jetric
Veteran Member
Joined: December 2014
Posts: 130
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Post by jetric on Sept 2, 2018 11:44:24 GMT -5
Hi All, Just posting a short video of a three second start-up of my design of DIY turbojet engine that is fitted to my brothers jet propelled kart. The test was performed to prove how quick you could start a well designed DIY jet engine. The engine uses a single standard Danfoss fuel spray nozzle and a Bosch 044 efi fuel pump that is controlled by a PWM speed controller to vary the speed of the fuel pump as the throttle, The maximum P2 pressure is 55psi at 100% rpm.
Richard S.
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CH3NO2
Senior Member
Joined: March 2017
Posts: 455
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Post by CH3NO2 on Sept 2, 2018 14:14:51 GMT -5
Wow! Very nice. You have that turbo well dialed in.
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Post by stoffe64 on Sept 3, 2018 7:56:26 GMT -5
Very Nice indeed that engine!
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Post by turboron on Sept 3, 2018 14:51:30 GMT -5
jetric, please provide the step by step details you used to achieve the 3 sec start.
Thanks, Ron
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Post by racket on Sept 4, 2018 16:47:20 GMT -5
Hi Ron
Lotsa starter torque/HP required , and a nicely set idle fuel flow on an engine that has a well matched comp/turb , but starter power is the most critical component in producing a fast start, overcoming the inertia of that big lump of Inco on the end of the shaft is paramount.
Cheers John
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Post by turboron on Sept 4, 2018 19:42:43 GMT -5
John, thanks for your insight. Is a powerful starter also the cure for hung starts?
Thanks again, Ron
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Post by racket on Sept 4, 2018 22:31:35 GMT -5
Hi Ron
Yep , we need to get the rpm high enough to get "over the hump", so ideally a starter with plenty of rpm capability if direct coupled or as with the impingement its able to keep supplying energy as the rotor rpm rise past self sustain and preferably up to a nice healthy idle speed.
Cheers John
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Post by airesearcht04 on Jan 24, 2022 16:43:24 GMT -5
Hi All, Just posting a short video of a three second start-up of my design of DIY turbojet engine that is fitted to my brothers jet propelled kart. The test was performed to prove how quick you could start a well designed DIY jet engine. The engine uses a single standard Danfoss fuel spray nozzle and a Bosch 044 efi fuel pump that is controlled by a PWM speed controller to vary the speed of the fuel pump as the throttle, The maximum P2 pressure is 55psi at 100% rpm. Richard S. Hello! Do you know which specific model of the Danfoss fuel nozzle that was used for this engine? There is plenty of them. I would be very thankful if you could answer that question!
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Post by racket on Jan 24, 2022 18:20:40 GMT -5
Hi What sized turbo are you using ? A hollow cone spray type is "preferable" but semi solid and even solid spray types can be used with suitable "adjustment" of the flametube design , a nice wide angle on the spray is also helpful , so 60 degree or above . Have you looked at "Fuel Requirements" jetandturbineowners.proboards.com/thread/680/diy-turbines just click on the icons Cheers John
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jetric
Veteran Member
Joined: December 2014
Posts: 130
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Post by jetric on Jan 25, 2022 10:26:42 GMT -5
Hi, As I was the actual person that designed and built that engine I thought I should give you the info. The engine used a single Danfoss 12gph 80 degree Hollow cone spray pattern nozzle. But as John has stated it all depends on the size of turbo you are using and how good your flametube design is. Richard S. Hi All, Just posting a short video of a three second start-up of my design of DIY turbojet engine that is fitted to my brothers jet propelled kart. The test was performed to prove how quick you could start a well designed DIY jet engine. The engine uses a single standard Danfoss fuel spray nozzle and a Bosch 044 efi fuel pump that is controlled by a PWM speed controller to vary the speed of the fuel pump as the throttle, The maximum P2 pressure is 55psi at 100% rpm. Richard S. Hello! Do you know which specific model of the Danfoss fuel nozzle that was used for this engine? There is plenty of them. I would be very thankful if you could answer that question!
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Post by racket on Jan 25, 2022 17:17:14 GMT -5
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Post by airesearcht04 on Jan 27, 2022 7:24:30 GMT -5
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noshell
Junior Member
Joined: January 2020
Posts: 75
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Post by noshell on Jan 29, 2022 3:25:04 GMT -5
Thats a small combustion chamber!
How did you work out how to build it?
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jetric
Veteran Member
Joined: December 2014
Posts: 130
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Post by jetric on Jan 31, 2022 4:10:53 GMT -5
Hi, I designed the flametube to utilise a toroidal vortex in the primary zone to anchor and stabilise the flame in the primary zone, this is how I can make a compact short combustion chamber. Richard S. Thats a small combustion chamber! How did you work out how to build it?
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noshell
Junior Member
Joined: January 2020
Posts: 75
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Post by noshell on Feb 6, 2022 4:05:14 GMT -5
Hi, I designed the flametube to utilise a toroidal vortex in the primary zone to anchor and stabilise the flame in the primary zone, this is how I can make a compact short combustion chamber. Richard S. Thats a small combustion chamber! How did you work out how to build it? Im struggling to understand what you mean by that. Do you have any photos of yours or what you based your design off of? Ive been researching what "real" jet engine combustors look like... Infact ill post an interesting link. youtu.be/VyLM3x4qdcI
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