Designed by Jet pilots for Jet Pilots
09-13-2009, 09:25 PM
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Designed by Jet pilots for Jet Pilots
http://www.youtube.com/watch?v=D3QB4xBTyEw
Designed built and flown by Justin Sands
This new L-39 for 69mm fan units. 1/12 scale
09-13-2009, 10:36 PM
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RE: Designed by Jet pilots for Jet Pilots
Looks Kolibri ready to me! What is the all up weight with the 4 cell and motor? The kolibri with fuel will be about 1/4 heavier at take off and 1/2 lighter at landing.
Looks sweet Justin!
Chad
Looks sweet Justin!
Chad
09-14-2009, 11:06 AM
#9
RE: Designed by Jet pilots for Jet Pilots
Nice plane... sound sweet with no ducting
is the lack of ducting hurting the flight times and top speed?
Also like the battle feild 1942 theme music...
... I've heard that song for many hours into the night
nice job
Ron
is the lack of ducting hurting the flight times and top speed?
Also like the battle feild 1942 theme music...
... I've heard that song for many hours into the nightnice job
Ron
09-14-2009, 04:36 PM
#12
RE: Designed by Jet pilots for Jet Pilots
Great to see it flying Justin. Looking good. You are part of a dying breed. A Jet pilot who can design, build, finish, fly and compete... And be an expert at all disciplines. Not too many of your kind out there.[sm=thumbup.gif][sm=thumbup.gif]
09-15-2009, 10:50 AM
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RE: Designed by Jet pilots for Jet Pilots
Thanks guys,
I am not that special I could not have done it without the help of and support of my other jet buddies. Special thanks goes to Ad Clark, Addison Clark, Paul Bageman, Mark Taylor and Dan Gill...This was not a slam dunk project for me...I had to have the help of other experienced modelers to make it a success.
I am not that special I could not have done it without the help of and support of my other jet buddies. Special thanks goes to Ad Clark, Addison Clark, Paul Bageman, Mark Taylor and Dan Gill...This was not a slam dunk project for me...I had to have the help of other experienced modelers to make it a success.
09-15-2009, 11:25 AM
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RE: Designed by Jet pilots for Jet Pilots
You can not have ducting with this set up. There is not enough volume of air for the fan to produce efficient thrust. That is the nature of the beast in Fans vs. Turbines.
Justin Sands
Bvm Rep
Team JR/Horizon
Justin Sands
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Team JR/Horizon
09-15-2009, 01:12 PM
#18
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RE: Designed by Jet pilots for Jet Pilots
Understood you have to trade total scale appearance for good EDF efficiency sometimes. On the other hand, there is nothing scale about a cheese grater on the bottom either. For me, I would rather have over-sized inlets and use ducting. But, as they say, that is why Baskin Robbins makes 31 flavors.
In any event, you did a nice job of it.
In any event, you did a nice job of it.
09-15-2009, 01:24 PM
#19
RE: Designed by Jet pilots for Jet Pilots
ORIGINAL: Socomon
Understood you have to trade total scale appearance for good EDF efficiency sometimes. On the other hand, there is nothing scale about a cheese grater on the bottom either. For me, I would rather have over-sized inlets and use ducting. But, as they say, that is why Baskin Robbins makes 31 flavors.
In any event, you did a nice job of it.
Understood you have to trade total scale appearance for good EDF efficiency sometimes. On the other hand, there is nothing scale about a cheese grater on the bottom either. For me, I would rather have over-sized inlets and use ducting. But, as they say, that is why Baskin Robbins makes 31 flavors.
In any event, you did a nice job of it.
Great lookin alba justin.. sign me up for one 
09-15-2009, 01:58 PM
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RE: Designed by Jet pilots for Jet Pilots
Nice job Justin looks great! Great to see you at Montana Jets. Haha by the way we bought that E-Flite Hawk but haven't gotten it up in the air yet. Loved the battlefield music as well.
Andrew
Andrew
09-15-2009, 03:05 PM
#21
RE: Designed by Jet pilots for Jet Pilots
My Sapac L-39 is 70mm and has full ducting...
I'd rather have the ducts than the holes in the bottom... if you don't hear what customers want you don't get any feed back
So please don't take that a trolling..it looks like a great plane.. I only fly electric jets and I'm always happy to see something new com to the market
There a few makers out there with the cheater holes and I just don't like
here you can see the intakes aren't that oversized and work great
http://shop.sapacamerica.com/browse.cfm/4,1624.html
but I'm sure you'll sell a ton of them
Ron
I'd rather have the ducts than the holes in the bottom... if you don't hear what customers want you don't get any feed back
So please don't take that a trolling..it looks like a great plane.. I only fly electric jets and I'm always happy to see something new com to the market
There a few makers out there with the cheater holes and I just don't like
here you can see the intakes aren't that oversized and work great
http://shop.sapacamerica.com/browse.cfm/4,1624.html
but I'm sure you'll sell a ton of them
Ron
09-15-2009, 07:12 PM
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RE: Designed by Jet pilots for Jet Pilots
ORIGINAL: Ron101
My Sapac L-39 is 70mm and has full ducting...
I'd rather have the ducts than the holes in the bottom... if you don't hear what customers want you don't get any feed back
So please don't take that a trolling..it looks like a great plane.. I only fly electric jets and I'm always happy to see something new com to the market
There a few makers out there with the cheater holes and I just don't like
here you can see the intakes aren't that oversized and work great
http://shop.sapacamerica.com/browse.cfm/4,1624.html
but I'm sure you'll sell a ton of them
Ron
My Sapac L-39 is 70mm and has full ducting...
I'd rather have the ducts than the holes in the bottom... if you don't hear what customers want you don't get any feed back
So please don't take that a trolling..it looks like a great plane.. I only fly electric jets and I'm always happy to see something new com to the market
There a few makers out there with the cheater holes and I just don't like
here you can see the intakes aren't that oversized and work great
http://shop.sapacamerica.com/browse.cfm/4,1624.html
but I'm sure you'll sell a ton of them
Ron
You could lay up some ducts for Justins bird and experiment but the chances are it won't perform too well.
09-15-2009, 08:15 PM
#25
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RE: Designed by Jet pilots for Jet Pilots
As I mentioned above. The intakes on the K&A L-39 (www.kamodels.com) are not too much bigger and the planes uses full intake ducting which is going to make the model faster and more efficient than a cheese grater cheater hole. I am not knocking this fellows nice airplane, I am just suggesting there may be some room for improvement without compromising too much of the scale appearance from above while improving the scale appearance from below. The risk of FOD damage is also reduce without the bottom cheater holes.
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