The Boomerang Sprint Club - Page 5 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 10-14-2016, 01:44 PM   #41
kpark
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Re: The Boomerang Sprint Club


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The Travel project.

I wanted to see how small the Sprint could broken down into its many parts for
transportation. Well I was amazed it use about 1/2 the space in my Toyota Matrix
with the back seats down.

I came up with a prototype Sprint fuse body tray using 11/16" dense foam/rubber made
from interlocking gym mats - The tray uses 8 parts and is very sturdy when epoxied
together with 5min glue. With the weight of the fuse its not going anywhere it won't
slide about as the mat really grabs well.

The rest of the model: Wings, H-Stab and the two booms slide into 2 foam plates add
the f-glass wing tube and you the bonus of a handle to carry it about easily.
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Last edited by kpark; 10-14-2016 at 01:51 PM.
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Old 10-14-2016, 02:31 PM   #42
stegl
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Re: The Boomerang Sprint Club

Ken , You have room for one more Sprint....LOL.
Great setup. I found a large snowboard bag that lets me fit all the pieces in the one bag. I leave the CF tube and aluminum screw-in dowels on the aircraft.

OOps , forgot about the refueling tank, fire extinguisher, radio and support tools.
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Old 10-14-2016, 02:49 PM   #43
stegl
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Re: The Boomerang Sprint Club

Quote:
Originally Posted by DHC8 View Post
One of our guys has an ATJ140 in his, he got it up to 300kph... So not bad.. LOL. I am not looking for more speed, it's just far less expensive to use what I have then buying another turbine.

In terms of flight time and fuel burn it's not much more then other guys that have smaller turbines. With 30+lbs of thrust you can fly around at 1/3rd - 1/2 power and it still moves along pretty good.
Sure would like to see the installation on that one and wonder just how much weight up front to balance ?
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Old 10-14-2016, 04:34 PM   #44
RC_MAN
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Re: The Boomerang Sprint Club

Ken what glue did you use for the stand?
Looking good.
Now I understand why you make the big bucks
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Old 10-14-2016, 05:00 PM   #45
kpark
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Re: The Boomerang Sprint Club

I used 5min epoxy glue

Quote:
Originally Posted by RC_MAN View Post
Ken what glue did you use for the stand?
Looking good.
Now I understand why you make the big bucks
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Old 10-14-2016, 05:05 PM   #46
stegl
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Re: The Boomerang Sprint Club

Another glue that works well on plastics and rubber plus just about anything else and remains slightly flexible is Foam-Tac .
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Old 10-14-2016, 07:17 PM   #47
cicopo
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Re: The Boomerang Sprint Club

Ken I didn't see the 2 aluminum rods in that carrier. Are you hiding them or did you forget them?
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Old 10-14-2016, 08:58 PM   #48
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Re: The Boomerang Sprint Club

Quote:
Originally Posted by stegl View Post
Sure would like to see the installation on that one and wonder just how much weight up front to balance ?
The ATJ140SV replaced a JetCat P80SE. The mounting plates needed two additional holes and it was a drop in fit. No change was made to the down thrust angle. The JetCat V6 ECU is much larger than the Xicoy unit supplied with the ATJ so some space was freed up on the equipment tray. With the ATJ installed I was able to remove lead weight from the nose and reposition the battery packs forward to keep the same CoG at 9" from the flap TE.
G
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Old 10-14-2016, 11:38 PM   #49
stegl
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Re: The Boomerang Sprint Club

Quote:
Originally Posted by Gizmoman View Post
The ATJ140SV replaced a JetCat P80SE. The mounting plates needed two additional holes and it was a drop in fit. No change was made to the down thrust angle. The JetCat V6 ECU is much larger than the Xicoy unit supplied with the ATJ so some space was freed up on the equipment tray. With the ATJ installed I was able to remove lead weight from the nose and reposition the battery packs forward to keep the same CoG at 9" from the flap TE.
G
OK ; I see you have moved your C of G about 7/8 inch back from manual setting and with noseweight used with the JC P80 and moving the batteries foreward helped to handle the extra pound of turbine weight .
With the JM VT80 I was able to get away without adding any weight at a setting of about 9 7/8 inches.
Good to know . Thanks for the answer, Peter.

Be interesting to see what others have done and with all up weights. I did glass the center section and fuse with 1.25 oz cloth and paint.
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Old 10-15-2016, 08:48 AM   #50
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Re: The Boomerang Sprint Club

Quote:
Originally Posted by Gizmoman View Post
The ATJ140SV replaced a JetCat P80SE. The mounting plates needed two additional holes and it was a drop in fit. No change was made to the down thrust angle. The JetCat V6 ECU is much larger than the Xicoy unit supplied with the ATJ so some space was freed up on the equipment tray. With the ATJ installed I was able to remove lead weight from the nose and reposition the battery packs forward to keep the same CoG at 9" from the flap TE.
G
That will move it around for sure! 30lbs of thrust= insane verticals.

Care to mention the total cost of the engine to your door. You can send via PM if you prefer.

Thanks
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