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Old 10-06-2016, 10:53 AM   #31
stegl
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Re: The Boomerang Sprint Club


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Quote:
Originally Posted by kpark View Post
Does anyone know of a source of replacement plastic parts?

Servo covers, Wheel wells, Cockpit windshield, etc

Ken
Ever try using a 2 litre pop bottle cut down for a canopy in a pinch, some say it may work but may not quite be same overall shape, but close. May have a pair of wheel wells, new , and depending how man servo covers . Pm me if interested.

Last edited by stegl; 10-08-2016 at 11:03 AM.
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Old 10-08-2016, 08:55 AM   #32
Mike Anderson
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Re: The Boomerang Sprint Club

The build manual has this to say about rudder servos: "In order to save weight at the tail end, you can use “Midi” servos for the rudders."

Anyone care to guess what a "midi" servo is?

The build manual suggests rudder servos with torque in the 5 kg-cm (200 oz-in) range, so I assume the allowable torque of a 'midi' servo will be something less than that, but how much less could it be? Would 100 oz-in work OK?

Thoughts?
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Old 10-08-2016, 09:04 AM   #33
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Re: The Boomerang Sprint Club

Midi means medium size servo. About this size, (24.6×11.4×23.1 mm) The highest torque for this size servo is 84oz Thats what I was able to find and I used them in my Xcalibur. Didn't notice any stalling with them.

Honestly just use a standard servo and pay the weight penalty. The Sprint is very forgiving when it comes to balance. The Xcalibur NEEDS the lighter servos as it starts off tail heavy.

Last edited by excelsiuss; 10-08-2016 at 09:13 AM.
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Old 10-08-2016, 09:41 AM   #34
Mike Anderson
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Re: The Boomerang Sprint Club

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The build manual suggests rudder servos with torque in the 5 kg-cm (200 oz-in)
Woops - something wrong with what I looked up there. Looks like 5 kg-cm is actually more like 70 oz-in according to http://www.convertunits.com/from/kg-cm/to/oz-in
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Old 10-08-2016, 01:53 PM   #35
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Re: The Boomerang Sprint Club

I used JR 8411 in mine
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Old 10-08-2016, 07:30 PM   #36
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Re: The Boomerang Sprint Club

I hope to put together a 5/8" thick hard foam carry tote for the Sprint
The tote will let you transport the model in your car too & from the field with the model
all broken down. It was rainy today so I got busy making paper patterns for the
tote parts. All the parts will be interlocking with large tabs
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Old 10-11-2016, 03:44 PM   #37
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Re: The Boomerang Sprint Club

The Boomerang Sprint gang at the Stetson Flyers field.
G
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Old 10-12-2016, 12:59 AM   #38
stegl
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Re: The Boomerang Sprint Club

Quote:
Originally Posted by Mike Anderson View Post
Woops - something wrong with what I looked up there. Looks like 5 kg-cm is actually more like 70 oz-in according to http://www.convertunits.com/from/kg-cm/to/oz-in
Went with Airtronics 94820 , 29.5 gram wt and over 90 in/oz. (6.48 kg) torque at 6v. Digital with mg and double bearing out.....if you can find any out there.
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Old 10-13-2016, 10:16 PM   #39
Mike Anderson
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Re: The Boomerang Sprint Club

In the end I'm using some Hitec 7955TGs I have lying around. Way overkill, but they may as well fly something than gather dust.
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Old 10-14-2016, 11:09 AM   #40
stegl
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Re: The Boomerang Sprint Club

Mike , You used 7955 for the rudders as well ? Wow those are heavy ! what turbine did you use and how much weight up front ?
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