H2O2 Tip Jet
Join Date: Feb 2008
Location: Manitoba Canada
Age: 72
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Previous models were using 93% and higher concentrations of hydrogen peroxide but the latest ones are using as low as 70% solution. The lower solution uses either an additive or something different in the silver screen catalyst. (From memory and subject to correction.)
They have designed a nice small tipjet and are also testing a 2 person model and results are good. There is a dedicated company to supply and ship fuel worldwide in an approved and regulated manner.
Fuel is expensive and so far I have not found consumption rates published other than mentions of "high consumption" so I am guessing that will be the downside.
I love tip jet rotors , they are utterly simple with only one moving part. Hopefully fuel supplies can be increased and costs brought down but it will probably require a breakthrough in that department.
They have designed a nice small tipjet and are also testing a 2 person model and results are good. There is a dedicated company to supply and ship fuel worldwide in an approved and regulated manner.
Fuel is expensive and so far I have not found consumption rates published other than mentions of "high consumption" so I am guessing that will be the downside.
I love tip jet rotors , they are utterly simple with only one moving part. Hopefully fuel supplies can be increased and costs brought down but it will probably require a breakthrough in that department.
Join Date: Feb 2008
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I thought tip jets did not require a TR ( or mid rotor in this case ).
However I have seen the video of the 2 place peroxide powered prototype and it looks like are back to using vanes on the boom . The video was mainly head on shots and it was hard to see the boom , but yaw authority looked good. Probably was a calm day. Personally I hope they stick with a low thrust tail rotor that only needs to handle crosswinds.
Controlling it must be weird at first if you're used to flying helicopters with a conventional arrangement of cyclic control, ie push the cyclic forward to tilt the disc and move in the same direction.
Unless I've picked it wrong from the video, it looks like the head is just a fan on a stick type setup, so to tilt the disc forward he's pulling back on the handgrip - I guess you'd get used to it, but still... I once went for a fly in a weight shift trike with a mate, and after a long time pulling back on the stick to pitch up, it was bloody strange to have to push out on the framework to keep the nose up in a turn.
Anyone had any bad experiences transitioning between control setups along these lines?
Unless I've picked it wrong from the video, it looks like the head is just a fan on a stick type setup, so to tilt the disc forward he's pulling back on the handgrip - I guess you'd get used to it, but still... I once went for a fly in a weight shift trike with a mate, and after a long time pulling back on the stick to pitch up, it was bloody strange to have to push out on the framework to keep the nose up in a turn.
Anyone had any bad experiences transitioning between control setups along these lines?
Join Date: Aug 2007
Location: London
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Dragonfly jet-powered helicopter runs on H2O2
Not sure if this has been posted before.
Dragonfly jet-powered helicopter runs on H2O2, shuns traditional tail rotors (video) -- Engadget
check it out flying here
YouTube - H2O2 helicopter demo test tip-jet Dragonfly DF1 2009
could rocked powered blade tips be added as a safety feature?
cheers,
Clayton
Dragonfly jet-powered helicopter runs on H2O2, shuns traditional tail rotors (video) -- Engadget
check it out flying here
YouTube - H2O2 helicopter demo test tip-jet Dragonfly DF1 2009
could rocked powered blade tips be added as a safety feature?
cheers,
Clayton
Join Date: Feb 2008
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Some of the earlier tests were done with what amounts to a gyrocopter rotor head. Not sure why they chose that route.
Later testing uses a typical helicopter collective + cyclic which is the way it should have been done in the first place. Even a twist grip throttle can be used to control the peroxide flow rate.
Later testing uses a typical helicopter collective + cyclic which is the way it should have been done in the first place. Even a twist grip throttle can be used to control the peroxide flow rate.
