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Old Oct 28, 2013, 09:43 PM
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kenelder's Avatar
USA, FL, St Petersburg
Joined Dec 2003
980 Posts
I have one, too heavy for the power it gives. Go with a high KV motor so you can turn a smaller diameter prop at high rpm. Much more manageable
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Old Nov 01, 2013, 05:58 AM
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Phaedra's Avatar
Belgium, Flemish Region, Duffel
Joined Apr 2012
768 Posts
When I look at one of the HK offerings CR23L, it would give me maximum 960g thrust. It weighs around 100g (hard to tell what is the real weight at HK, they give different numbers for the same item....), my model weight so far is over 500g, including the currently mounted motor.
This means that I would end up worst case around 700g, including an extra ESC if I use this setup.
I decided to give it a try, for the heck of it. For the cool-factor.... If it doesn't work out well, I'll use it in another model. Like a Bugattti R100 for instance, which uses a contra-rotating motor by design.
So while I wait for the new motor, I'm putting the 104 aside for a little while, and finish some other projects. And -shock- clean up my workspace....
And maybe have a look at the remains of an old party tent, to see if I can use the tubes to make a bungee launch ramp out of those. Yes, I might do that. :-)
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Old Dec 31, 2013, 09:19 AM
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Phaedra's Avatar
Belgium, Flemish Region, Duffel
Joined Apr 2012
768 Posts
I picked up this build again after a long pause.
I'm looking at installing the bungee towhook, and I was thinking of installing it in front of the CG.
Installing it on of aft of the CG would make the model unstable in pitch during launch, I guess.

Any tips or hints on this?
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Old Dec 31, 2013, 09:32 AM
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United States, VA, Herndon
Joined May 2007
1,002 Posts
One hint I give is to definitely NOT install the hook aft of the CG.

I typically measure the distance from the nose to the CG and install the launch hook at between 30-50% that distance from the nose. I've found the further forward in that range the more flat the launches will be, which is what you typically want for launching a jet. You need airspeed more than you need altitude.

Installing the hook too close to the CG risks going into a high AOA on launch, possibly even ripping the wings off depending on the aircraft and the tension on the bungee.
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Old Dec 31, 2013, 09:41 AM
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Belgium, Flemish Region, Duffel
Joined Apr 2012
768 Posts
That's what I figured too….thanks for the info!
And happy new year to all!

Phaedra
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Old Jan 04, 2014, 01:49 PM
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Phaedra's Avatar
Belgium, Flemish Region, Duffel
Joined Apr 2012
768 Posts
Almost finished planking the boat:
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I find the tailfin less than scale, the fuselage just seems too fat near the tail:
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As can be seen on the first pic, I also started finishing the nose part.
When all this is done, I'll do the major spackling.
I'm pondering if I should lay a cover of glassing, and if yes, if I should do it before or after the maiden....
I'm not too sure about the outcome of the maiden, so I don't want to do too much finishing before.
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Old Jan 12, 2014, 02:15 PM
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Belgium, Flemish Region, Duffel
Joined Apr 2012
768 Posts
Covering is finished. This means that the model is ready in its raw form, still needing a lot of spackling and sanding.
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At least now I can clean out the mess of scrap depron and dust before I cover it with a layer of fibre and wbpu. But right now my building table looks like a battle field....
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Old Jan 12, 2014, 02:48 PM
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Antwerp, Belgium
Joined Sep 2004
298 Posts
Coming along nicely
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