Jet Central Cheeta
01-15-2019, 06:18 PM
#2
01-16-2019, 05:00 AM
#6
Will be supersonic and bulletproof. It does have one problem....it snaps. Its the only jet I never mastered. Had 3. I love the way they fly but break out in a cold sweat at landing. Shouldnt be a problem at Seguin. I think the cg can be farther aft than they tell you and may help prevent that.
01-16-2019, 05:15 PM
#12
My Feedback: (49)
I have a cheetah on my classic Flash that was purchased and installed by Nir. You'll love it. Great power, small and light, spool up time is very quick, and excellent fuel efficiency - I fly for about 8 mins with some reserve fuel left in case of go around.
01-18-2019, 08:16 AM
#13
About the Flash snapping, … My UltraFlash snapped 5 different times on me when making landing approaches, in my first year with it. I learned to stay off the rudder and keep the nose slightly down until a few feet from the ground, then flatten, and then start to raise the nose slightly and then when the mains are on the ground, make sure the nose comes down by itself versus letting off on the Elev. and forcing it down. (I learned this from a very experienced flash pilot who was not having any issues.) Once I got into that routine, I never had another issue with snapping or landing approaches. I do tend to still come in fast as I too am still a bit nerve wracked from the past snaps. I am sure keeping the speed up helps too. But, staying off the rudder helped me the most. After coming in fast, then there is a lot of braking to do. One needs a good brake controller to maintain control, especially with electric brakes. I have tried 4 different E-controllers and currently am about to test the LG15 on the next flight. It seems to be the only one that works well enough to avoid brake dancing.
Cheetahs are great engines. The only thing that I have seen come up with our jet guys that use them is the brushless starter upgrades use a lot of battery. Not sure if the new ones have that solved or not. Have only seen a couple come back from their routine service with the brushless starter upgrade and the owners were really POed cause they could only get two flights off their batteries that used to give them 5 flights before the upgrade. Other than that they seen to be great turbines with lots of power. Very reliable in starts too.
Cheetahs are great engines. The only thing that I have seen come up with our jet guys that use them is the brushless starter upgrades use a lot of battery. Not sure if the new ones have that solved or not. Have only seen a couple come back from their routine service with the brushless starter upgrade and the owners were really POed cause they could only get two flights off their batteries that used to give them 5 flights before the upgrade. Other than that they seen to be great turbines with lots of power. Very reliable in starts too.
01-19-2019, 01:21 AM
#14
This s such an easy fix with ALL turbines. I have always used a "jump" battery to start my engines, just "Y" connect a battery through a switch during the start phase you can then get 6 or 8 flights from one ECU battery charge.
m
m
01-20-2019, 01:53 AM
#17
You have a switch in the circuit so you only start on the jump battery. Then switch over and disconnect the jump battery once the start sequence is complete.
I use a 2000Mah for the flight and a 5000 for the start, that way they both last for weeks. Remember the flight battery is only driving the pump, not the burner and the starter. I also reconnect the jump for the cool down.
m
I use a 2000Mah for the flight and a 5000 for the start, that way they both last for weeks. Remember the flight battery is only driving the pump, not the burner and the starter. I also reconnect the jump for the cool down.
m
01-20-2019, 06:45 AM
#19
About the Flash snapping, … My UltraFlash snapped 5 different times on me when making landing approaches, in my first year with it. I learned to stay off the rudder and keep the nose slightly down until a few feet from the ground, then flatten, and then start to raise the nose slightly and then when the mains are on the ground, make sure the nose comes down by itself versus letting off on the Elev. and forcing it down. (I learned this from a very experienced flash pilot who was not having any issues.) Once I got into that routine, I never had another issue with snapping or landing approaches. I do tend to still come in fast as I too am still a bit nerve wracked from the past snaps. I am sure keeping the speed up helps too. But, staying off the rudder helped me the most. After coming in fast, then there is a lot of braking to do. One needs a good brake controller to maintain control, especially with electric brakes. I have tried 4 different E-controllers and currently am about to test the LG15 on the next flight. It seems to be the only one that works well enough to avoid brake dancing.
Cheetahs are great engines. The only thing that I have seen come up with our jet guys that use them is the brushless starter upgrades use a lot of battery. Not sure if the new ones have that solved or not. Have only seen a couple come back from their routine service with the brushless starter upgrade and the owners were really POed cause they could only get two flights off their batteries that used to give them 5 flights before the upgrade. Other than that they seen to be great turbines with lots of power. Very reliable in starts too.
Cheetahs are great engines. The only thing that I have seen come up with our jet guys that use them is the brushless starter upgrades use a lot of battery. Not sure if the new ones have that solved or not. Have only seen a couple come back from their routine service with the brushless starter upgrade and the owners were really POed cause they could only get two flights off their batteries that used to give them 5 flights before the upgrade. Other than that they seen to be great turbines with lots of power. Very reliable in starts too.
what battery are you using?
01-20-2019, 07:53 AM
#20
The two turbines that came back from routine service with the brushless starter upgrade that had the high power usage issue are NOT mine. I have two different members that experienced this issue last year. I just helped with their starts as their spotter and listened to their comments. I will pass this discussion on to the one that is still flying jets. The other one gave up on jets last year. I do NOT know if this issue had anything thing to do with that decision.
Using switches and jump starts just seems unnecessary to me. Never needed to do it with my 6 turbines. Actually, one of the manufacturer's instructions specify not using a switch in the turbine's power source. IMO, switches are just another potential single point of failure. Most of the switches on the market can't handle the current that is required anyway. I do use PBox soft switches, which also shuts off the ECU. PBox soft switches fail on. All three of my jets only use about 400 - 500 mah on the turbine power source for a start/flight. I normally get at least 3 flights on an OEM's 2100 mah LiFePo4 s. (LiFePo4 chemistry is designed for high current applications, by the way.) But, I have run 4 start/flights on them, when I forgot to swap them out a couple times. For the Sprint, I get 8 starts on the 5700 mah LiPo before the starts get iffy. The Sprint averages about 400 mah per 10-12 minute flight on the turbine power source. For my situation, jump starting is NOT keeping it simple. So, I agree that the issue we are discussing is NOT normal or at least should not be.
Using switches and jump starts just seems unnecessary to me. Never needed to do it with my 6 turbines. Actually, one of the manufacturer's instructions specify not using a switch in the turbine's power source. IMO, switches are just another potential single point of failure. Most of the switches on the market can't handle the current that is required anyway. I do use PBox soft switches, which also shuts off the ECU. PBox soft switches fail on. All three of my jets only use about 400 - 500 mah on the turbine power source for a start/flight. I normally get at least 3 flights on an OEM's 2100 mah LiFePo4 s. (LiFePo4 chemistry is designed for high current applications, by the way.) But, I have run 4 start/flights on them, when I forgot to swap them out a couple times. For the Sprint, I get 8 starts on the 5700 mah LiPo before the starts get iffy. The Sprint averages about 400 mah per 10-12 minute flight on the turbine power source. For my situation, jump starting is NOT keeping it simple. So, I agree that the issue we are discussing is NOT normal or at least should not be.
01-25-2019, 03:37 PM
#25
My Feedback: (9)
That is not normal. Typical consumption with the brushless starter is not different. My cheetahs and Rhinos are in the 450 mah per flight, so I do 6 flights per charge on a 3800mah battery. Talk to Manny about your problem, something weird is going on if you are using over a 1500mahs per flight. Maybea some huge restriction on your fuel system?
what battery are you using?