Hello All,I bought the wonderful J41 2 days ago and its taken some getting used to after mainly flying the Aerosoft bus and the IFly 737, but it sure is beautiful. What i'd like to know is what are typical cruise levels for this bird? Im doing short hops of max 500miles around east coast Oz so would be great to give me some tips pleaseSimon

Hi Simon,First of all 500 miles is not a short hop for J41 ;) If I remember correctly it was designed for two one hour hops on one fueling or something like that (I read it in some brochure). So for one hour hop the cruise alt would be 16000 feet but for longer ones you will need to take it to 24000 feet to save fuel. Remember that on FL160 at fuel flow of 1000lbs/h you will speed it up to 230KTAS but on FL240 it will go 300KTAS at the same fuel flow.

But why get less IAS in more high altitude? I still don't get understand.....

Hi Simon,First of all 500 miles is not a short hop for J41 ;) If I remember correctly it was designed for two one hour hops on one fueling or something like that (I read it in some brochure). So for one hour hop the cruise alt would be 16000 feet but for longer ones you will need to take it to 24000 feet to save fuel. Remember that on FL160 at fuel flow of 1000lbs/h you will speed it up to 230KTAS but on FL240 it will go 300KTAS at the same fuel flow.

Ah right ok thanks very much indeed, i think im used to 500 miles being a short hop in the A320 and B738 etc haha. I'll give them FL's a go thanks and see how i get on, ive not manged to complete a full flight yet due to work etc, hopefully will get one done tomorrow eve.ThanksSimon

But why get less IAS in more high altitude? I still don't get understand.....

The higher you fly the less dense air is resulting in less IAS but in higher TAS which results in higher GS (of course not in case off strong headwind etc), which simply means that you fly faster ;)

The higher you fly the less dense air is resulting in less IAS but in higher TAS which results in higher GS (of course not in case off strong headwind etc), which simply means that you fly faster ;)

Thanks Grzegorz :)

Interesting topic as I was just going to ask the same thing.The thing is, with 500nm routes, that means you're pretty heavy and I found out that once you reach FL180, climbing higher (i.e. to FL240) is a slow and tedious process...So I have this question: is there some calculation you can make to know to what altitude you can climb easily and safely depending on your takeoff (or current) weight ? Do JS41 flights on longer routes do some sort of step-climbing ? If so, when do you determine it's time to climb higher ?regards from a JS41 newbie.Mathieu

The J41 will climb safely to altitude at any weight, that's the advantage of those big garetts on the sides. It will just take time, and that extra time at climb means that much more fuel goin up as opposed to motoring to your destination...another thing to weigh in your fuel calculations. My general rule of thumb is 100nm - 14000 full load 16000 if a bit light, 200nm - maybe up to 20000 if a light load, 18 if full weight. 300 up to 22000, and anything more right up to service at 240/250 depending on direction.