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Dec 21, 2003, 09:13 PM
Registered User

What flight pack are you using?


Hello,
I have an EAM FA-18 and am wondering what type of receivers people are using. I have a futaba 1024PCM radio.....was wondering if a PCM transmitter will work with a Hitec FM rx, given that the channel matches up?

Also, was wondering what type of servos are sufficient with a ducted fan aircraft? I was thinking of HS-55, but would this be too weak?

Any inputs greatly appreciated.

Thanks,
Big Ben
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Dec 21, 2003, 09:27 PM
EDF Head
Haldor's Avatar
Use no smaller servo's than HS81's.
Yes you can use the Hitec FM rx provided the channel and shift match your tx/frequency.
Dec 21, 2003, 10:03 PM
Registered User
Haldor,
Thanks for the info! I figured that the HS-55's would probably be too small for the work.

Question: How so you determine the frequency "shift" on the transmitter? And how do I know that it would match the Hitec rx's?

Thanks,
Big Ben
Dec 21, 2003, 10:18 PM
EDF Head
Haldor's Avatar
In the US you guys have positive shift radio's and negative shift, this need to match on both the tx and rx. We dont have this over here so I cannot comment further.

If you have same shift on both the tx and rx then you can use the Hitec rx using same channel/frequency obviously.
Dec 21, 2003, 10:49 PM
Registered User
Haldor,
Thanks for the info!

Big Ben
Dec 21, 2003, 11:39 PM
Registered User
Haldor,

I'm using CS10's on the ME P. 1101 and your Mig-29 with no problem. I think the 55's will work fine in my experience.

I'm using them on the ailerons only though. On elev I'm using CS21's.

Ben,

Have fun with the Bug, you'll love it!

Steve
Dec 22, 2003, 04:05 AM
Registered User
trondb's Avatar

Re: What flight pack are you using?


Quote:
Originally posted by Big Ben

Also, was wondering what type of servos are sufficient with a ducted fan aircraft? I was thinking of HS-55, but would this be too weak?
My opinion is it depends on which type of edf . In a light slow jet like the GWS A-10 the micros (e.g.Hitec 55) is more than enough.
Faster ,heavier ones needs stronger servos like the HS 81 and similar.

Trond
Dec 22, 2003, 12:48 PM
Registered User
I thought so too. But by appication in two fast jets I've found it's not true or I'd have little bits by now.

Steve
Dec 22, 2003, 01:22 PM
Registered User
I've used HS-55's on the ailerons of lots of 80-100 mph 3-3.5 pound EDF's with no problems. I do use an HS-81, HS-85 or JR - 331/341/351 on the elevator though.

On the other hand, if your ailerons are likely to hit the ground on landing (low wing) then I'd go with an HS-81 or HS-85. And if the plane is heavier than 4 pounds make em metal geared. I had HS-81's on the ailerons of my 6.75 pound Banshee. Both plastic geared servo's stripped on different landings so they got swapped out for HS-85MG's
Dec 22, 2003, 01:50 PM
Lithium Member
Herb's Avatar
HS-85 MG on the bigger stuff, JR 9g or HS-55's servos on the smaller stuff. Never had a problem with any Hitec servo in 4 years.
Dec 22, 2003, 02:15 PM
Senior Member
sguty's Avatar

servo load spreadsheet


If anyone's interested, I did a spreadsheet to calculate servo loads, based on an article that ran in RCM about two years ago.