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Hi! Thanks for reaching out! The turboprop module is pretty intricate, so there are lots of places this may have gone wrong. Have you tried running your Can you elaborate a little on the disconnect between GASP & FLOPS engine decks? We currently don't have any FLOPS-based turboshaft engine decks included in any Aviary examples, so I could use some clarification. What specific issues are you seeing? It's hard to tell if your problem is actually related to the turboprop component itself, or a general aircraft sizing problem (such as an engine-airframe mismatch, making it impossible to fly the mission). Speaking of that, the turboprop model used on the freighter example likely won't work as a drop-in replacement for most of the other aircraft examples like advanced single aisle because it is a significantly lower thrust engine. You could try scaling the turboprop up by a factor of about 5 or 6, but I don't think the propeller model will handle that well. |
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Thank you for the response! After I posted this question, I got some clarification from other teammates on the GASP and FLOPS based models so I don't think that is an issue anymore. I had my own misunderstandings that needed to be cleared up so apologies for the lack of clarity there. I have not run the TurboProp component by itself so that could potentially be a good option. I have tried scaling the turboprop model to match the thrust required of something like the advanced single aisle but that has thrown some errors as you had predicted. It is also hard for me to tell if this is an issue with the turboprop component or the aircraft sizing as a whole. Moving forward, would you recommend trying to get a turboprop working within the cargo freighter model or try to get the turboprop component working separately and scale it to the size of the advanced single aisle? Thank you! |
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I would recommend trying to get it working with the cargo freighter model so you don't have to worry about scaling beyond model bounds. I know the freighter model is pretty rough and may have difficulty converging, so apologies if it leads you down some technical rabbit holes! If you can get the turboprop component running happily by itself, but not with the full aircraft model, you could create a custom engine deck by running the turboprop scaled to whatever size you need for your project at a large number of points throughout your expected flight envelope. Ideally you want to be running the turboprop model "in-the-loop" during mission analysis, but if you do this in an external subsystem during pre-mission, you can capture the effects of re-sizing your turboprop during aircraft sizing. Hope this helps, best of luck on your project! |
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FYI I have been working on a set of examples for the turboprop freighter using both the 2DOF and height-energy equations of motion but that has been sidelined for the last couple months. I'm starting to work on that again, it is likely I had some bugfixes in that code that hasn't been able to make it into Aviary yet and that I have since forgotten about... |
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Hi, any updates on the examples? Thanks |
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Hey there, we are currently resolving an issue with our all-electric example unable to work with the 2DOF equations of motion, which did require a refactor of that code. That's currently the largest issue preventing that model from running, so once that code is finalized we will be able to see if the model is finally able to converge |
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Hello!
Background:
I have spent a decent amount of time trying to get the turboprop freighter aircraft working in the Aviary examples. I am working on a design team to build a conceptual model of a Search and Rescue aircraft. As the propulsion lead, I am interested to get the turboshaft engine deck with propeller additions working to use as a turboprop propulsion module. I have been relatively unsuccessful in my attempts to get the turboprop working in multiple different configurations. I have attempted to "retro-fit" the turboprop engines onto existing aircraft models that are running like the advanced single aisle. I have also tried creating an external subsystem that models the propeller with little success. After some digging, it seems to me there is a disconnect between the GASP and FLOPS based engine decks which may be causing some issues. Our team as a whole has had trouble getting GASP based models to work for most applications.
Main questions:
Thank you!
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