SU-27 Flanker update - RC Groups
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Oct 02, 2001, 01:58 AM
Registered User
Daren's Avatar

SU-27 Flanker update


Here's the latest status update on Dan and my Flankers. The fan units (Wemo Mini 480s w/Speed 480 Race BB) are installable and the inlet and exhaust ducting has been completed. The other systems (retracts and elevons) were installed before the final sheeting went on and are complete. The rear hatch (where the speed board normally is) allows access to the battery pack (16 - 1100mah AU) and the front hatch allows access to everything else. Now it's on to sanding and finishing.<P>
<img src="http://www.allaboutguppys.com/flanker/flanker01a.jpg" width="800" height="606"><P>
<img src="http://www.allaboutguppys.com/flanker/flanker05a.jpg" width="800" height="294"><P>
<img src="http://www.allaboutguppys.com/flanker/flanker07a.jpg" width="800" height="566">
Last edited by Daren; Oct 02, 2001 at 02:31 AM.
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Oct 02, 2001, 02:24 AM
p471701
p471701
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daren: the pic's didnt show up...............gregg
Oct 02, 2001, 02:32 AM
Registered User
Daren's Avatar

Better?


Quote:
Originally posted by p471701
daren: the pic's didnt show up...............gregg
Arggh! How about now?

Daren
Oct 02, 2001, 02:38 AM
p471701
p471701
Guest
that's one good looking sukoi! the framing is so impressive it's a shame to cover it up.............gregg
Oct 02, 2001, 04:48 AM
Registered User
congrat on one piece of work !!
one thing, what is the metal in the nose ?

once again,congratulations !!

Avi
Oct 02, 2001, 10:05 AM
EDF Jet Jam 2017, June 15-18
Kevin Cox's Avatar
Great looking ship guys!
Oct 02, 2001, 10:20 AM
Electriaddict
dorysch1's Avatar
the thing in the nose looks like a big Capacitor? But Great looking Jet wow!
Oct 02, 2001, 10:33 AM
Flying Welder Pilot
Plane Crazy's Avatar
Nope, looks to me like a retract air cylinder in the nose. This thing have retracts??

Can't wait to hear about first flights.

Gordon
Oct 02, 2001, 11:07 AM
Registered User
Daren's Avatar

Air cylinder


Gordon gets the kewpie prize. The air cylinder will be housed in the hollowed-out nose cone (not yet attached).

Gregg:
Thanks for the kind words. Dan's is just as pretty.

Gordon:
Both do have retracts. We are using the Spring-aire 600 series.

To all:
Estimated AUW will be between 4.75-5.25 lbs. Once they're finished, we have a pretty stringent test program planned before the first flights; thrust and tailpipe velocity, then low and high speed taxi tests. Fortunately, we have a rather large paved flying field on which to perform these tests. We'll be posting more pics as the airframes progress.

Daren
Oct 02, 2001, 12:03 PM
Registered User
Hi
another question. do the fans deliver enough thrust and power ? it seems quite heavy for the thrust they would provide (400 grams each by wemotec ?)

Avi
Oct 02, 2001, 12:22 PM
Electriaddict
dorysch1's Avatar
you may want to run brushless motors to get adequate thrust on a small fan no? but I am new at this and relatively lazy to do the math I am getting burned out trying to get mine finished before it snows
Last edited by dorysch1; Oct 02, 2001 at 12:25 PM.
Oct 02, 2001, 12:58 PM
Lithium Member
Herb's Avatar
Quote:
Originally posted by avie
Hi
another question. do the fans deliver enough thrust and power ? it seems quite heavy for the thrust they would provide (400 grams each by wemotec ?)

Avi
Each MF480 will deliver about 14 oz of static thrust on 8 cells. With a weight of about 5pds and an est 10% in ducting losses, static thrust to weight is around 0.31, and Watts per pound around 55.
Oct 02, 2001, 12:59 PM
EDF Head
Haldor's Avatar
Sweet!

I hope the powerplants will do - power seem low as each fan wont provide more than ~140W in/84W out.
Oct 02, 2001, 01:23 PM
Registered User
Daren's Avatar

Hope so...


Quote:
Originally posted by avie
Hi
another question. do the fans deliver enough thrust and power ? it seems quite heavy for the thrust they would provide (400 grams each by wemotec ?)
Avi
The WB-57 weighs about the same and flies pretty well on this set up. Granted it has more (lots!) wing area, but also a higher amount of parasite drag. The Flankers' estimated wing loading is approximately 24 oz./sq. ft.

Our own concerns as to whether the power will be enough is why we have the testing planned that we do. If the static thrust and tailpipe velocity look okay, we'll move onto taxi tests. Fortunately, our runway is about 900 ft. of 150 ft. wide asphalt, so there's plenty of room to get slowed down (or land) in case it doesn't look like they'll fly. This is one of the advantages of ROG, you have a much wider go/no go window in which to decide.

Daren
Last edited by Daren; Oct 02, 2001 at 01:54 PM.
Oct 02, 2001, 04:29 PM
Dude, where's My Plane?
JasonJ's Avatar
ssssssswwwWWWWWWEEEEEEEEEEEeeeeEEEEEEEEETTTTTTTTTT TT!!!!!

Ahhhh I just LOVE that thing! Eeeahhhhh Its so cool I just cant take it! (Jason goes into crazed fit, contemplates quiting job and locking himself in a tool shed with a 2 year supply of balsa, tools, supplies and some food )

Ok, Im ok now, that thing is great guys! I love the SU 27, go figure . I also happen to have 2 minifan 480s and 2 race speed 480 bbs, so I am very optimistic (spelled hopefull) about your low cost power config .
Just imagine such a cool scale twin EDF with ROG retracts that could fly with less than $200 worth of power plant,,,,,,,, .


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