Full Pressure Cutlet

[fwsorg]

Full Pressure Cutlet

Ive been there with the whole 1.1kg bottle in a feather. Really not a good idea. Ignoring the weight, the tank itself is bigger than most feathers.

P.S you feather is looking very good chris- keep up the good work- looks to be coming along nicely. And assuming those motors are as powerful as they look, keep them! High speed, powerful flippers are great fun- theres nothing like driving another robot into the wall then flipping it oota Your task as a robot builder is take your weapon to your opponent (not the other way round) so I say keep em- itll be a good challenge. Shout if you need any help.

[team_ireland]

Full Pressure Cutlet

You see the reason I said 1.1kg is because that looks like the size that the one in Chriss pic above or is this a 600g?

Also today i bought a 600g Dry Poweder Extinguisher. It weighs as is (including Dry powder and key etc) 690g. Not bad in my opinion considering a 2 liter coke bottle is 60g.

Thanks for the help mario and stu. I am starting to aggree that it may not be possible as even with my simple demo bot I was expecting weight so far to be about 4-5kg. Its 6kg allready but i have just to add the armour (6mm ply) and the solenoid valve.

What do you guys think would be better. 2x2L of air or a compresser and a 2L buffertank? (can do both)

What you think?

Regards
Ian Mc Donald

[stu]

Full Pressure Cutlet

Pressure Switch - 2L tank, compressior. Dont use a compressior on a bottle of coke plastic crappy thing. Plastic bottles on AVERAGE only go up to about 100psi before things go bang.
Use ur 690g buffer thing with the compressior. - Sorted.

Depends what ur doing. Doe Demo - maybe the 2 x 2L bottles as its quieter. But for battle - the compressior.

Mr Stu
- yes that bottle in Chris picture is a 600g Co2 bottle. Same bottle that Rip, DTk, FlowRate, Cut-Let, G2, Prince of Awe, New PLF, MiniMoth etc all use.

[blazerbotics]

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thats a 600g bottle in chriss photo. G2 can get about 145 flips from a 600g bottle (thats double acting as well).

a 2L bottle with a compressor would be best.

Weight again is the major problem with pneumatics in feathers. the compressor system is probably lighter (just) but not as effective.

Remember Co2 requires the facility to re-charge.

[gravity]

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people say it cant be done / is not advisable ? That does it. Im gonna build a fp feather with a 1.1 kg bottle. So what If I dont have any weight left for armour ? armour sucks anyway, who needs it, only people who fight defensive !

[maddox]

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WJ, it can be done. Thats why Flip in original form had only 1 drivemotor.To save weight on drive and batteries, only 1 speedo etc.Now the feathers may use the 600 gram paintballbottle the choise was made fast.

Project One used A huge 3.5kg bottle.A lot of weight taken up by that could be used better to improve valves and the then unknown buffertank.
So it is still a learning curve,and when a better opportunity arrives, why not?

Ian, let me calculate again.
Your 63mm bore 100mm stroke ram uses 2.3L each action. When using 2 2L cokebottle you have about 3 useable actions, with the last one a feeble lifting of the arm.Starting to push up 124 Kg(41 kg on the front edge of the hypotetical 30 cm liftarm)
I would say, Stus advice sounds very useable.

[team_ireland]

Full Pressure Cutlet

Well the compresser I got has an auto stop once a certin pressure is reached so would this be ok to run without it being tied back to the rx or what would I use to tye it back if it does need to be

Regards
Ian Mc DOnald

[blazerbotics]

Full Pressure Cutlet

we had one from halfords that cut of the pressure, but the system was no good. we just used the pump and bought a pressure switch from RS (same as cutlet had). This meant the pump looked after itself, but we still had a cut-off switch on the TX.

[team_ireland]

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Alan
How did you link it back to the rx. I dont understand how you did this? Servo etc

Regards
Ian Mc DOnald

[Guest]

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Putting a solid-state rc switch in series with the pressure switch would work.

[big_nipper]

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Weve done a similair thing but instead of using a rc switch we used a model aircraft speed controller. It fits directly on the back of the motor & plugs into the rx. It has a failsafe built in so breaking the white wire causes it to stop. I think it cost £20 for the 30A 12V one. The speed controller only works one way but is alot smaller and lighter than most rc switchs.

[team_ireland]

Full Pressure Cutlet

Would a simple servo powering an on/off switch work?
Regards
Ian mc Dona;d

[big_nipper]

Full Pressure Cutlet

Course it would but it will be a bigger system. Can you remember the old mech speed controller for RC cars these would be ideal or you. Just remove that large resistor and only use the last speed (Think they are only 3 speeds)

[team_ireland]

Full Pressure Cutlet

Hi

In my profile I have a pic of my Servo Powered Switch will this be ok in your opinion?

Regards
Ian Mc Donald

[Guest]

Full Pressure Cutlet

Neat! Looks ok, assuming the switch can handle the current drawn by the compressor.