Foamboard Scratchbuild University - Page 104 - RC Groups
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Sep 22, 2012, 03:48 PM
Beginner RC Pilot
achurin's Avatar

Definitely tail heavy


Quote:
Originally Posted by IAFoamie
Hello
Nice plane achurin. I'm trying to decide if plane is tail heavy or it was the wind. Your motor looks light and battery under front of wing. Even with landing gear looks tail heavy to me? Where does it balance"thickest part of wing"?? What is the all up weight also. My wing is same but 56" long on AXON.
She was definitely tail heavy the first day. The second day she flew better and performed better after the extra weight I added with the landing gear. I have a build thread on my blog and I will be updating it shortly. My last outing the motor failed, and I had a bit of launch/crash incident. Putting a much bigger motor on there now. I have a Turningy D3536/6 ths has yet to see any flight time.

I will update the video footage then. It should add a bit of weight and power to it.
Thanks for watching and the suggestions/observations.

As a rookie, I appreciate all the advice I can get!
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Sep 23, 2012, 06:58 AM
Registered User
jetcommander's Avatar
Quote:
Originally Posted by achurin
She was definitely tail heavy the first day. The second day she flew better and performed better after the extra weight I added with the landing gear. I have a build thread on my blog and I will be updating it shortly. My last outing the motor failed, and I had a bit of launch/crash incident. Putting a much bigger motor on there now. I have a Turningy D3536/6 ths has yet to see any flight time.

I will update the video footage then. It should add a bit of weight and power to it.
Thanks for watching and the suggestions/observations.

As a rookie, I appreciate all the advice I can get!
Do you have music on the video that has copyright? Unfortunately it canīt be seen here in Germany, You Tube link perhaps?
Sep 23, 2012, 03:55 PM
Registered User
Wingman26's Avatar
Quote:
Originally Posted by jetcommander
Do you have music on the video that has copyright? Unfortunately it canīt be seen here in Germany, You Tube link perhaps?
Yep, some people might call that music...

I turned the volume all the way down after the first few seconds.
Sep 23, 2012, 05:29 PM
It Flys Me
aldalo's Avatar

Tube Trainer


Just finished my newest plane , using Ed,s methods.
It's a trainer with about 5 degree dihedral wings.
Fuse is 30" long-5" cord , Wing is 39.5" , Elevator - 15" , Rudder -7.5" /
1.5" throws on all control surfaces.
AUW - 525g - 1300 mah battery
Motor 1000kv (Hope it's enough, I had it laying around)
I hope to maiden it tomorrow. I needed something a little tamer than my
Axon (It's a handful)
Sep 23, 2012, 08:15 PM
Fan of experimetalairlines
Quote:
Originally Posted by aldalo
Just finished my newest plane , using Ed,s methods.
It's a trainer with about 5 degree dihedral wings.
Fuse is 30" long-5" cord , Wing is 39.5" , Elevator - 15" , Rudder -7.5" /
1.5" throws on all control surfaces.
AUW - 525g - 1300 mah battery
Motor 1000kv (Hope it's enough, I had it laying around)
I hope to maiden it tomorrow. I needed something a little tamer than my
Axon (It's a handful)
Looks nice! How did you do the undercarriage?
Sep 23, 2012, 09:16 PM
Scratchbuild Aviation
speedactyl's Avatar
HI just abit of question how do you explain to people where best to use

EPO
EPP
Depron
EPS

thanks
Last edited by speedactyl; Sep 24, 2012 at 03:44 AM.
Sep 23, 2012, 09:47 PM
It Flys Me
aldalo's Avatar
Quote:
Originally Posted by rcnewbieoz
Looks nice! How did you do the undercarriage?
I just bent some aluminum rod & epoxied in place ( Don't no if it will hold up)
Sep 23, 2012, 10:48 PM
Closed Account
The CarbonFlite Project Update #2 - Scratchbuild (4 min 24 sec)


Using an Armin wing. Thanks ED!
Sep 24, 2012, 12:03 AM
Registered User
Wingman26's Avatar
adalo: In reference to the trainer above, a longer wingspan would make that more stable and easier to fly, also a longer fuselage would make it less sensitive in the pitch axis. With the short wing its probably going to be too sensitive in the roll axis to consider it a trainer, in addition it could probably use more wing area to lower the wing loading.

CarbonFlite: In the video immediately above, this makes a great demonstration of why its so important to set up your dual rates before the first flight!

Also, you mentioned polyhedral, I think you meant dihedral, in your case adding wingtips with dihedral would probably make the plane more stable, to add polyhedral would probably mean building a complete new wing, putting dihedral in the center of the wing, then adding more dihedral at the wingtips, to fit the proper definition of polyhedral.

You could add wingtips with dihedral to your existing wing to add stability.
Sep 24, 2012, 12:56 AM
Closed Account
Yes, I meant adding wing tips with dihedral. I am going to make a 90" wing and see how that works out. I am looking for slow flying plane with a decent payload capacity. I'll keep you guys updated.
Sep 24, 2012, 12:02 PM
Registered User
Wingman26's Avatar
90 inches! Very good!
Sep 24, 2012, 12:56 PM
Registered User
So you know where I'm coming from, I've got all of my foam and parts in hand and am about to begin my first scratch built aero plane.

I've decided to go the hot wire foam cutter route. Studying here at FSU I've learned that you can probably get a "good enough" ready built cutter for less than $20-.

Would you please post [a] link[s] to [a] decent, cheap ready built cutter[s]?

Also, I've got a 306B which has a minimally documented foam cutter mode. Can you describe or post [a] link[s] to [a] simple, elegant, easy to make cutter[s], made from common scrap, built to be driven by the EPBuddy iCharger foam cutter mode?

Thanks!

Edit: and to answer my own question. There's a good plan here for an RC plane wing cutter requiring two woooden blocks two screw hooks, and a wire.
Last edited by syzygyQ; Sep 24, 2012 at 02:40 PM. Reason: answering my own question
Sep 24, 2012, 02:05 PM
Sabre holic
Gordosoar's Avatar
Quote:
Originally Posted by CarbonFlite
http://www.youtube.com/watch?v=WJiZJeVvATM

Using an Armin wing. Thanks ED!
Very nice build. Can you list the dimensions.

I've been away for a few days and just catching up on things.
Lot of nice planes being built out there.
I'm still flying the same old things but loving it.
If you have Double vision, land the bottom plane.
Sep 24, 2012, 04:36 PM
Registered User
rimshotcopter's Avatar
Quote:
Originally Posted by CarbonFlite
Yes, I meant adding wing tips with dihedral. I am going to make a 90" wing and see how that works out. I am looking for slow flying plane with a decent payload capacity. I'll keep you guys updated.
I am curious, would increasing the cord measure and the thickness also help lower the stall speed of the wing?
Sep 24, 2012, 07:17 PM
Closed Account
Gordosoar-
Wingspan: 60"
Dowel booms: 14" long, 11.5" apart
Wing cord: 7" with 24"x 2" control surfaces
Maximum wing thickness: ~1.25"
Wing spar: 3/8" wooden dowel
Tail: 21" x 6"
Elevator: 2"x 11"
Stabilizers: 6" at bottom, 3" at top, 6" tall.
Body is a 2" x2.5" tube, 20" long

Rimshotcopter: In my experience: the thicker and larger cord the lower the stall speed, but you sacrifice efficiency, meaning short flight times. This is not always true, I plan on making a longer, skinny-er wing with a smaller thickness. This keeps weight down and will hopefully provide enough surface area to keep the model float-y even with extra weight.


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