Thread Tools
Old Mar 09, 2012, 10:57 PM
itsmillertime is offline
Find More Posts by itsmillertime
Registered User

Need advice building a plane.

Figured I should cross post this here to get some more exposure.

I've wanted a Sbach ever since I fist saw one and am trying to decide between these two:
The 39" "BX"

The 40" "SC"

I originally wanted the "bx" because it looked a little more durable but I don't think that is the case any more and would rather have the more scale looking "SC".

I already have my servos ( ordered. Those servos look comparable to the HS-65MG's but a lot cheaper and are digital so I should be able to get more than 90 degrees of travel out of them.

I am probably going with a 4A esc ( The 40A is probably way more than needed but it seems to be the smallest size with a built in 6V BEC. Or are there any other smaller switching ESC's with a built in 6 volt BEC. The HobbyWing I linked is switchable between 5.25 and 6V but I think 4.8 and 6V would be better. Then I could run on 4.8V to conserve battery when faster throws and higher torque isn't needed. Or would a smaller more appropriate sized ESC and a seperate BEC be better?

Batteries will be Gens Ace 25C in either 1000 or 1300mah.

Choosing a motor has been the most difficult for me so far. Matching kv's to props, etc... The recommended motor is the Dualsky XM2834CA-9 980Kv which weighs 70g. So I'm looking for other motors in the 70g range which are the:
Hengli Brushless Outrunner Motor W3542-850
Twisted Hobbys 1250kv Telink motor
I believe the same 1250kv motor but a lot cheaper.

After doing some research and playing with WebOcalc I think I've determined a APC 11x5.5 E would be the most efficient prop for this plane.

This is with the recommended Dualsky 980kv motor:

Is 1.4 to 1 about the best I can do with a 70g motor? I'd like around 2-2.5 to 1 I can't seem to get any slow fly props on WebOcalc but it's my understanding that you should only use them when you can't fit a larger prop. And that they'll make more thrust but at a higher amp draw.

This on is with the 1100 kv motor from Twisted Hobbys:
Sign up now
to remove ads between posts
Old Mar 10, 2012, 09:42 AM
jetinteriorguy is offline
Find More Posts by jetinteriorguy
Registered User
Have you considered the 48" version, generally the larger ones fly much better than the smaller ones. Of course they are a little more expensive, but from my experience it's well worth it.

Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion Need advice building a plane. itsmillertime 3D Foamies 18 Mar 11, 2012 12:31 AM
Build Log new to quadcopters, need advice building AntifaCam Multirotor Talk 18 Nov 21, 2011 04:19 AM
Question i need some advice with building a plane codenameJEFE Beginner Training Area (Aircraft-Electric) 9 Jul 15, 2006 06:18 PM
Discussion i need so advice with building a plane codenameJEFE Electric Ducted Fan Jet Talk 1 Jul 13, 2006 05:13 PM
Building plane...need advice... Gizzmo0411 The Builders Workshop 15 May 19, 2004 11:17 PM