35% Scale Electric Foam Extra 300LX!
11-21-2004, 09:32 PM
#152
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RE: 35% Scale Electric Foam Extra 300LX!
I went to the 8s3p to save weight and also get away from a 2 pack series... some may have problems with properly matching 2 seperate packs. The other bennifit is that you can chage the 8s3p with the Astro 109 lipo charger in 1 hour (1C) It is also 1/2 lb lighter than the 10s2p, and longer run time.
runtime... Depending on how you prop it... 22x8-24-12 you will have 4:30 to 7:20 at FULL throttle... so I'm expecting around 15 min of air time with my flying style...
I'm planning on 1-2 flights a day on the big bird... pack cooling and charging should be taken up with pleanty of 40" 3D Foamy flying time! (and I still have some "stinky" airplanes to fly too)
can't let them feel left out.... 
runtime... Depending on how you prop it... 22x8-24-12 you will have 4:30 to 7:20 at FULL throttle... so I'm expecting around 15 min of air time with my flying style...
I'm planning on 1-2 flights a day on the big bird... pack cooling and charging should be taken up with pleanty of 40" 3D Foamy flying time! (and I still have some "stinky" airplanes to fly too)
can't let them feel left out....
11-22-2004, 03:17 PM
#153
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RE: 35% Scale Electric Foam Extra 300LX!
Levi,
The 8s3p means 8 cells in 3 packs? Sounds cool on the power and runtime. What will the Milliamps be on each cell? Like 1500?
How would the larger Hi-Maxx or the big Axi power this?
I know smaller electrics but I don't know a lot about this bigger stuff.
(Yes, I will admit I mostly fly the "stinky" gas planes and helis, so please pardon my ignorance)
The 8s3p means 8 cells in 3 packs? Sounds cool on the power and runtime. What will the Milliamps be on each cell? Like 1500?
How would the larger Hi-Maxx or the big Axi power this?
I know smaller electrics but I don't know a lot about this bigger stuff.
(Yes, I will admit I mostly fly the "stinky" gas planes and helis, so please pardon my ignorance
)
11-22-2004, 03:40 PM
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RE: 35% Scale Electric Foam Extra 300LX!
3D kid,
8s3p means 8 in series and 3 in paralell. 24 cells in total
this will mean that if you have a 3.7v 2000mah cell, you'd have 8 times 3.7 (the series bit) to give you 29.6v (nominal) and then you will have 3 of those 8s (1p) packs wired in paralell to make 1 big pack of 6000mah.
does this make any sence?
Ian
8s3p means 8 in series and 3 in paralell. 24 cells in total
this will mean that if you have a 3.7v 2000mah cell, you'd have 8 times 3.7 (the series bit) to give you 29.6v (nominal) and then you will have 3 of those 8s (1p) packs wired in paralell to make 1 big pack of 6000mah.
does this make any sence?
Ian
11-22-2004, 09:03 PM
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RE: 35% Scale Electric Foam Extra 300LX!
1 single pack as far as "packs" are defined... it's 24 2500mah cells in one package, just wired so that it's like haveing 8 7500mah cells.
I'm not sure on the Himaxx... But the new large AXI looks promising. A little on the heavy side compaired to the Hacker... and specs show 10s pack #'s and I'd really like to keep it at 8s for charging convienience. I think it would work fine though...
I'm not sure on the Himaxx... But the new large AXI looks promising. A little on the heavy side compaired to the Hacker... and specs show 10s pack #'s and I'd really like to keep it at 8s for charging convienience. I think it would work fine though...
11-23-2004, 06:37 AM
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RE: 35% Scale Electric Foam Extra 300LX!
Levi,
I have been looking at the HiMaxx for mine, but, I don't think I can get the thrust that I am looking for.
The big AXI or the Actro sounds more promising. I really like the Hacker motors, but, I'm trying to show some versatility here also.
I like your theory on the packs, I might go with the 8s3p's also, depending on manufacturers recommendations.
I had been asking you for your gearbox size, all I had to do is look up your equipment post to know that you are going with a 6.6/1. I should have looked before asking, oops.
See ya'
Ken
I have been looking at the HiMaxx for mine, but, I don't think I can get the thrust that I am looking for.
The big AXI or the Actro sounds more promising. I really like the Hacker motors, but, I'm trying to show some versatility here also.
I like your theory on the packs, I might go with the 8s3p's also, depending on manufacturers recommendations.
I had been asking you for your gearbox size, all I had to do is look up your equipment post to know that you are going with a 6.6/1. I should have looked before asking, oops.
See ya'
Ken
11-23-2004, 11:04 AM
#158
RE: 35% Scale Electric Foam Extra 300LX!
Levi,
Which controller do you plan on using with the Hacker? Got a part number?
Also, what size Spinner? May have to go carbon fiber to keep the weight down.
Matt
Which controller do you plan on using with the Hacker? Got a part number?
Also, what size Spinner? May have to go carbon fiber to keep the weight down.
Matt
11-23-2004, 01:43 PM
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RE: 35% Scale Electric Foam Extra 300LX!
Levi,
I have a few questions on the setup. In order to run the most weight-efficient setup, I am contemplating using one 8411/8611 rudder servo on pull-pull, and the same on the elevator. My experience when converting Giant Scale to electric is a difficulty in offsetting the reduced engine weight, moving the CG backward. If the wing position is proportionally located on the fuse, the servos will both be located as far up in the fuse as possible. Is there enough space to put the batteries in the engine box somewhere?
Also, How stiff will the ailerons be? I am thinking of using two mini/micro servos on them, or cross thread kevlar across the aileron, using one HT servo per side...
Weight math
Quick weight guestimation, without double checking the scale:
The Actro power system weighs in at above 60 ounces (motor - 20ozs. , 9S2P2600 34 ozs. ) with ESC, UBEC, etc. producing somewhere north of 2,000 watts on request. Adding four digital servos at 3 ounces each with wires, receiver, switches, hardware for another 28 ounces. I believe that total weight of the equipment will be around 90 ounces. If the airframe is coming in at 6-8 pounds, the total weight will be in the neighborhood of 12-14 pounds....which is easily controlled and powered by the above listed equipment. If the weight comes in at 16 pounds, the power system will be marginal, but still working....
Forward thinking
I think this feels realistic and very positive. To take this one step further, and use some iterative math...
1. You mentioned the fuse weight at 6.5 ozs. If the airframe is a pound or two lighter than my guess above, the total weight will be 10-12 pounds
2. 2000 watts or 160-200 watts pounds is then an overkill
3. Downsize the power system to 1500 watts, which means carry 25% less Li-Polys or reduce 6-8 ounces of battery weight. The motor can be an AXI at 18 ounces, for another 2 ounces savings.
4. Take this 8-10 ounces saving to the bottom line and realize a 9.5 - 11.5 pounds for a 35% frame....
Very exciting! to see where this is going...
I have a few questions on the setup. In order to run the most weight-efficient setup, I am contemplating using one 8411/8611 rudder servo on pull-pull, and the same on the elevator. My experience when converting Giant Scale to electric is a difficulty in offsetting the reduced engine weight, moving the CG backward. If the wing position is proportionally located on the fuse, the servos will both be located as far up in the fuse as possible. Is there enough space to put the batteries in the engine box somewhere?
Also, How stiff will the ailerons be? I am thinking of using two mini/micro servos on them, or cross thread kevlar across the aileron, using one HT servo per side...
Weight math
Quick weight guestimation, without double checking the scale:
The Actro power system weighs in at above 60 ounces (motor - 20ozs. , 9S2P2600 34 ozs. ) with ESC, UBEC, etc. producing somewhere north of 2,000 watts on request. Adding four digital servos at 3 ounces each with wires, receiver, switches, hardware for another 28 ounces. I believe that total weight of the equipment will be around 90 ounces. If the airframe is coming in at 6-8 pounds, the total weight will be in the neighborhood of 12-14 pounds....which is easily controlled and powered by the above listed equipment. If the weight comes in at 16 pounds, the power system will be marginal, but still working....
Forward thinking
I think this feels realistic and very positive. To take this one step further, and use some iterative math...
1. You mentioned the fuse weight at 6.5 ozs. If the airframe is a pound or two lighter than my guess above, the total weight will be 10-12 pounds
2. 2000 watts or 160-200 watts pounds is then an overkill
3. Downsize the power system to 1500 watts, which means carry 25% less Li-Polys or reduce 6-8 ounces of battery weight. The motor can be an AXI at 18 ounces, for another 2 ounces savings.
4. Take this 8-10 ounces saving to the bottom line and realize a 9.5 - 11.5 pounds for a 35% frame....
Very exciting! to see where this is going...
11-23-2004, 02:06 PM
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RE: 35% Scale Electric Foam Extra 300LX!
Your thoughts are parrallel to mine on weight (the second thinking section) I am useing the BMS mini BB servos all around. They are light, and do 56 oz of torque. 1 per elevator (convienient, since they are removable)
2 on each aileron, 2 for the rudder (pull-pull style)
This airframe is much lighter (more than half) and also much slower than a gas 35% airframe... so servo torque will only need to be aprox 1/2 of a heavier airframe... The battery area is in the motorbox, so I'm not too worried about getting the balance. The aft fuse is very light...
Matt>>> I'm planning on the Pheonix 80 (139.95 @ www.newcreations-rc.com)... Full thr. on the setup I've chosen will pull 88amps, and the pheonix can do 120 bursts... Full throttle will be a rocketship though....
Battery = 8s3p (7500 mah)
Gear Ratio = 6,70
Prop = 24,0x10
Batt Amps = 88,8
Motor Volts = 24,3
Input (W) = 2155,9
Motor RPM = 32256
Prop RPM = 4814
Thrust (oz) = 396,1 (24.75 pounds!)
PSpd (mph) = 45,6
Time (m:s) = 5:04 WOT
2 on each aileron, 2 for the rudder (pull-pull style)
This airframe is much lighter (more than half) and also much slower than a gas 35% airframe... so servo torque will only need to be aprox 1/2 of a heavier airframe... The battery area is in the motorbox, so I'm not too worried about getting the balance. The aft fuse is very light...
Matt>>> I'm planning on the Pheonix 80 (139.95 @ www.newcreations-rc.com)... Full thr. on the setup I've chosen will pull 88amps, and the pheonix can do 120 bursts... Full throttle will be a rocketship though....
Battery = 8s3p (7500 mah)
Gear Ratio = 6,70
Prop = 24,0x10
Batt Amps = 88,8
Motor Volts = 24,3
Input (W) = 2155,9
Motor RPM = 32256
Prop RPM = 4814
Thrust (oz) = 396,1 (24.75 pounds!)
PSpd (mph) = 45,6
Time (m:s) = 5:04 WOT
11-25-2004, 09:32 AM
#163
RE: 35% Scale Electric Foam Extra 300LX!
Levi,
Just a word of caution. Many of us that fly pattern with the TP6000 5s3p packs have burned up the Hacker 77 and Pheonix 80 ESC's when pulling over the rated amps. The Hacker 90 ESC seems to be free of failires. You may want to do a search in the pattern flying forum for more details and amps drawn. Tony F has the best info in his thread of electrified partner.
Steve
Just a word of caution. Many of us that fly pattern with the TP6000 5s3p packs have burned up the Hacker 77 and Pheonix 80 ESC's when pulling over the rated amps. The Hacker 90 ESC seems to be free of failires. You may want to do a search in the pattern flying forum for more details and amps drawn. Tony F has the best info in his thread of electrified partner.
Steve
12-01-2004, 08:55 PM
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RE: 35% Scale Electric Foam Extra 300LX!
Holy smokes... can't wait to see video of this bird in the air! Wish I had the time to build one to help during the design phase. That construction is sweeeeeeet!
12-01-2004, 09:03 PM
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RE: 35% Scale Electric Foam Extra 300LX!
hay i want in if there is still room i already got the hacker was going to put in a katana but this looks better !!!!!!!!!!!!
ya way better 35% and only 10 pounds wow ya i want one
e mail me if there is still room my mail is [email protected]
ya way better 35% and only 10 pounds wow ya i want one
e mail me if there is still room my mail is [email protected]
12-02-2004, 12:26 AM
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RE: 35% Scale Electric Foam Extra 300LX!
12-02-2004, 11:11 PM
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RE: 35% Scale Electric Foam Extra 300LX!
hey i was wondering if i could get one, how much are they ihave the axi batteries and the servos already. just need the kit, please let me know how much it is and if i can get one.
12-06-2004, 06:33 PM
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RE: 35% Scale Electric Foam Extra 300LX!
Levi,
I just ordered the Hacker C-50/12XL with the Hacker 90 ESC.
I'm checking on the Thunder Power packs and Duralite, so far.
Ken
I just ordered the Hacker C-50/12XL with the Hacker 90 ESC.
I'm checking on the Thunder Power packs and Duralite, so far.
Ken
12-06-2004, 09:36 PM
#173
RE: 35% Scale Electric Foam Extra 300LX!
Huh? More Brittle? No.. STIFFER and STRONGER.. assuming the same (Adequate) resin (Epoxy we hope!!)
ORIGINAL: Baron Johnson
Levi,
Why CF cowl and wheelpants? That seems like it would be way more brittle than traditional fiberglass parts (although lacking in the coolness department, I know, I know...)
Baron
Levi,
Why CF cowl and wheelpants? That seems like it would be way more brittle than traditional fiberglass parts (although lacking in the coolness department, I know, I know...)
Baron
