Turbine weight??
10-12-2005, 11:37 AM
#1
Senior Member
Thread Starter
My Feedback: (31)
Join Date: Oct 2002
Location: Bowling Green ,
KY
Posts: 663
Likes: 0
Received 0 Likes
on
0 Posts
Turbine weight??
I am trying to decide whether to put a p-70 or a p-60 on my PCM aviator. I know i can throttle back or turn down the p-70 so the plane will be safe but i am concerned about the wieght..
The avi8tor is designed for a Ram/T-500 . On their site "moddelbau" they show a wieght of 2.4 lbs... IS that the t-500 engine only with starter?? Because if it is the Jet Cat P-70 shows a weight of 2.6lbs W/starter not much more at all!!!
If this is the case i may go with the p-70 because i really dont think i want a p-60 as the p-70 will probably be more usefull in the future..... Thanks Russ
The avi8tor is designed for a Ram/T-500 . On their site "moddelbau" they show a wieght of 2.4 lbs... IS that the t-500 engine only with starter?? Because if it is the Jet Cat P-70 shows a weight of 2.6lbs W/starter not much more at all!!!
If this is the case i may go with the p-70 because i really dont think i want a p-60 as the p-70 will probably be more usefull in the future..... Thanks Russ
10-12-2005, 11:43 AM
#2
RE: Turbine weight??
I don't know the wight of P-60/70 or ram500, but i know that you have to keep the back of the AV8R light!!!
Mine is equipped with a Ram500 and need lead and big batteries on the front to get the CG right
Mine is equipped with a Ram500 and need lead and big batteries on the front to get the CG right
10-12-2005, 01:37 PM
#3
Senior Member
Thread Starter
My Feedback: (31)
Join Date: Oct 2002
Location: Bowling Green ,
KY
Posts: 663
Likes: 0
Received 0 Likes
on
0 Posts
RE: Turbine weight??
Thats what i am concerned about, of course the P-60 weighs less of all, but the 70 does not have to turn those 165,000 rpms to get power... If the web sites are correct the 70 only wieghs .2 tenths of a pound more than the ram 500... That IS if the 500 wieght of 2.4 is engine and starter ONLY... Russ
10-12-2005, 01:48 PM
#4
My Feedback: (1)
Join Date: Jun 2002
Location: Putnam Valley,
NY
Posts: 1,104
Likes: 0
Received 0 Likes
on
0 Posts
RE: Turbine weight??
Dont be concerened too much, Had one with a P-70 and it was able to balance with out much fuss. Make sure you slide the motor as far foward as you can if you are using the P-70. Big batteries and mounting the acc. as far foward as possible will make it easier.
ORIGINAL: Tar Baby
Thats what i am concerned about, of course the P-60 weighs less of all, but the 70 does not have to turn those 165,000 rpms to get power... If the web sites are correct the 70 only wieghs .2 tenths of a pound more than the ram 500... That IS if the 500 wieght of 2.4 is engine and starter ONLY... Russ
Thats what i am concerned about, of course the P-60 weighs less of all, but the 70 does not have to turn those 165,000 rpms to get power... If the web sites are correct the 70 only wieghs .2 tenths of a pound more than the ram 500... That IS if the 500 wieght of 2.4 is engine and starter ONLY... Russ
10-12-2005, 02:07 PM
#5
My Feedback: (28)
Join Date: Apr 2003
Location: Heath,
TX
Posts: 3,886
Likes: 0
Received 0 Likes
on
0 Posts
RE: Turbine weight??
I have flown one on a P-60 and one on a T-500, they are way more than enough power. The problem you will have with the P-70 is residual thrust. The plane does not want to land as it is on a 12lbs motor.
10-12-2005, 02:34 PM
#7
Senior Member
Thread Starter
My Feedback: (31)
Join Date: Oct 2002
Location: Bowling Green ,
KY
Posts: 663
Likes: 0
Received 0 Likes
on
0 Posts
RE: Turbine weight??
Jet Cats web site says for the P-70 the thrust at 38,000 is .75 It idles at 35,000 so i would guestimate .70 I cant find a reading for the T-500 OR the P-60 at idle.. Russ
10-12-2005, 02:48 PM
#8
My Feedback: (8)
RE: Turbine weight??
The P-70 has an idle set for 38,000 rpm not 35,000. The P-80 is the one in the lineup that idles at 35,000. The residual thrust of the P-70 at idle is about .75 pounds.
The P-60 is almost a pound lighter between it and the P-70. The idle residual thrust is less than .4 pounds. It can produe an honest 14 pounds of thrust all day long with no issues. People get nervous at the 165,000 rpm figure, but believe me it doesn't matter. There is a very small rotating mass and the engine doesn't even feel it much. The longevity will last you far beyond what you would expect. I know of a number of P-60's out there with over 250 flights on them with no bearing or chamber issues.
I personally would go with the P-60 to save on the overall wieght of the motor and fuel. Throttle response is quicker on the P-60 compared to the P-70 as well. Just food for thought.
The P-60 is almost a pound lighter between it and the P-70. The idle residual thrust is less than .4 pounds. It can produe an honest 14 pounds of thrust all day long with no issues. People get nervous at the 165,000 rpm figure, but believe me it doesn't matter. There is a very small rotating mass and the engine doesn't even feel it much. The longevity will last you far beyond what you would expect. I know of a number of P-60's out there with over 250 flights on them with no bearing or chamber issues.
I personally would go with the P-60 to save on the overall wieght of the motor and fuel. Throttle response is quicker on the P-60 compared to the P-70 as well. Just food for thought.
10-12-2005, 05:02 PM
#9
My Feedback: (28)
Join Date: Apr 2003
Location: Heath,
TX
Posts: 3,886
Likes: 0
Received 0 Likes
on
0 Posts
RE: Turbine weight??
Also if you think about it.
The P-60 at 14lbs plus almost a pound lighter than a P-70, doing the math, your getting just about equal push, but lighter airframe with the 60
The P-60 at 14lbs plus almost a pound lighter than a P-70, doing the math, your getting just about equal push, but lighter airframe with the 60
