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Old Jul 18, 2011, 04:29 PM
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scottd9990's Avatar
United States, NC, Charlotte
Joined Jun 2009
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You can also remove fans with dental floss, just slip it in and saw off between the plastic and foam.
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Old Jul 20, 2011, 01:57 AM
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alpea 41's Avatar
United States, CA, Chino
Joined Oct 2007
10,726 Posts
Mark aka Rookie 2008s Flaps on his DHL 737

Here's what we've got done on the flap install.
MVI 1320 (0 min 41 sec)



And here's a view from below
MVI 1321 (0 min 11 sec)
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Old Jul 20, 2011, 11:33 AM
Avoid The Ground!
Flexserve's Avatar
United States, FL, Tampa
Joined Sep 2008
1,058 Posts
Quote:
Originally Posted by alpea 41 View Post
Here's what we've got done on the flap install.
http://www.youtube.com/watch?v=idC-Hk2fwPc


And here's a view from below
http://www.youtube.com/watch?v=CFf9KybH0wI
"up".."down".."up"..LOL Narration was funny! Just thought that was humorous.

Good job btw.. Think you're only the 2nd one with flaps so far.
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Old Jul 20, 2011, 12:38 PM
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United States, CA, Chino
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I prefer humors sound tracks to music. Sometimes making videos of air plane events the audio is a better show than the video.
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Old Jul 22, 2011, 12:11 AM
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Doug W's Avatar
United States, WA, Seattle
Joined Jul 2010
488 Posts
Quote:
Originally Posted by alpea 41 View Post
I prefer humors sound tracks to music. Sometimes making videos of air plane events the audio is a better show than the video.
Getting very close- great progress thus far! Make sure you sand the leading edges of the flaps to an airfoil shape, otherwise you'll actually harm lift with the flat sawn edge you have thus far. This is hugely important. The relative wind from overtop the wing, and underneath, will "see" a blunt wall of your flaps' leading edge, and it will actually cause high drag, and little if any lift (you will aerodynamically stall your flaps because the airflow will separate).

I know that will ruin the upper portion of the wing in looking nice and uniform, but it is easily solved by placing thin plywood (as in business card thick) over the gap and covering or painting. In real life, those "business cards" are the spoilers, but by just glue them down- it saves you the headache of making the spoilers, and will hugely increase lift.

Note 0:19, the spoilers are covering the leading edge gap I am referring to:

RC 737 Flaps and Spoilers (Windrider) (0 min 40 sec)
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Old Jul 22, 2011, 12:34 AM
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alpea 41's Avatar
United States, CA, Chino
Joined Oct 2007
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Thanks for the info on that . We are gonna cover the top gap with thin ply. If the leading edge adds drag we'll have flaps and spoilers combined.
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Old Jul 22, 2011, 04:57 PM
flying techy
NY
Joined Nov 2005
365 Posts
Quote:
Originally Posted by Doug W View Post
Getting very close- great progress thus far! Make sure you sand the leading edges of the flaps to an airfoil shape, otherwise you'll actually harm lift with the flat sawn edge you have thus far. This is hugely important. The relative wind from overtop the wing, and underneath, will "see" a blunt wall of your flaps' leading edge, and it will actually cause high drag, and little if any lift (you will aerodynamically stall your flaps because the airflow will separate).

I know that will ruin the upper portion of the wing in looking nice and uniform, but it is easily solved by placing thin plywood (as in business card thick) over the gap and covering or painting. In real life, those "business cards" are the spoilers, but by just glue them down- it saves you the headache of making the spoilers, and will hugely increase lift.

Note 0:19, the spoilers are covering the leading edge gap I am referring to:

http://www.youtube.com/watch?v=vJqColJii2o
sweet setup. How many servos? or is it a hinge setup all linked?
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Old Jul 24, 2011, 12:38 AM
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United States, WA, Seattle
Joined Jul 2010
488 Posts
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Originally Posted by New York Flyer View Post
sweet setup. How many servos? or is it a hinge setup all linked?
I have a total of 8 servos actuating flaps and spoilers. Each flap has its own servo, and is on a 6-sec delay, and each spoiler section-inboard and outboard- has a servo. I put together a 3-part overview/tutorial on YouTube if you'd like more detailed info on my set up.
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Old Jul 24, 2011, 01:23 AM
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Southern California
Joined Mar 2010
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Doug You say that I must sand the leading edges of the flaps into a airfoil shape right? Just the top part?
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Old Jul 24, 2011, 11:09 PM
Don't Move I've Dropped My Nut
bamaguy's Avatar
United States, AL, Huntsville
Joined Feb 2009
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Doug;
If I remember correctly, you are also using E-Flite Delta 5's and the 3600KV motors? What kind of amp and watt measurements did you get?

I recorded 59amps/840 watts with my dlux ESC set to "Auto" timing. Reset it to "Medium" and results were 51amps/738 watts. Think I'll go with that to keep heat down..neither the motor or ESC got above 145 degrees. The test battery was a 4S/3300/30C E-Flite from my Habu, (RIP)! I'll be using a pair of 4S4000/40C Turnigy's in the 737.

Getting close to maiden....still working on the wings. Added CF tube from engine pylon to mid aileron and am now running wire/LED's for nav lites, etc. before painting the bottom and vinyl of the top.

Finally found a paint that will bond really well to that darn EPO surface. Had an old can of Ultracote Epoxy spray. Only had yellow and white. So, I'll over coat the white with some Krylon light gray (10 minute no drip stuff) on the wing bottom.
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Old Jul 24, 2011, 11:40 PM
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Southern California
Joined Mar 2010
912 Posts
Gary, I think Doug and I are using HET not the E-flite Delta's.
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Old Jul 24, 2011, 11:53 PM
Don't Move I've Dropped My Nut
bamaguy's Avatar
United States, AL, Huntsville
Joined Feb 2009
1,857 Posts
Quote:
Originally Posted by Rookie2008 View Post
Gary, I think Doug and I are using HET not the E-flite Delta's.
You're right! It is Scott, in NC with the Delta V's....

Anyway, what does your seup draw/produce? You using 3 or 4 cells?
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Old Jul 24, 2011, 11:56 PM
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United States, NC, Charlotte
Joined Jun 2009
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I am using Delta V-15's, 3600kv motors. My Watt meter is on the blink so can't measure for you Bama. Been way to hot to fly lately. Upper 90's here all last week. Not much better this coming week. I am on hold until this heat breaks some.

Scott
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Old Jul 25, 2011, 12:10 AM
Don't Move I've Dropped My Nut
bamaguy's Avatar
United States, AL, Huntsville
Joined Feb 2009
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I hear ya on the heat! Too hot here, too. You using 3 or 4 cells?
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Old Jul 25, 2011, 08:20 AM
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United States, NC, Charlotte
Joined Jun 2009
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Bam, I flew my maiden on 3 cells. It actually did quite well, but I was at 70% throttle all the time as mine felt heavy. I have not tried flying slower or find the stall yet. I think 3 cell had plenty of power, but not if you get into a jam and need power to escape!! I will give the 4 cell a try and see the difference next time out.

S
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