy who got around 50mph on his [i]Mountain[/i] bike, using an engine that has nearly 50% less power than mine :P. And my bike has thinner road wheels than this mountain bike with less road resistance so the top speed might be even faster than this, if i have the gonads to push it :?. Any one have a spare set of leathers handy?
The other dude might have half the power but he did bother putting a helmet on! Best of British luck to you 😀
Please make sure your next of kin knows where to post the video.
Great idea though. 🙂
What's the engine for originally?
Be brilliant on a tadpole trike.
60mph with a couple of litres of jet fuel between your legs. What could possibly go wrong.
A bit more about the bike and the engine. The power output of the engine is about 10 kw. But that power pushes against the air and isn't linked to the wheels, and this makes the acceleration different. The thrust from this engine doesn't push you back into your seat and if it did the engine would be much larger and your top speed would be a couple hundred miles an hour.
What if you tried it out on a conveyor belt that goes backwards at the same speed the wheel go forwards?
Love this thread, nowt like shed engineering.
Wish I had the time to do stuff like this.
I always thought the batman vehicle line-up was just missing [i]something[/i].
Possibly the best first post ever.
Welcome to STW!
Oh, and that!
Forget e bikes!! Sounds awesome and a great post. Love it
This is amazing!
Will the turbine run on LPG?
In which case you can [url= http://www.asciimation.co.nz/beer/ ]chill your beer at the same time[/url] (It was probably STW that led me to that in the first place).
That dude was rapid and I think you'll probably end up a fair bit quicker going if what you've said.
Good luck sir and god speed ?
I hope we won't be seeing you on LiveLeak anytime soon? 😆
Well I have a trike and it sports a sturdy rack :-). Where do I sign? Sorry, no leathers.
Great stuff.
Tick!
I'm happy that all the responses are positive, was a bit worried that I was going to get slated by the "[i]bikes aren't meant to create pollution[/i]" junkies
in response to some posts:
Gaidong: I will definitely wear a helmet next time I have a go on a harder surface, and hopefully some leathers. It will be safe up to speeds the bike can handle, which is probably faster than my gonads will let me.
Epicyclo: The engine is used for a drones and generators. I'm sure a tadpole trike will be very quick with one of these.
Ps44: This particular engine runs on normal heating oil mixed with bearing lubricant. I have a high impact fuel tank on the bike which is placed within the A frame, and I feel that in this configuration its probably safer than a normal motor bike with there aluminium tank on the top of motor bike frame. I can also tweak the engine to run on diesel, so in case of a ruptured tank the leaked fuel shouldn't ignite .
Tired: Even my wife thinks its cool, she says I should sell these as a bolt on package for others. Will think about it if there is enough interest.
good job you didn't fit an electric motor. you would have been scorned...
[quote=jetbike ]Just an 'educated' guess, here is a guy who got around 50mph on his Mountain bike, using an engine that has nearly 50% less power than mine :P. And my bike has thinner road wheels than this mountain bike with less road resistance
I doubt the wheels and tyres will make any significant difference - at that speed it's almost all about air resistance, so less flappy clothing will help, or more of a tuck if you dare. 73% more power required for 60 rather than 50 - though I presume with jet engines (as you kind of suggest) that the thrust generated is fairly independent of speed, in which case 44% more thrust required.
Have you any more details of your engine - is it based on plans from somewhere, or all your own design (not that I think I'm ever likely to build one, but interested in the idea)?
Good to see that the valves and logos line up.
Well done. Have a gold star.
I'm taking that star straight back off him for the wheel reflectors.
Seriously I'd get rid of those if you're planning on going anywhere near 50mph - they won't do anything for your wheel balancing and you'll get vibration.
[quote=jetbike]my bike has thinner road wheels than this mountain bike with less road resistance
If I was going to do this craziness, I'd be running the heaviest, thickest, strongest bicycle wheels and tyres I could find. And thick inner tubes with slime in.
You are mental 🙂
I'm taking that star straight back off him for the wheel reflectors.
Safety NEVER takes a day off.
[quote=CaptainFlashheart ]Safety NEVER takes a day off.
Which is why I'm telling him to take the wheel reflectors off 😕
They have almost zero safety benefit in any case.
What if someone wearing a helmet light is approaching from the side on a rocket powered skateboard, eh? That side visibility could be a life saver then, couldn't it?
In which case he just needs to go a bit faster.
Flip your stem and that will give you 5mph probably
Do all jet bikes have to be Giants?
I applaud your bat shit craziness!!
Do all jet bikes have to be Giants?
They might be....
Ooh, well played, CFH - I see what you did there...
Best thread evaaaaaaaaaaaaa! I think I'd want Moar aeroz/brakes though!!
Hmmm. So what's the difference betwwen a turbine engine and a jet engine?
Need more information as i want a jet engine, i 'd be happy enough to fire it up and just just listen to that shut down whine.
What's the rough estimate for such an engine/electronic control gear?
*goes to check British ENDURO Series rules*
I love these kind of experiments 🙂
If you're in North England or Scotland I'd gladly test it for top speed if you're apprehensive or just simply want to live longer.
Brilliant!
Could you bolt one to the bottom of my Volvo XC90 please? Cash waiting.
Great bit of bodging going off there 🙂 ....Trouble is that there's virtually nowhere you can use it safely and legally.....
which is of course what makes it great....Trouble is that there's virtually nowhere you can use it safely and legally.....
@ PeterPoddy: well this is what Jeremy Clarkson had to say about it in this video, not sure if any of this has changed since. For now I'm treating it as being illegal on public roads. But there are plenty of back roads and tracks nearby I can go on.
Shermer 75: This is technically a Jet Engine, not sure why the industry call small jet engines 'Turbines'. A turbine is essentially a fan shaped object that has a medium passing through it making it rotate.
Somafunk: If you want something small just to run in your back yard I can help out with that.
Trademark: I do live in north England, Cumbria in fact. if you near and want to come have a look then let me know.
Caspian: I can bolt on of these to pretty much anything 🙂
Meanwhile I've gone and checked the pricing.
Tadpole trike + 4 of those motors would be more fun than just about anything. Maybe it would be safer (that being a relative term) using a gokart chassis.
Just imagine the fun of reverse thrust braking.... 🙂
Edit:
This could also revolutionise kayaking...
Caspian: I can bolt on of these to pretty much anything
Just sayin 8)
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[quote=jetbike ]Shermer 75: This is technically a Jet Engine, not sure why the industry call small jet engines 'Turbines'. A turbine is essentially a fan shaped object that has a medium passing through it making it rotate
Well technically I think it's a jet turbine or turbojet - as opposed to a pulse jet or ram jet which doesn't have rotating parts. Assuming it does have a rotating compressor and turbine?
Now THAT looks epic fun!!!
Good news. I went out on the bike this afternoon and I'm still alive, and I have some more video to upload 8)
Aracer: thanks for the heads up on the wheel reflectors, I thought I was getting a strange wobble coming from them.
have you got a link for the engine?
Well here is the first video, building up the guts to go faster on each run. The footage was taken with my phone and the wide angle lens makes it seem slower?. At around 40mph the steering felt a bit shaky might need a steering damper, or maybe it was me shaking because I was so cold.
Trademark: I do live in north England, Cumbria in fact. if you near and want to come have a look then let me know.
That's great, thanks jetbike.
I'm NE England but regularly in Cumbrian hills.
Cheers.
That is just bloody great.
Love the noise when you zoom past.
The world needs more loons like you.
Have just upset the dogs listening too that. AWESOME, now when are you flogging one with full reheat!
the noise is just ridiculous - sounds like it's been dubbed. love it.
Agree with Ming. Afterburner needed.
That's ****ing brilliant!
Where abouts in Cumbria are you?
Here is the second video. The afterburner for this would be cool but they very thirsty.
Reached 45mph on the last video, I was still accelerating but my bravery was running out.
Careful getting your leg over
Does your foot pass through the engine exhaust when you mount like that? 😯
Also watch how you build up speed. A lot of road bikes build up an oscillation at certain speeds on certain surfaces because of the harder tyres and buildup of surface vibrations. Less of a problem with mtb because the softer tyre acts as a damper. Google shimmy or speed wobble!
Otherwise -awesome and looking forwards to more!
Max looniness!
Afterburners please.
Keep it coming... 🙂
Slacker head angle would help with steering stability (steering axis is further in front of the contact point). Probably not that helpful now I know.
Keep up the good work!
thenorthwind - Member
Slacker head angle would help with steering stability (steering axis is further in front of the contact point).
No, steeper with more trail.
Very nice.
Just out of interest don't the wheels need to be balanced when doing high speeds?
Mikeypies: There isn't a link, but if you want to know more just email me at gbjetbike@gmail.com
Breadcrumb: I'm in Penrith. Email me if you want to pop by.
Because there is little need for pedalling efficiently, you could do some pretty drastic things with your riding position to get your body lower and flatter. There are some big gains to be made in reducing air resistance! The gravity bike suggestion is spot on.
The noise on that is awesome, seriously awesome
Props
oh... hang on...
very cool effort there but at the risk of being a killjoy, probably best not to do it on a public road or do it next to any fields with livestock in them - you don't want to start animals panicking and running into fences etc. Other than that, top marks!
Absolutely fantastic!
Can I join the waiting list to get a car conversion kit please. 😆
myoptic: no my leg doesn't pass through the hot gases. The hot air mixes very quickly with the surrounding air and cools very quickly. Makes for a nice had warmer at half a meter 🙂
[quote="chestercopperpot"]
Just out of interest don't the wheels need to be balanced when doing high speeds?
Don't think 60 is close enough to "high speeds" to make it an issue, unless they are buckled or otherwise knackered.
I mean, road wheels aren't balanced and I've had knocking on for 70 going down some mountain passes. And probably only 10-15mph slower on the mountain bike.
60 is probably high enough for the unbalance due to the reflectors to start to cause issues, as that will make the wheel far more out of balance than normal 😉
Breadcrumb: I'm in Penrith. Email me if you want to pop by.
Might do. Hat's off to you!
Dropped bars, aero tuck, lycra, and then you'll need disc brakes.
Kinda think I recognise that road!
Brillaint effort, love it! Def needs strapped to a different bike though!
I reckon we chip in to pay Jedi expenses from Herts up to Cumbria!