Need Help with Walkera SU 35  
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All Forums >> Electric Aircraft Universe >> Electric RC Jets >> Need Help with Walkera SU 35
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Need Help with Walkera SU 35 - 3/3/2006 6:19:43 PM   
3drc tim


 

Posts: 94
Joined: 2/23/2002
From: Simsbury, CT, USA
Status: offline 		Need Help with Walkera SU 35


I am building the Walkera twin EDF SU 35 (27 with canards.) I have read some other threads on this plane with upgrades on the airframe but not much consideration for the power system.

Weight (AUW) 32-36 oz.

75 mm EDF with 5 blades prox. 3" x 4.4" (pitch guesstimate)

Prefer 1-1/2 to 1 Power-to-Weight ratio, or low 16 to preferred 24 oz. thrust per motor

WS 42.5 1080 mm, WA prox. 300 sq. in., L 940 mm

Prefer less than 20 amp operation, but will consider up to 31 amps for use of 1 for each EDF, 2S or 3S 2100 15C battery per motor.


I bought mine at the WRAM show from BalsaPR.com. They recommended upgrade motors of around 3200 KV to replace the Speed 400's? included with the kit. The plane is reported on this and other sites as a real draggy airframe with stock top speeds of 40 to 50 MPH. I want to go at least 80 to 100 MPH. The BalsaPR recommended motor is a MTM 400F outrunner motor (KV?) driving the Walkera 3" diameter 5 bladed rotor. Based on the EDF 75 – 4 blade 4.3 pitch and 6 blade 4.5 pitch from GWS, the pitch on this rotor is probably 4.4". Thrust and other information available on the Walkera EDF unit is limited. One site recommended using a Hyperion X22-S motor with this fan as it is used on the EDF 50 and 64 GWS units; but this seems too small (300 size.)

AT LAST the question(s)—can I make a pair of EFlite Park 400 3700KV or 4200KV motors work and get up to 24 oz thrust per motor? I am thinking that inrunner motors are the right configuration for this because of KV; would outrunners really work well on a ducted fan? Or what motors will I have to use to achieve these objectives?

Any help would sure be appreciated. I just do not want to have a mild mannered, slow flying, jet fighter of this distinction.

Thanks, Tim
       Post #: 1

RE: Need Help with Walkera SU 35 - 5/13/2006 4:39:01 AM   
akelelias


 

Posts: 2
Joined: 7/4/2005
From: fort worth, TX, USA
Status: offline 		Tim,

I am currently building one. I will be using 2 wemotec minifan 480 and 2 brushless HET-RC 2W20 from warbird-rd.com capable of 60 amp each and 700Watts. The reason of this madness is that the frame produce a lot of drag. I had to trim the wings to make them scale. I will be using a 5 cell lipo. Mine will be around 50 oz in weight.

(in reply to 3drc tim)
       Post #: 2

RE: Need Help with Walkera SU 35 - 6/6/2006 8:33:08 PM   
Joe 1320


 

Posts: 30
Joined: 4/10/2006
From: Sebring, FL, USA
Status: offline 		I'm not doing the SU-35, but the F-22. I've done the upgrade to the twin brushless 380s with twin 30A escs, twin Walkera Fans and a Vampowerbatts 4500 mAh 3s2p. It has enough thrust to hover vertical with just a finger on the nose to keep it stable. The maiden will be sometime this week. Some of the speed secrets involve elimating drag. Closing up the cheater holes and perhaps necking down the exhaust a hair helpget more speed.....more so than just adding more power. It's the drag of the airframe that slows it down.

(in reply to akelelias)
       Post #: 3

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