Stick and Tissue Forum - Suggested modifications to Guillow's Javelin?

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Suggested modifications to Guillow's Javelin? (Read 4743 times)

bigrip74 Ex Member	Re: Suggested modifications to Guillow's Javelin? Reply #7 - Jun 19^th, 2015 at 5:31pm	Print Post
	Quote: I could not add to Petes answers and a Big yes to no landing gear. Maybe a 5.5 inch orange prop. Bob I just noticed that I messed up on my typing. I meant to say 6.5, but Pete's 7" prop suggestion makes much more sense. Bob


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staubkorb 5 Star Member Offline Stick & Tissue Posts: 1428 Location: Germany Joined: Oct 22^nd, 2008	Re: Suggested modifications to Guillow's Javelin? Reply #6 - Jun 19^th, 2015 at 11:30am	Print Post
	Quote: Yikes. Since I'm new I'm barely able to keep up with all of this. Pete B. wrote Yesterday at 18:48:09: 1. Leave the landing gear off altogether. Adds nothing but weight and drag (and WILL break on the second flight!). I know the disadvantages but wouldn't the tissue be subject to repeated damage from landing on gravel or some types of grass? My LANCER is going on 10 years and , so far, no punctures except when the landing gear was still on. Once I clipped the gear, I added a second layer of tissue - cross grained for the added puncture resistance and a bit of needed nose weight. I was able to remove a bit of the clay the plane was carrying. I also modified the prop assembly to a folding prop. Some of my LANCER flights can be seen on my YouTube channel with the stock wing and a MUCH better wing from my ESTRELLA NEGRA (Black Star) - click HERE.

	( 155 KB \| 131 Downloads ) ( 112 KB \| 154 Downloads ) WWWoFF Wonderful Wacky World of Free Flight (with a bit of rc thrown in for giggles) Comparing Spammers to a pile of organic waste is an insult to the organic waste!
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Sky9pilot Administrator Offline Stick & Tissue Posts: 13264 Location: Kelso, WA 98626 USA Joined: Jan 9^th, 2010	Re: Suggested modifications to Guillow's Javelin? Reply #5 - Jun 19^th, 2015 at 10:27am	Print Post
	Supplies can be found from a number of quality suppliers: Volare/Shorty's Basement: Click Here Easy Built Models: Click Here You can find props, rubber, tissue and other supplies at these sites and several others. I've used both and have had very good service and quality products from these two. As far as nose plugs, check out the various build threads in the Current Builds section and the Cookup sections. Lots of various nose blocks/plugs done with several different models. Current Builds: Click Here Cook Ups: Click Here Thymekiller's Javelin reply #6 shows his prop/noseblock on the table showing how he made this removable and able to slide into the forward fuselage framework: Click Here Sky9pilot

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Colchicine New Member Offline Posts: 19 Location: Newport News, Virginia Joined: Jun 1^st, 2015	Re: Suggested modifications to Guillow's Javelin? Reply #4 - Jun 19^th, 2015 at 9:09am	Print Post
	Yikes. Since I'm new I'm barely able to keep up with all of this. staubkorb wrote on Jun 18^th, 2015 at 10:48am: 1. Leave the landing gear off altogether. Adds nothing but weight and drag (and WILL break on the second flight!). I know the disadvantages but wouldn't the tissue be subject to repeated damage from landing on gravel or some types of grass? staubkorb wrote on Jun 18^th, 2015 at 10:48am: 2. Modify the nose plug to make it removable (you won't otherwise be able to load, or effectively stretch-wind the motor). I hate to bother you for more detail, but without an example I'm at a loss as to how to do this. staubkorb wrote on Jun 18^th, 2015 at 10:48am: 3. Throw away the supplied rubber - order some 1/8th Tan Sport or the better Super Sport - the 16 foot package is adequate for now. My preference is to order from Amazon, but apparently that's not going to cut it. If I want to order from only one place for these supplies, what's the go-to shop? staubkorb wrote on Jun 18^th, 2015 at 10:48am: 4. Swap the prop for a 7 inch Peck or the new Chinese orange one (the orange prop will need to be bushed for a proper fit to the shaft). I'm assuming I'll be able to track these down once I know where to look, from #3. staubkorb wrote on Jun 18^th, 2015 at 10:48am: 5. Not practical now since the wing is already built, but still possible - reduce the slope (curve) of the airfoil from the leading edge to the first spar on the top - this will dramatically increase performance. I haven't covered anything. I took your suggested last night when I started sanding. staubkorb wrote on Jun 18^th, 2015 at 10:48am: I also added diagonals to the open bays on the top and bottom of the fuselage so that they looked like an "X" when viewed from the top. It's not really necessary if you use ESAKI tissue for covering, but the supplied tissue does not provide much torsional strength. Good to know! Luckily my LHS will be carrying Esaki for the first time starting next week.


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bigrip74 Ex Member	Re: Suggested modifications to Guillow's Javelin? Reply #3 - Jun 18^th, 2015 at 2:43pm	Print Post
	I could not add to Petes answers and a Big yes to no landing gear. Maybe a 5.5 inch orange prop. Bob


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staubkorb 5 Star Member Offline Stick & Tissue Posts: 1428 Location: Germany Joined: Oct 22^nd, 2008	Re: Suggested modifications to Guillow's Javelin? Reply #2 - Jun 18^th, 2015 at 11:04am	Print Post
	On my LANCER and JAVELIN, I also added diagonals to the open bays on the top and bottom of the fuselage so that they looked like an "X" when viewed from the top. It's not really necessary if you use ESAKI tissue for covering, but the supplied tissue does not provide much torsional strength. The added diagonals make the fuselage bomb-proof (nearly ). Use strips about 1/16" wide cut from the leftover fuselage side sheets (they're 1/20th") gluing them in with the "skinny" edge up and only back as far as the first rubber anchor. You might want to pick up a packet of 3/32nd" rubber also. Four strands (two loops) about 1.5 times the distance from the nose to the anchor is plenty for good flights.

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staubkorb 5 Star Member Offline Stick & Tissue Posts: 1428 Location: Germany Joined: Oct 22^nd, 2008	Re: Suggested modifications to Guillow's Javelin? Reply #1 - Jun 18^th, 2015 at 10:48am	Print Post
	1. Leave the landing gear off altogether. Adds nothing but weight and drag (and WILL break on the second flight!). 2. Modify the nose plug to make it removable (you won't otherwise be able to load, or effectively stretch-wind the motor). 3. Throw away the supplied rubber - order some 1/8th Tan Sport or the better Super Sport - the 16 foot package is adequate for now. 4. Swap the prop for a 7 inch Peck or the new Chinese orange one (the orange prop will need to be bushed for a proper fit to the shaft). 5. Not practical now since the wing is already built, but still possible - reduce the slope (curve) of the airfoil from the leading edge to the first spar on the top - this will dramatically increase performance.

	WWWoFF Wonderful Wacky World of Free Flight (with a bit of rc thrown in for giggles) Comparing Spammers to a pile of organic waste is an insult to the organic waste!
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Colchicine New Member Offline Posts: 19 Location: Newport News, Virginia Joined: Jun 1^st, 2015	Suggested modifications to Guillow's Javelin? Jun 18^th, 2015 at 9:57am	Print Post
	I'm new to model building, and after building a stick+tissue for static display I really want to get into rubber powered flying. So I got a Guillow's Javelin to learn with. So my question is, why kind of reasonable modifications can I make to 1) make it durable while I learn how to trim, 2) improve its performance? I've already added small gussets to areas around the dihedrals in the wing and the top leading edge of the rudder to hopefully increase the durability on crashes. This is the best picture of the skeleton I could find. I have already built everything but the fuselage. http://4.bp.blogspot.com/_FduD41Gpm8U/TTNHk1UfpBI/AAAAAAAAAQU/gAB9ThQ0uuU/s1600/... I was thinking I could eliminate the wooden landing struts and replace them with wire (what gauge, I have no idea). Also the nose of the fuselage is flat and square, I trying to think of ways to round that off. I am lightly sanding every piece and trimming any excess wood. Any other ideas?


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