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  #1  
Old 04-12-2011, 04:56 PM
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JumpJet JumpJet is offline
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Default C RC RG Model

I just thought you might like to see a new personal project I am working on. I drew the model up over the weekend. I started the build yesterday and this is what I have completed so far. The wing is a solid piece of 3/16”B-C grain sheet balsa. The wing has already been air foiled in the photo showing the parts of the model. The body is constructed out of 1/16” & 3/32” balsa with a couple of hollowed out blocks in the nose. I still have a lot of stuff to do like creating the hatch area and running the pushrods out the rear. Right now the model is held together with tape. I still need to dope and tissue the entire model before moving on to the final assembly. I love long tail-moments on my gliders and as you can see this one clearly shows that.

I haven’t a clue how this model will perform during boost but I am quite certain it will glide very nicely. I will build a couple more until I get her flying the way she needs to.

I am going to use a standard micro radio setup that uses a seperate reciever and servos.


Here are a few specs

Current weight 1.64 oz.
Span 23”
Wing Area 85” Sq Inches
Power B & C motors
Estimated Final Weight 3.2 oz.




John Boren
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  #2  
Old 04-12-2011, 09:53 PM
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kevinj kevinj is online now
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Definitely has that TLAR look about it. I'd give it a go if you have extra parts cut.

kj
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Old 04-13-2011, 12:15 AM
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BEC BEC is offline
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Indeed - that looks nice, John. I'll be interested to see how it goes from here.
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Old 04-13-2011, 07:20 AM
Eagle3 Eagle3 is offline
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Great looking project John! Looking forward to the flight reports.

Buzz
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Old 04-13-2011, 01:15 PM
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Last night I applied color tissue and Sig Nitrate Dope to give the model some color. Not my best job covering with tissue but I haven't covered anything this big in over thirty years. This covering added .33 ounces of weight. You will notice the Vertical Stab is not on the model at this time. It makes for easier photo taking.


John Boren
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Old 04-13-2011, 01:21 PM
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The glider looks great, but I sure would not want to use Nitrate Dope on anything going to be even remotely close to ANY sort of flame, or for ANY rocketry application other than for mixing pyrogen for igniters.
The Germans learned the hard way with their Nitrate-coated hydrogen-filled dirigibles.
Is there a reason why you used this instead of Lite-Coat Butyrate ?
Lite Cote is low-shrink clear butyrate from Sig, and has the benefit of NOT igniting like a tinderbox if one comes within a foot of it with a flame.
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Old 04-13-2011, 02:20 PM
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I used Nitrate dope since it doesn't shrink and I had in on hand. I used Nitrate Dope on every NARAM 52 contest model I made last year and never had a problem with them catching on fire. . The Myth Busters did a segment on the very issue you mentioned concerning the Hindenburg. There was more to its fast burning destruction then just the Nitrate Dope.

I'll give a flight report when this model is completed. If it does in fact burn up, I certainly won’t use Nitrate Dope Again!


John Boren
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Old 04-13-2011, 03:05 PM
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Default Fire retardant

Quote:
Originally Posted by JumpJet
There was more to its fast burning destruction then just the Nitrate Dope.
... I think the powdered aluminum additive had a role if I recall.

John,

Great looking design! Best of luck with the test flights. Also, have you ever tried adding Borate and Borax (in solution) to water based polyurethane? I understand a very thin wash of that mix on balsa or paper tube makes an excellent fire retardant.

Regards,

FlyBack
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  #9  
Old 04-20-2011, 11:54 PM
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I just completed the installation of the radio gear. She came out a lot heavier then I expected but I didn’t try very hard in getting the lightest weight radio either. I still may need to add some nose weight to get it to balance but I won’t know that until I do some test glides, so a lighter radio may not have done much good any way.

The best part about this model is that I had everything laying around the shop so it didn't cost me a penny in new investment.

This is what I ended up using for a radio.

Servos 4.4 gram each
2 Cell Lipo 250 mAh 17 grams
Receiver Hitec Micro 05S 9.4 grams
Speed Control GWS 2Amp 6 grams Used as a BEC

Total model weight so far 3.8 ounces


John Boren
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  #10  
Old 05-04-2011, 06:03 PM
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Not much more to report right now on the glider other then I did some test glides with it and I was landing a hundred plus feet away. It appears to glide very well. I had to add some up elevator so I may need to change the incidence of the stab by about a half a degree on the next model. And I’m pretty sure it isn’t nose heavy since she balances around 60% back from the leading edge at the root cord. Assuming it doesn’t crash and burn on the first launch I’ll know what she needs to dial her in gliding wise. My biggest fear is the boost right now but if the weather is good, I’ll know how she flies this weekend.


John Boren
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