jedax
New Member
Joined: September 2013
Posts: 8
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Post by jedax on Sept 29, 2013 2:25:20 GMT -5
Hi Jedax Do you intend to redesign all of the GR180 parts to accommodate the >20% extra flow from the GTX35 comp wheel , the inducer of the GTX35 is much bigger than the GR180 wheel of ~56mm , you'll need a different flametube , NGV and turbine wheel . Cheers John Hi John. Actually I started to redesign most of the part of GR180. Because gtx35 not only have 20% extra flow rate but %20-30 less havier than the original compressor wheel.and Since I will be using larger comp. wheel I am going to buy bigger turbine wheel and NVG which makes the cost much higher (I can not make them by hand and I hate that tolerance thing And I want my turbine to work with maximum efficiency) . And the worst part is I am reading all the documents here and GTBA and the more I get into the subject,the more it becomes scary and the more I respect you guys. But I can not resist When I hear a jet sound so I am going to do it. And john What about my question? Could I express myself or it look still confusing?(because I need to redisign compressor casing as well.) Thank You. Jedax
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Post by racket on Sept 29, 2013 17:19:59 GMT -5
Hi Jedax Redesigning the whole engine is going to be a major problem , thats why guys buy plans , someone else has already done the hard work , ................why don't you source plans for a larger model than the GR180 . Is there a specific reason why you need a larger engine than the GR180 ?? What do you intend using the engine for ?? Constructing an engine of your own design is a lot of work and not something one should undertake as a first build ...............do you have Thomas Kamps book www.trapletshop.com/gb/p/11293/model-jet-engines-3rd-edition-by-thomas-kamps , there is a scaling formula in the book , .......if you don't have the book I'd suggest you purchase it before going any further with your build . Cheers John
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