What size engine - A poll
 

What size engine would you most prefer to have?

Do you like 'em small or are you a Mega dude? Do you want the whole thing to be blingy or just run-of-the-mill regular.
I've also added an option for the financially challenged (like me :D)


Vote away!

RE: What size engine - A poll
 

You should add the 20 lb & 30 Lb class to your list;)

RE: What size engine - A poll
 

Too many options. Like going into a restaurant and having to spend the next 30 minutes reading the menu :)
I'll add a 33lb option for those who like'm big (but not really).

RE: What size engine - A poll
 

28 to 30 #

RE: What size engine - A poll
 

40lb engine in a 28# case also same weight ;) This type of engine works in any 25lb jets.

RE: What size engine - A poll
 

I like the 40lb thrust class overall, but right now I had to pick mega monster because that's what I'm after!

RE: What size engine - A poll
 

We need a Jet Central Rhino thrust class sized like a Falcon. Kind of like a Rabbit technology based Falcon.

RE: What size engine - A poll
 

You're saying you want more thrust in smaller package, right? Even if the fuel draw is horrible?
Very generally a 40# engine in a 30# case will draw fuel like a 50# engine.

RE: What size engine - A poll
 

PaulD

RE: What size engine - A poll
 

They always say that small ones work fine. Don't let them fool you. They always like the larger ones better.

RE: What size engine - A poll
 

Of course not. Put some compressor technology there man.

RE: What size engine - A poll
 

Well.. A 25lb# engine size in a JL L-39 (Example 40#thrust for a L-39 or a S/M F-18c ) will put your throttle setting above haft the whole flight. But with a bigger engine your throttle just above idle & better fuel consumption.

P.s In my opinion

RE: What size engine - A poll
 

Maybe something like this? http://www.jets-munt.com/pb/M140/M140.html

Gaspar

RE: What size engine - A poll
 

Hehe...
Efficiency doesn't work that way. Consider 2 engines. Both 40# thrust. One has a 120mm dia case and one has 100mm. The larger diameter will have better efficiency. It will use less fuel to push the same thrust.


I can understand why the thrust-to-weight or thrust-to-size numbers produce better sales. But on the efficiency side having a wide and short engine is much better.

RE: What size engine - A poll
 

Good point ;)

RE: What size engine - A poll
 

Actually if you want more thrust.... :eek:

RE: What size engine - A poll
 

Not true as general statements, certainly with the engines I have flown. I have engines in 90mm casings that push out 10kg and are no less fuel efficient than similar thrust engines in 110mm casings. You will find the currently emerging crop of smaller cased/higher thrust engines are just as fuel efficient as their larger cased predecessors.

Better thrust/weight and thrust/size is just evolution, look at how things have progressed in the 110mm class since the KJ66.

You need to add a choice in the poll for those of us who don't have a particular size preference and it does not have to be cheap. :D

Rob.

RE: What size engine - A poll
 

Now thats what im talking about :D

RE: What size engine - A poll
 

I believe that for my budget, cheaper is better, even if that means having to modify the turbine to make more thrust. I Like buying cheap and experimenting, it puts more fun into the hobby.

RE: What size engine - A poll
 

Here's the turbine wheel for the new JetCat....

RE: What size engine - A poll
 

Interesting blade shape. Somebody's spent some time in the test lab.... [8D]

PaulD

RE: What size engine - A poll
 

More taste less filling :)

RE: What size engine - A poll
 

Model Turbine engines have a long way to go before they reach the level of perfomance that can and has already been achieved in 4" diameter sizes. I have seen compression ratios of 6:1 and 300N thrust at FSC of 0.02 g/N/s in KJ sized package, using ceramic NGV and turbine, 600N with 2000 deg EGT.
Mainly the compressors and diffusors are radically different from the current CFD "optimised" designs. Combustors are simple but also very different.
Andre Baird

RE: What size engine - A poll
 

Paul,
The major players are able to invest in R&D effort that is unaffordable by the model engine companies.

That wheel is from a Teledyne Continental 373-8C turbojet (940 Lbs of thrust, using 1980's technology). I was first introduced to this engine in around 1986.

I took the attached launch photo in 2001 at Kom Aushim AFB, (Egyptian Air Force) southwest of Cairo, Egypt.

The booster burns for 4.5 seconds, produces 4550Lbs (nominal) of thrust, when combined with the engine's 940 lbs of thrust, accelerates the UAV from zero airspeed to over 400 Kts at booster burnout and drop-off. The UAV weighs 2356 Lbs. gross.
When the booster ignites, it is Hellfire and Brimstone!!

RE: What size engine - A poll
 

Nice to see some variety here. I was starting to think that the P-200 was the only turbine in existence now. LOL

Eric