How to choose the right engine for your application
 

I've just finished an article on my blog on how to choose the right jet engine for your model.

http://www.ultimate-jets.net/blogs/j...ur-application

I hope that this will be helpful for some of you and will erase some preconceived idea on engine pricing.

All comments welcome.

RE: How to choose the right engine for your application
 

This is some good stuff here Oli and thanks for all this work.

RE: How to choose the right engine for your application
 

You're welcome. I am going to expand the database with more brands. Also I realized tat the engines having their valves and/or ECU included are being disadvantaged with this method. What I am going to do is substract the weight of the ECU and valve for these engines. 60 grs for ECU, 10 grs for 1 valve. I will come up with a modified table for the following engines: All Kingtech G series, Jetcat Rxi, Merlin engines.

RE: How to choose the right engine for your application
 

great service.

and i still think im right when i think jetcat should rule out alot of their engines, when you dont look at prices. but performance.

RE: How to choose the right engine for your application
 

Thanks Casper.

RE: How to choose the right engine for your application
 

Hey Oli,

Great table! I think it could almost be titled "best bang for your buck" list :)

I find it interesting that the "cheaper" engines have floated to the top of most of the lists when you apply a linear relationship between outright performance and price.

Quick question, Why isn't there isn't the K80 on your table?

Do you suspect that the list might move around a little if the thrust figures used were not manufactures spec's but actual ISA adjusted thrust measurements? Because I do remember that the is some variance between the published figures versus what the turbine could actually produce.

Thanks

Dave

P.s. Item 4, is puce a new engine performance parameter that i've never heard of?:D

RE: How to choose the right engine for your application
 

Oli,
Can you hang around here more? I miss your expertise! A very valuable contributor!
Scott

RE: How to choose the right engine for your application
 

Hi Scott. I have been super busy with my main job ( B777 instructor ) and to setup the Ultimate-Jets web site and blog correctly.
Now that the web site is sort of cruising, I am getting more free time for technical posts.
My aim is to get all my knowledge base available for the community on my blog. This will take some time obviously.
Coming with some more goodies soon...
And thanks for the kind words.

RE: How to choose the right engine for your application
 

Hi Dave.
Thanks for your time reading the blog and your valuable input. I can only improve it with people reading it with a critical eye and giving me this kind of feedback.
I have added the K80G in the table ( simply forgot it somehow ) and corrected the typo.

I don't think that the list would move much with actual test data ( and I have a first hand experience on that matter as you probably know it ).
As you certainly know, all serious manufacturers test their engines before shipping and record the thrust corrected to ISA in a data base.
Some manufacturer chose to ship your engine with a comprehensive set of tables from this test ( Bf-Turbines, Behotec ). Some other keep it unpublished ( most of the others in fact).
The thrust put on their web site usually corresponds to the recorded thrust on the top of their range.
So all in all, there would be some fluctuations within a few% but it would not change the overall table.

RE: How to choose the right engine for your application
 

The new table is on the blog with the K-80G added and all engines including valves/ ECU/ pump corrected by a factor in bracket.
I have deducted 10 grs per valve and 60 grs for ECU and fuel pump.

Enjoy.
http://www.ultimate-jets.net/blogs/j...ur-application

RE: How to choose the right engine for your application
 

Actually, you're absolutely right Dave. This list ranks engines by best value for money.
In that case value includes thrust AND weight, which is extremely important for us.

RE: How to choose the right engine for your application
 

+1 !

Some good information on UAT's and fueling on your page. Look forward to more articles, always well put together. Thanks!
http://www.ultimate-jets.net/blogs/f...considerations

RE: How to choose the right engine for your application
 

Thanks for that Heads Up Sean. Added Ultimate Jets to my desk top.

RE: How to choose the right engine for your application
 

Oli,

Good stuff as usual!! It will be good to see you back here.


I'm traveling through Dubai on Sat., but unfortunately I will only be there a few hours. I'd love to meet up again if I had more time.

Regards,

RE: How to choose the right engine for your application
 

Call me when you have more time Georges. That would be nice to meet up again.
Cheers.