Its Coming!!!! Skymaster 1/5 F-16 Arf Plus Pro
#101
My Feedback: (76)
Join Date: Aug 2004
Location: Baton Rouge, LA
Posts: 2,715
Likes: 0
Received 0 Likes
on
0 Posts
hyradulic retracts are more trouble then they are worth, you need to find high pressure line like stiff nylon that can sustain 300-500 psi, and then you need to find a strong enough motor to drive it, a turbine pump WILL NOT CUT IT they run at 40 PSI at best.
#102
My Feedback: (14)
Anton can confirm but I'd assume the hydraulic nose steering is "passive" .. meaning it has no pump, just a master and slave cylinder and you move the master with a servo, the hydraulics are just used to transmit the force to the steerable part of the nose gear. Presumably this is attractive when you don't want to move the entire strut as we usually do with a servo or cables at the top of the strut.
Regarding turbine pumps, I've seen pressure measurements way above 40psi on manufacturer test stands (more like 80-90) with the gear pumps used for turbines. I think if you go look at the excellent tread on hydraulic landing gear you'll see a confirmation of this plus some really nice setups. See: http://www.rcuniverse.com/forum/rc-j...-retracts.html
Dave
Regarding turbine pumps, I've seen pressure measurements way above 40psi on manufacturer test stands (more like 80-90) with the gear pumps used for turbines. I think if you go look at the excellent tread on hydraulic landing gear you'll see a confirmation of this plus some really nice setups. See: http://www.rcuniverse.com/forum/rc-j...-retracts.html
Dave
#103
Join Date: Dec 2003
Location: Oudtshoorn, SOUTH AFRICA
Posts: 643
Likes: 0
Received 0 Likes
on
0 Posts
Hi,
I think there are a bit of confusion here. I think it is possible that some of you have not owned a Skymaster landing gear designed by Likai. First of all, the hydraulic system you are referring too is the system with hydraulic pump. Skymaster have never used this system in any of their jets.
Skymaster have used an air driven oil fluid system - F104, with great success. I own one and have never had a leak or failure. This design was a 1st for RC. The second system we are talking about is the steering. It is closed loop oil system with a piston at top and piston at bottom. Servo move the piston and another piston move the steering pin. Also a first for RC and is used in Skymaster A4 with great success. I own one and would know. The reason we use this system is that there is no space for the servo to keep the system as close to scale as possible. Steering is smooth and a bump on the nose leg will not break a servo gear or link as the oil will take the load. These two designs will be followed by another fist for RC soon to be released....
Regards
I think there are a bit of confusion here. I think it is possible that some of you have not owned a Skymaster landing gear designed by Likai. First of all, the hydraulic system you are referring too is the system with hydraulic pump. Skymaster have never used this system in any of their jets.
Skymaster have used an air driven oil fluid system - F104, with great success. I own one and have never had a leak or failure. This design was a 1st for RC. The second system we are talking about is the steering. It is closed loop oil system with a piston at top and piston at bottom. Servo move the piston and another piston move the steering pin. Also a first for RC and is used in Skymaster A4 with great success. I own one and would know. The reason we use this system is that there is no space for the servo to keep the system as close to scale as possible. Steering is smooth and a bump on the nose leg will not break a servo gear or link as the oil will take the load. These two designs will be followed by another fist for RC soon to be released....
Regards
#107
Can you elaborate on when these have been a problem for you?
#108
Hi,
I think there are a bit of confusion here. I think it is possible that some of you have not owned a Skymaster landing gear designed by Likai. First of all, the hydraulic system you are referring too is the system with hydraulic pump. Skymaster have never used this system in any of their jets.
Skymaster have used an air driven oil fluid system - F104, with great success. I own one and have never had a leak or failure. This design was a 1st for RC. The second system we are talking about is the steering. It is closed loop oil system with a piston at top and piston at bottom. Servo move the piston and another piston move the steering pin. Also a first for RC and is used in Skymaster A4 with great success. I own one and would know. The reason we use this system is that there is no space for the servo to keep the system as close to scale as possible. Steering is smooth and a bump on the nose leg will not break a servo gear or link as the oil will take the load. These two designs will be followed by another fist for RC soon to be released....
Regards
I think there are a bit of confusion here. I think it is possible that some of you have not owned a Skymaster landing gear designed by Likai. First of all, the hydraulic system you are referring too is the system with hydraulic pump. Skymaster have never used this system in any of their jets.
Skymaster have used an air driven oil fluid system - F104, with great success. I own one and have never had a leak or failure. This design was a 1st for RC. The second system we are talking about is the steering. It is closed loop oil system with a piston at top and piston at bottom. Servo move the piston and another piston move the steering pin. Also a first for RC and is used in Skymaster A4 with great success. I own one and would know. The reason we use this system is that there is no space for the servo to keep the system as close to scale as possible. Steering is smooth and a bump on the nose leg will not break a servo gear or link as the oil will take the load. These two designs will be followed by another fist for RC soon to be released....
Regards
#109
My Feedback: (76)
Join Date: Aug 2004
Location: Baton Rouge, LA
Posts: 2,715
Likes: 0
Received 0 Likes
on
0 Posts
the 2 experiments I tried simply required way more pressure than air, also polyureathane tubing would burst. Unless you are dealing with small retracts, we are talking about 20lb plane hydraulics will give you a lot of problems.
You need 300 psi to drive hydraulics properly, then you need to find the correct equipment to handle this pressure. Just not worth it.
You need 300 psi to drive hydraulics properly, then you need to find the correct equipment to handle this pressure. Just not worth it.
#111
My Feedback: (57)
the 2 experiments I tried simply required way more pressure than air, also polyureathane tubing would burst. Unless you are dealing with small retracts, we are talking about 20lb plane hydraulics will give you a lot of problems.
You need 300 psi to drive hydraulics properly, then you need to find the correct equipment to handle this pressure. Just not worth it.
You need 300 psi to drive hydraulics properly, then you need to find the correct equipment to handle this pressure. Just not worth it.
The path forward is all electric gear, period! (even for full scale )
#112
Senior Member
Join Date: Sep 2006
Location: Grande Prairie,
AB, CANADA
Posts: 630
Likes: 0
Received 0 Likes
on
0 Posts
Agree with Disco here. Hydraulics are not meant for small scale tasks. Ask the CARF A-4 and Mig-29 owners. The lines eventually soften and deform, theres always risk of leaks. If at all I would prefere and air system with a good safety switch.
The path forward is all electric gear, period! (even for full scale )
The path forward is all electric gear, period! (even for full scale )
Absolutely agree! No matter what its STILL oil in lines that will weaken over time. Im sorry but no hydraulic system on the planet will stay leak free forever. And with a closed system like a jet...its way too much risk and a PITA if you get a leak. Add in small scale and that risk factor goes up 10x. I dont want oil of any kind running through my jet unless its turbine oil being pushed at way less PSI than something hydraulic.
#117
Hi, we starting test the F-16 1/5 in Taiwan, and we still waiting the scale LG for the F-16 1/5, the scale LG will finish on Sep , i will post more pictures and test flight video here,
#120
the F16 1/5 test flight on begin of this month, we had 6 landing , but no camera man , sorry, I will back Taiwan for test it again on next week, i hope that good weather on next week,
here are some pictures for the speed brake done!
here are some pictures for the speed brake done!
Last edited by pilot tw; 08-25-2014 at 06:58 AM.
#123
Maybe they can fix the stance. Most of the SM F-16 look like their tail is dragging. But I liked the ones I owned. I bet the gear price will drop when folks don't pay it.