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Old Nov 03, 2012, 08:36 PM
AndyKunz's Avatar
Illinois
Joined Sep 2001
24,079 Posts
Time to revive this thread!

I was supposed to be working on a Kraft radio conversion but I forgot my battery! So I pulled my 40"-ish Shrike off the "work on me" bench and started back on it today. Instead of the Habu 32 fan system I decided to go with a Power 25. The fuselage sides are sitting on the bench now with the glue drying.

Photos soon!

Andy
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Old Nov 03, 2012, 09:46 PM
AndyKunz's Avatar
Illinois
Joined Sep 2001
24,079 Posts
Here you go. The fuselage is 3" wide internally simply because it made it easy for me to do and have lots of room. I want to stick a lot of telemetry toys inside.

It's going to be a little boxy, too. I'm getting pumped up now!

Andy
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Old Nov 05, 2012, 10:12 AM
nickeast
Stuart,FL
Joined Mar 2009
557 Posts
Looking good....

nick
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Old Nov 07, 2012, 09:34 AM
AndyKunz's Avatar
Illinois
Joined Sep 2001
24,079 Posts
Started a new thread to document the big Shrike. Find it here: http://www.rcgroups.com/forums/showthread.php?t=1765875

Andy
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Old Nov 26, 2012, 02:20 PM
Registered User
Land O Lakes, FL
Joined Jun 2007
15 Posts
First Shrike 40

Fianlly got aroudn to finishing up the Shrike 40.
Added retracts - probably should have examined Andy Kunz's build detail.
Saw somehting about the front gear door, but did not think that would work without another servo.
Powered with a Webra 50. Have pipe for it, but wanted to start with a fairl stock but hot engine.
I believe the retracts are from Hobby King - says no greater than 2.5KG which is about 5#.
All up finished - dry weight is 4.5#.
Not too surprising since most of my models come out on the heavy side.
Also adding to the weight - had to add 6 oz of lead in the tail to make the CG come out per the plans.
Haven't had it's maiden yet - actually waiting to find some canopy glue to seal up the canopy. Don't want Mr Einstein to get too drafty.
Any clues on the first flight off a grass field???
Pete
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Old Nov 26, 2012, 02:27 PM
AndyKunz's Avatar
Illinois
Joined Sep 2001
24,079 Posts
Pete,

That looks really nice! Great job!

You'll be fine without a door, you have a nice skinny slot to retract into. As long as nothing gets bent you should be golden.

I found that with the gear down it needs a bit of up-trim to compensate for the extra drag. Nice color scheme. You're going to love it!

First-flight videos are mandatory!

Andy
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Old Nov 26, 2012, 03:50 PM
Registered User
Land O Lakes, FL
Joined Jun 2007
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Thanks Andy - My thumbs will be shaking!
Pete
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Old Dec 02, 2012, 08:31 PM
nickeast
Stuart,FL
Joined Mar 2009
557 Posts
4dogspete,

Nice build .... just fly it ... grass might be a little tuff depending on the size of wheels that you have.

Nick
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Old Dec 23, 2012, 12:14 AM
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nickest its jeff from markham im gonna get started on mine with the werba 40 soon
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Old Dec 23, 2012, 09:04 AM
Registered User
Land O Lakes, FL
Joined Jun 2007
15 Posts
I did the maiden thing - twice so far. The first time it didn' t get off the ground becuase the wheel struts just were not stron enough and it bent one of the struts. Also I had to reinforce the front wheel mount by adding a plywood mount across the fuse to support the front retract servo.

All that fixed, and moving the battery fully to the rear and removing some of the rear weights, rechecked the CG balance and went back to the field to do another maiden. This was an Oh My - it turned out to be quite tail heavy.
Some of this is due to where I mount the fuel tank which is behind the CG due to the normal place for the fuel tank being occupied by the front retract and servo. So it was pretty scary and I killed the motor and tried to hold full down just to keep it straight, and it went into some high grass moving pretty slo. I was so surprised that it just did not snap when flying so slowly - just went in at about a 20 degree angle and did not do much damage at all.
Now I've reset the G a bit nose heavy by removing virtually all of the rear weights except for the 4-cell NiCad battery.
Will give it a shot again later this week - allowing for lower wind conditions and will post results.
Pete
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Old Dec 23, 2012, 01:30 PM
AndyKunz's Avatar
Illinois
Joined Sep 2001
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It will fly slow if you can slow it down, but you're right, once it decides to depart you're just along for the ride!

Andy
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Old Dec 23, 2012, 01:34 PM
nickeast
Stuart,FL
Joined Mar 2009
557 Posts
Pete,

The CG on thid plane is very sensitive.... get it where the plans call for .... esp for the first few flights and then find the sweet spot. Remember a forward CG flies poorly and an aft CG flies ONCE.....

Nick ( I do a lot of crash testing)
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Old Dec 23, 2012, 01:55 PM
AndyKunz's Avatar
Illinois
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24,079 Posts
Crash testing or Test Crashing, Nick?!?!?

Andy
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Old Dec 24, 2012, 12:28 PM
nickeast
Stuart,FL
Joined Mar 2009
557 Posts
Andy,

Test crashing seems to be the most often.... results arre always bad.

Merry Christmas!!!!

Nick
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Old Dec 30, 2012, 03:34 PM
nickeast
Stuart,FL
Joined Mar 2009
557 Posts
Ok... I'm at the farm this week and the WX has been awful ... so I did not bring any toys. Somebody must have done something..... I need a Shrike Fix

Nick
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