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Post by hephaestus on May 4, 2019 12:04:30 GMT -5
Hey all,
Curious if you guys could point me in a direction...
I have this aeromax 103 sitting in the corner of the hangar, that purely for sh*ts giggles and converting hydrocarbons into smiles per hour reasons I think needs a turbine conversion. That and the rotax 503 with all the hop ups and new props we've thrown at it is unsafely underpowered
I've built a k66, a wren (I think it was 44) and some pulsejets in my younger years. Now early retired millwright (medical issues) - with a lot of fabrication tools -2 cnc Mills, cnc routers, 3d printers, plus a full shop and hangar of tools and equipment to build almost anything.
Are there any plans for something that might work? Is there any feasibility to scaling up one of the open designs (yes it's way more involved than just scaling, but it would give me a starting point)? I don't trust myself to do a full blank page new design...
I'd love to go low-mid bypass turbofan if possible. I remember a wren turboprop being converted like this - think it was an rcgroups thread but I can't find it for the life of me.
Anyone have some thoughts or advice?
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jetric
Veteran Member
Joined: December 2014
Posts: 147 
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Post by jetric on May 4, 2019 14:40:14 GMT -5
Curious if you guys could point me in a direction... I have this aeromax 103 sitting in the corner of the hangar, that purely for sh*ts giggles and converting hydrocarbons into smiles per hour reasons I think needs a turbine conversion. That and the rotax 503 with all the hop ups and new props we've thrown at it is unsafely underpowered I've built a k66, a wren (I think it was 44) and some pulsejets in my younger years. Now early retired millwright (medical issues) - with a lot of fabrication tools -2 cnc Mills, cnc routers, 3d printers, plus a full shop and hangar of tools and equipment to build almost anything. Are there any plans for something that might work? Is there any feasibility to scaling up one of the open designs (yes it's way more involved than just scaling, but it would give me a starting point)? I don't trust myself to do a full blank page new design... I'd love to go low-mid bypass turbofan if possible. I remember a wren turboprop being converted like this - think it was an rcgroups thread but I can't find it for the life of me. Anyone have some thoughts or advice? Hi, The easiest way would be to get hold of an aircraft shaft output APU turbine engine and fit it with a prop, the sort of engine you would be looking for would be a Lucas CR201 or Rotax 2023 off the Harrier jump jet, these produce at the output shaft 90hp at 3000rpm with 400nm of torque, or you could get a Rolls-Royce/BMW T312 from the Tornado fighter jet, these produce at the output shaft 150hp at 8000rpm, both of these turbine engines use around 1 Litre of fuel per minute at full power. As for the availability of these engine I have a friend who has a stock of these that are for sale. Here is a video of a guy in america who has successfully converted the Rotax 2023 turbine engine to a turboprop and installed it into his ultralight: Enjoy, Richard. |
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Post by hephaestus on May 4, 2019 19:15:34 GMT -5
Curious if you guys could point me in a direction... I have this aeromax 103 sitting in the corner of the hangar, that purely for sh*ts giggles and converting hydrocarbons into smiles per hour reasons I think needs a turbine conversion. That and the rotax 503 with all the hop ups and new props we've thrown at it is unsafely underpowered I've built a k66, a wren (I think it was 44) and some pulsejets in my younger years. Now early retired millwright (medical issues) - with a lot of fabrication tools -2 cnc Mills, cnc routers, 3d printers, plus a full shop and hangar of tools and equipment to build almost anything. Are there any plans for something that might work? Is there any feasibility to scaling up one of the open designs (yes it's way more involved than just scaling, but it would give me a starting point)? I don't trust myself to do a full blank page new design... I'd love to go low-mid bypass turbofan if possible. I remember a wren turboprop being converted like this - think it was an rcgroups thread but I can't find it for the life of me. Anyone have some thoughts or advice? Hi, The easiest way would be to get hold of an aircraft shaft output APU turbine engine and fit it with a prop, the sort of engine you would be looking for would be a Lucas CR201 or Rotax 2023 off the Harrier jump jet, these produce at the output shaft 90hp at 3000rpm with 400nm of torque, or you could get a Rolls-Royce/BMW T312 from the Tornado fighter jet, these produce at the output shaft 150hp at 8000rpm, both of these turbine engines use around 1 Litre of fuel per minute at full power. As for the availability of these engine I have a friend who has a stock of these that are for sale. Here is a video of a guy in america who has successfully converted the Rotax 2023 turbine engine to a turboprop and installed it into his ultralight: Enjoy, Richard. I had thought about that, but sources of APUs besides Pratt and Whitney are few and far between in Canada. I'd rather true jet not turboprop. Probably not well reasoned desire but - none of this project actually makes much sense. If I was smart I'd just strap 3 of those jetcat pro 500s on... but that's no particular challenge either. |
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Post by racket on May 4, 2019 19:21:47 GMT -5
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Post by hephaestus on May 4, 2019 20:18:14 GMT -5
Hey John, Yes I've read that thread 3x, pm'd to ask about design goals etc as if he wrote them I missed it repeatedly... If I could come in under 80lbs wet, 300lbs (1334N) of thrust would be the target. |
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Post by racket on May 4, 2019 22:22:35 GMT -5
Try jetandturbineowners.proboards.com/thread/1108/100-150-hp-turboshaft-thoughtsThe 80 lbs is possible , but the 300 lbs of thrust is going to require a fair bit of mass flow , probably >10 lbs/sec from a fan .............thats not so easy , Monty's engine is going to be the only way to go to keep weight down , a 2 shaft engine with freepower driving the fan will send weight up even though it'd be a "better??" way to go .................its a shame theres not a combined freepower/fan disc available , fan in the centre and hot turbine at the outer edge . Cheers John |
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