Official Freewing Vulcan 70mm EDF Jet Thread

[Hangarnc]

Exhaust nozzles on eBay. 128mph stock vs 147mph with nozzle!

[BluesDragon]

Blues as good as the vulcan is id go eflite viper70 for first jet. Its 19 dollars more but if you are using spektrum it comes with stablization rx

Although this is true, and I actually did bounce back and forth between the two, I will most likely put the AR630 or 631 in this anyhow. Same as what I did in my 'Spekdyn' PT-17. They're just what I know..

[kallend]

Exhaust nozzles on eBay. 128mph stock vs 147mph with nozzle!

There's something wrong with your links.

Try this:

https://www.ebay.com/itm/22459770082...0AAOSwQy1hM~tW

(Incidentally, that speed increase would require a 32% increase in thrust, which seems very unlikely to me just from adding a nozzle.)

[kallend]

. . .

[kallend]

Although this is true, and I actually did bounce back and forth between the two, I will most likely put the AR630 or 631 in this anyhow. Same as what I did in my 'Spekdyn' PT-17. They're just what I know..

The AR630 is a good receiver but you would need to be very careful with locating it to avoid shadowing from the battery pack and EDF unit, since it has no external antenna.

[kallend]

Here are some nozzles for the Vulcan.

https://www.thingiverse.com/thing:4949975

[Ron1950]

20 bucks for a nozzle is a bit too much ill wait for wild vortex to start selling them besides there is no way to get 20mph from a nozzle

i do have a question about edf's though hamiltons hangar has a vid of his vulcan off longer grass then my fields weeds.. the grass is just up to the nose gear axel and yet i cant get off the ground unless i use full flaps (book value) and run a loooong way down the field ..can there be that much difference in each plane? the power just isnt there and ive calabrated the esc throttle several times .. the nose down attatude of the plane sure isnt helping... once in the air its pretty fast ..any suggestions?

[kallend]

20 bucks for a nozzle is a bit too much ill wait for wild vortex to start selling them besides there is no way to get 20mph from a nozzle

i do have a question about edf's though hamiltons hangar has a vid of his vulcan off longer grass then my fields weeds.. the grass is just up to the nose gear axel and yet i cant get off the ground unless i use full flaps (book value) and run a loooong way down the field ..can there be that much difference in each plane? the power just isnt there and ive calabrated the esc throttle several times .. the nose down attatude of the plane sure isnt helping... once in the air its pretty fast ..any suggestions?

The nozzles I listed on Thingiverse are just designs that anyone with a 3D printer can fabricate. I don't charge anything for the stuff I design.

[paulrkytek]

20 bucks for a nozzle is a bit too much ill wait for wild vortex to start selling them besides there is no way to get 20mph from a nozzle

i do have a question about edf's though hamiltons hangar has a vid of his vulcan off longer grass then my fields weeds.. the grass is just up to the nose gear axel and yet i cant get off the ground unless i use full flaps (book value) and run a loooong way down the field ..can there be that much difference in each plane? the power just isnt there and ive calabrated the esc throttle several times .. the nose down attatude of the plane sure isnt helping... once in the air its pretty fast ..any suggestions?

Ron you could try lighter 3300mah battery, set 2.5 mins on timer and check cells after flight . shorten back wheels 1/4 inch if possible if the pin will allow, though be careful this does not foul the wheel wells. and lengthen front wheel 1/4 inch to give better angle of attack, again assuming you do not foul the wheel well. You could also try c.g 1/2 " to 3/4"further back than book cg.. You might also check power output with power meter to see if it is pulling max watts for the motor spec eg 1500w, 65amp..Check the fan blades are not slipping on the motor shaft. Full flaps tend to cause more drag than lift, try half flaps for better lift. Use high rate elevator for take off to assist rotation on the back wheels and use a touch of up elevator from the start just to take some pressure off the nose wheel and reduce drag to allow ground speed to build up more quickly before pulling back on the stick when take off speed is reached then go to lower rate elevator after retracting gear. Longish thin dry grass about one and a half inch should be ok ( I watched your video of the landing ) especially if the field is smooth, dry and the ground has been rolled to smooth it out. Wet grass and bumpy sticky subsoil can make quite a difference so pick a dry grass time of day to fly edf., (sorry if I have perhaps stated the obvious). Use a new battery min 35 c to ensure full power on take off and check the battery you used for previous flights for power under load. Hope this helps, good luck with your next flights.

My Freewing Hawk with 70mm in-runner is similar in dimensions, weight and power to the Vulcan and gets off dry grass in a short distance with half flaps at no great speed no problem. I would have thought the vulcan would be ok off your field. https://www.youtube.com/watch?v=BoFlsGmzlY8 Difficult to judge without a take off video, maybe next time you could do one
Paul

[Ron1950]

paul thanks ive tryed everthing u mentioned except watt meter and smaller mains...useing a 3300 kv 6 s roaring top battery all ready...tryed no flap take offs and half flap take offs and full flap take offs ... only gets to flying speed on full flap take offs battery is close to a inch back from wire troff hole in the front of the battery tray ..new inrunner fan comes tuesday for the t1 ill see i f its better.. i have a 2.5 in wheel for the nose and ill see about the mains later.. one thing at a time

[Ron1950]

Paul where do u get 1500w and 65a. Stats?

[paulrkytek]

Paul where do u get 1500w and 65a. Stats?

motor draws 65 to 70 amp 25v on full battery 25x65=1625 watts 22.5v x65 = 1465w motor same as Hawk high performance version so I took lower figure of 1500w.

https://www.aliexpress.com/item/32873840342.html Ali express, scroll down and you will find motor output figures 65 to 70 amp 1500w
Also see pg 9 of the Vulcan instruction manual for motor output specifications where it states 1550watt, 70 amp on the 6s version.

[Ron1950]

Thank you paul figured it out after few min. Show ya how much i have forgoten about primary electronics. Navy sent me to avaition electronics tech school in 1970 i hated it lol

[paulrkytek]

Thank you paul figured it out after few min. Show ya how much i have forgoten about primary electronics. Navy sent me to avaition electronics tech school in 1970 i hated it lol

Well as they are both same motor it will be interesting to see the the max amps and watts reading when you test them. Test with same esc and battery and then with different esc If one reads 1600 watts and the other 1200 watts then problem solved, If both read the same its back to square one !!!!

[Ron1950]

square one is what i am afraid of...btw what timing are these 70mm supposed to be set at?

[paulrkytek]

square one is what i am afraid of...btw what timing are these 70mm supposed to be set at?

I will pass on that one Ron. My fms 70mm in-runner platinum pro motors use Hobbywing 80amp esc with timing set to auto. My Freewing Hawk, Rebel , SU35 and Yak 130 all have FMS platinum Pro motors.. Most in-runners have timing set to low, starting with 6 degrees is a safe bet.. If you end up back to square one you might need to borrow a lawn mower

[Ron1950]

good point !!!!!!!

[Ron1950]

ok tested the freewing T1 with the 2210kv in runner and 100a esc vs the vulcan with same 2210kv in runner and the stock 80a esc the 66a/1409w was done at full throttle and 24.9 volt battery and 80a stock esc the 72a/1565 w was done with a 100a esc both had same edf and a 24.9v battery

[Evan D]

So you are saying?

The Vulcan’s motor has an issue?
The bigger ESC allows the T-1 to make more power?
One has more restrictive flow?

??

[Ron1950]

I dont know evan. Today they both flew well in a 10 to 12 mph wind down the runway. Not fam with what the results should be. Just know the t1 with same edf as vulcan but had a 100a esc had higher watts and amp draw then vulcans 80a esc with same battery reading. Normal? I dont know