Windrider's Boeing 737 - Page 260 - RC Groups
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Jun 22, 2012, 01:11 AM
Registered User
Doug W's Avatar
Quote:
Originally Posted by Pannoch RC
Dry fit and operation of the spoiler system designed by Doug.

Having a break from the wings so started the next section - The Spyro nose wheel door mod. Its works very well.

Thanks to all the input This thread is so full of useful tips and information.

Paul

http://www.youtube.com/watch?v=muHqXnyxutY
I am confident you have the first RC 737 in the southern hemisphere with operational spoilers (that's really quite the pick up line...well, it works in the northern hemisphere).

Nice job Paul- Keep up the great work!
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Jun 22, 2012, 03:47 AM
Caravan driver
wingnutzster's Avatar
Quote:
Originally Posted by Doug W
-700s actually do not sit level- they have a very slight nose down attitude when all three are sitting on the ramp. I recess my nosegear as well simply for scale looks.
Indeed, the low nose at rest is a characteristic of all 737's right from the prototype through to the latest nexgen 900, makes for a real menacing look when she accelerates on her take off role but takes a little getting used to in my opinion when at rest.
For all you 737 and scale nuts, check http://www.b737.org.uk/index.htm

Jun 22, 2012, 04:20 AM
Paul B
Thanks Doug and Derek and congrats on your maiden btw!

Again I have to confess I have copied more great ideas from this thread. I have recessed the nosewheel slightly and raked it forward slightly to enable it to fully sit within the nose wheel well, similar to Doug and Spyro. This allows the nose gear doors to close properly.

Secondly, this also gives the model a slightly nose down attitude which replicates the full scale stance. It is only slight and shouldn't affect takeoff too much...... Hopefully anyway.

Thanks for the tip on the spar for the nosewheel too.

Paul.

I had better head off, I'm off to the clubs to try the new pick-up line
Last edited by Pannoch RC; Jun 22, 2012 at 05:15 AM.
Jun 22, 2012, 11:45 AM
Registered User

Fowler flaps


Still needs a little bit more work but they'll function in the air. Spoilers are already mocked up and ready to deploy...while im at it i could buy linear servos to make leading edge slats :P

RC 737 fowler flap test (0 min 15 sec)
Last edited by hi2nr; Jun 22, 2012 at 12:01 PM.
Jun 22, 2012, 12:57 PM
Registered User
Doug W's Avatar
Quote:
Originally Posted by hi2nr
Still needs a little bit more work but they'll function in the air. Spoilers are already mocked up and ready to deploy...while im at it i could buy linear servos to make leading edge slats :P

http://www.youtube.com/watch?v=aH1CngJ4wlc
Impressive- underside view? Are you using two servos for actuation?
Jun 22, 2012, 01:02 PM
Don't Move I've Dropped My Nut
bamaguy's Avatar
Quote:
Originally Posted by Pannoch RC
Secondly, this also gives the model a slightly nose down attitude which replicates the full scale stance. It is only slight and shouldn't affect takeoff too much...... Hopefully anyway.
It does lower the AOA and contributes to a long take off roll and the likelihood of a climb that is a bit steeper than desired when you give the "up" elevator to break it loose off the tarmac! Makes it a bit easier to stall on take off. Just have to be prepared for it.
Jun 22, 2012, 01:50 PM
Registered User
Quote:
Originally Posted by Doug W
Impressive- underside view? Are you using two servos for actuation?
Windrider 737 fowler flaps bottom (0 min 25 sec)


Fowler flap top view windrider 737 (0 min 41 sec)


The bigger flaps have 2 servos. One on each pylon, the smaller one has 1 servo
Jun 22, 2012, 05:05 PM
Registered User
jakob k's Avatar
Well I just have to share this with you guys.

I have now earned the title Bc.Sc. Mech. Eng with a double major in Innovation and product design, and in Intelligent mechanisms/mechanics...

To think that I have done this at the ripe age of 30 years old with 2 kids and a wife and then on top of that, then this incredible hobby which also takes up a lot of time, then I keep wondering about how on earth I managed to get this degree.

On top of all this, then I ended up with 4 job offers before I even had gone to examination of my bachelors project(Thesis):-)

I am now employed in a company that will send me to Ming-land in the near future if I want to.

-Jakob K
Jun 22, 2012, 08:11 PM
Registered User
Doug W's Avatar
Quote:
Originally Posted by hi2nr
http://www.youtube.com/watch?v=gD1PrBu8o6o

http://www.youtube.com/watch?v=ll7pgD5q-G8

The bigger flaps have 2 servos. One on each pylon, the smaller one has 1 servo
Ok, you've got me stumped...can you take the canoes off so I can see what is going on inside? And where the heck are your three servos that are operating the flaps??

And, it would appear you have spring loaded the canoes to move freely during actuation but return to flush when flaps retracted. I am VERY impressed.
Jun 22, 2012, 08:21 PM
Registered User
Quote:
Originally Posted by Doug W
Ok, you've got me stumped...can you take the canoes off so I can see what is going on inside? And where the heck are your three servos that are operating the flaps??

And, it would appear you have spring loaded the canoes to move freely during actuation but return to flush when flaps retracted. I am VERY impressed.
The servos recess inside the wings which is hidden by the foam, the hinge system is taking your concept and offsetting to fit another set inside also for the 2nd flap to pivot in the fowler motion.

I still need to add a carbon tube or metal tube with a metal wire to keep the center flaps from folding back up under deflection in order to make this functional.

I'll post pictures of the right wing once I get started so you can see the insides but here's a video of how the hinge pivot. ( I was impressed with how it looked)
Fowler hinge RC (0 min 21 sec)
Last edited by hi2nr; Jun 22, 2012 at 08:26 PM.
Jun 22, 2012, 10:44 PM
Paul B
Very impressive hin2r!

I put the plane together to see how much "nose down" it will have after modding the nose wheel well. It turns out there is hardly any.
Jun 23, 2012, 03:08 AM
An unexpected error occurred
Phaedra's Avatar
Won't the canoes of the inboard flaps touch ground at full flaps ?
Very impressive indeed !
Jun 23, 2012, 09:41 AM
Registered User
Nice job on those fowler flaps.
Glad I haven't started on mine yet as I'm now looking forward to seeing
how you did yours.
Jun 23, 2012, 09:54 AM
Registered User
Quote:
Originally Posted by Phaedra
Won't the canoes of the inboard flaps touch ground at full flaps ?
Very impressive indeed !
It doesn't, it only looks that way but they don't extend any further than the engine cowling
Jun 23, 2012, 04:57 PM
Registered User
Doug W's Avatar
Quote:
Originally Posted by hi2nr
The servos recess inside the wings which is hidden by the foam, the hinge system is taking your concept and offsetting to fit another set inside also for the 2nd flap to pivot in the fowler motion.

I still need to add a carbon tube or metal tube with a metal wire to keep the center flaps from folding back up under deflection in order to make this functional.

I'll post pictures of the right wing once I get started so you can see the insides but here's a video of how the hinge pivot. ( I was impressed with how it looked)
http://www.youtube.com/watch?v=a5nYyDUR0R0
I had a feeling you might have just added another Dubro razor control horn set to do that- very nice improvement to the concept.


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