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Old Dec 26, 2012, 04:09 PM
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Hollywood2979's Avatar
United States, TX, Cibolo
Joined Nov 2011
330 Posts
Yeah I tend to do that with all my plane now, I may just scrape in a dirt packed runway and get away from the grass all together.
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Old Dec 26, 2012, 09:37 PM
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Hawaiian Flyin's Avatar
Maui, Hawaii
Joined Dec 2007
324 Posts
Quote:
Originally Posted by hi2nr View Post
Make sure to need up your LG strut rods and to glue those wooden plates down good. I used to always bend my LG landing on grass
+1 on that. I have only 1 flight on mine and had one plate come unglued and the other 2 bent. Although my landing wasn't what i would call pretty.
Thanks Bama & Jurgen. Already have the shafts ordered.
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Old Dec 26, 2012, 10:24 PM
ich bauen groß modell flugzeug
Keenan smith's Avatar
United Kingdom, London
Joined Dec 2010
6,829 Posts
you guys will like this and a shout out to sergey i hope he doesnt mind that i used some of his video in mine
Stabilised approaches: why do them? (2 min 50 sec)
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Old Dec 27, 2012, 09:08 AM
*** gravity sucks ***
Fotor's Avatar
Netherlands
Joined Mar 2007
400 Posts
In real aviation we use the term 'stabilised approach' not for a certain way of controlling the airplane (control speed with pitch and descent rate with throttle), but for having the airplane stabilised by a certain altitude. Some companies use 500 ft, but more and more companies use 1000 ft. At this altitude you should have a number of parameters within certain limits (on speed, on the correct glide path, aligned with the runway, wings level, flaps and gear configured, throttles not idle, checklist completed), otherwise you have to make a go-around.
Research showed that unstable approaches increase the chance of an accident dramatically.

It's something I try to achieve with most model airplanes, but certainly with the 737. I want to have the correct speed starting the base turn, and on final there should be no need for big corrections of any kind.
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Old Dec 27, 2012, 03:37 PM
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Joined May 2012
31 Posts
"Here is a short fly by vid of my airliner with the 12 blade fans installed, (not a b737) you will lose about 1/3 of your flight time using these fans, I went from a 3300mah 4s battery 5 blade fan and 3200kv motor to a 4500 4s 2300kv motor to achieve the same flight time, 4-5 minutes depending on wind"

Hi Mike,
Thanks for your advice. What ESC are you using? I dont have to much of a clue ref the electrics, and want to get get the best set up for the fans. You sound like you have done a fair amount of testing. Any specific motor and ESC brand you recommend?

Thanks
Gav
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Old Dec 28, 2012, 05:15 AM
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limodune's Avatar
Australia, QLD, Toowoomba
Joined Oct 2011
373 Posts
Gav
The motors I have been testing only draw about 40-50 amps or so (L2836 2300kv 2800kv outrunners and a Tacon 2618kv inrunner) so I use 55amp ESC Turnigy Trust, I used this chart as a guide (from the Change Sun 10 blade fan thread), the numbers I got were a little different, lower, bought this stuff from HK

Mike
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Old Dec 28, 2012, 08:16 AM
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Joined May 2012
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Hi Mike,
I really appreciate your advice. I am going to order this same set up myself. Im assuming this also helps with lower heating issues?

Also, what did you use to balance your fans, and did you find they where off by much? I haven't balanced fans before, looks straight forward online though to do.

thanks
Gav
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Old Dec 29, 2012, 06:12 PM
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limodune's Avatar
Australia, QLD, Toowoomba
Joined Oct 2011
373 Posts
Just a normal prop balancer, one was fine the other needed balancing, if you are going to use an out runner motor you will need to make a notch on the motor plate to clearance the wires where the motor attaches to, other wise they could hit the fan

Mike
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Old Dec 29, 2012, 08:05 PM
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Joined May 2012
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What specific motor are you currently using? I'm just going to play it safe and get the same set up as you, other wise I'd honestly be guessing the set up.
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Old Dec 30, 2012, 11:44 AM
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United States, CA, Pasadena
Joined Jun 2007
221 Posts
Quote:
Originally Posted by Ming View Post
I think 1 X 3 or 1 X 4mm is good enough.

Ming Lou
Please give me tracking info on my purchase, thank you
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Old Dec 30, 2012, 06:36 PM
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limodune's Avatar
Australia, QLD, Toowoomba
Joined Oct 2011
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Quote:
Originally Posted by Major12 View Post
What specific motor are you currently using? I'm just going to play it safe and get the same set up as you, other wise I'd honestly be guessing the set up.
I am using the 2300 kv motor, your AC is heavier than mine so I would look at the 2800kv motor, but the choice is yours----

Mike
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Old Dec 31, 2012, 03:52 PM
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Thanks for your help Mike!
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Old Dec 31, 2012, 08:19 PM
Ming's Avatar
Hong Kong
Joined Jun 2002
4,575 Posts
We aleays suggest to use Scorpion HKII2221-8(3595kv) motor for 3S or 4S on stock CS70/4 EDF unit.

Ming Lou
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Old Jan 03, 2013, 11:47 AM
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United States, TX, Grand Prairie
Joined Nov 2005
5,682 Posts
Quote:
Originally Posted by limodune View Post
Here is a short fly by vid of my airliner with the 12 blade fans installed, (not a b737) you will lose about 1/3 of your flight time using these fans, I went from a 3300mah 4s battery 5 blade fan and 3200kv motor to a 4500 4s 2300kv motor to achieve the same flight time, 4-5 minutes depending on wind

Mike

http://www.youtube.com/watch?feature...&v=MOxs-VWsmDE
The 12 blade fans have almost same exact total pitch as 10 blade fans....I'm seeing similar thrust\watt numbers
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Old Jan 07, 2013, 04:54 AM
Paul B
Australia, TAS, Launceston
Joined Dec 2009
352 Posts
Its been a while but I finally maidened mine on Saturday. The flight was exciting so say the least. The RHS flap hung slightly lower than the LHS causing a constant roll to the left which was manageable but required concentration.
The current draw was huge, setting off the LVC after only 2 min of flight. This also heated the battery connection to the point where the solder melted. Only the heat shrink kept the cable to the connector which finally separated on landing.
I didn't quite make it back to the strip, landing in a field which only caused minor bending to the landing gear. Otherwise not a scratch.
I've already fixed the retracts and I'm in the process of designing a better wiring system to handle the current flow, and looking for bigger batteries. I used a 14.8V 5000mah Nanotec for the flight which proved to be powerfull enough, just not enough capacity.

Easily takes off from grass with flap and spoiler mod. Inboard cam shows very little wing flex which was put through its paces due to the flap induced roll

Here's the vid

Windrider Boeing 737 Virgin Blue Maiden Flight (5 min 38 sec)


Cheers

Paul
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