dtribby Show full post »
apklug
What esc and battery specs were you using with the 7x4 and Ntm 2200?
Also what was the wing span of your plane (since you commented on torque roll).

Sent from my SGH-I747M using Tapatalk 2
Quote 0 0
apklug
Quote:
Today I took up my mig 29 v2 with the 2200 with 6x4. This motor is begging for the 7x4 or 7x5. This should be drawing 45 amps on the 7x4, under 50 on 7x5. For a larger plane needing more prop wash coverage on the tv vanes and rudders this motor would work really well. Otherwise, the 2700 kv motor on 6x4 would be a better choice on all these parkjets built around the 6x4 prop.

http://www.youtube.com/gstrysky
http://www.frcfoamies.com

Thanks! Did you ever measure the 45 amps or is it an educated guess?
Quote 0 0
dtribby
I'm using a 55A Trust ESC - giant cooling fins on that thing! - and Sky Lipo 2200mah 30C/60C batteries. I've also run it on a Sky 1800mah 30C/60C before as well - no problem. The WS is only about 24", if I remember correctly. I have it at work, so I can get you actual dimensions later. Here's a few pics of it before the maiden and subsequent "seasoning"



Yes, I've known that I'm "different" for some time now...
Quote 1 0
apklug
Nicely finished plane. I am not surprised about the tourque roll since the 7 inch prop is 29 percent of the wing span. I think about 20 percent is the sweet spot.

Sent from my SGH-I747M using Tapatalk 2
Quote 0 0
e3_Scott
Quote:
Yes the goal is to maximize thrust without taking a speed drop. The larger radius pulls more amps and so the motor needs to work a bit harder to achieve the same RPM. If you go too big it will burn out. Spinning the same prop faster will increase your top speed much more than it will improve your thrust. Also, having a wider prop allows more air to pass over the rudders instead of sneaking between them, hence improving your thrust vectoring.

I just got a Toyota Venza and the trunk can hold a 41 inch wingspan plane. If you notice the props are always about 20 percent of that to avoid torque roll so I may be also be building one with an 8 or 9 inch prop that will require a different motor.

Regarding your other question, I have never served in the military. I am a Cardiologist. However, there were a few family members and good friends who are no longer with us that did and I appreciate their contributions... Hence my choice of avatar.

At the moment I am at a leafs game and we are winning 2-0

Sent from my SGH-I747M using Tapatalk 2


Thanks for the response and to your family members and friends for their service.

Also glad to see the Leafs won! Maybe you need to do a jet in tribute to them...my girlfriend is a huge Canucks fan, so I built this jet a while ago, unfortunately I may have jinxed them as they have been playing well since I first flew it...ops:
2013-02-11 15.43.23.jpg 

Cheers,

Scott
Park Jet noise...the "other" sound of freedom😎
#ParkJetnoise #ParkJetpilot
Quote 2 0
HiFlite
Looking to try the NTM 2700kv on 4s. Would an APC 5x5 deliver higher speed than a 6x4 at a lower amperage? I only have a 55a Turnigy Trust ESC, so I wanted to go with a 4s setup that draws under 55a. Thanks
Quote 0 0
F1wanabe
You should be ok on amps but only just. The 4.75x 4.75 pulls 48 amps. What is the weight of your plane? If it's under 32 oz you'd be ok. The speed will be faster but 32 oz about all you'll get out of it. My guess us with a 2200 4s you'll be right there.

http://www.youtube.com/gstrysky
http://www.frcfoamies.com
Quote 0 0
HiFlite
Quote:
You should be ok on amps but only just. The 4.75x 4.75 pulls 48 amps. What is the weight of your plane? If it's under 32 oz you'd be ok. The speed will be faster but 32 oz about all you'll get out of it. My guess us with a 2200 4s you'll be right there.

http://www.youtube.com/gstrysky
http://www.frcfoamies.com

The plane (Delta MiG) weighs only 23 oz with a 3s 1800mAh LiPo. Thank you for the help.
Quote 0 0
dtribby
I'm bummed. Test fired my YF-23 yesterday (with the NTM 2200 on a 7x4) and the motor spun up just fine, but today when I got to the field, all the motor wanted to do was sputter. There was practically NO wind, and I think the ESC took a powder. But that thing looks bulletproof, so I guess I have some troubleshooting to do...
Yes, I've known that I'm "different" for some time now...
Quote 0 0
apklug
Geesh I almost ordered one

Sent from my SGH-I747M using Tapatalk 2
Quote 0 0
dtribby
Well, I DID crash it a few weeks ago. I could have messed something up without knowing it. That plane has taken a beating, so I'm not mad, just disappointed at not being able to fly.
Yes, I've known that I'm "different" for some time now...
Quote 0 0
F1wanabe
Quote:
The plane (Delta MiG) weighs only 23 oz with a 3s 1800mAh LiPo. Thank you for the help.

That will do fine on 5x5 4s then. Should be very fast!

http://www.youtube.com/gstrysky
http://www.frcfoamies.com
Quote 1 0