A new 100% EPP foam Scram-Blur J-250 build/Q&A thread - RC Groups
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Jul 09, 2004, 12:09 AM
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A new 100% EPP foam Scram-Blur J-250 build/Q&A thread

A new version of the Scram-Blur J-250 is now available with the all EPP cnc cut cores.The kit also contains the J-250 motor,props,covering,and more.(see kit contents www.sylvanaircraft.com) (Note:The all epp version is not available on the web site at this time contact us). We will be building this kit and taking a series of pictures as we present this thread.This will be a step by step build thread that will lead up to the maiden flight on video.We will respond as promptly as possible to any questions or comments we receive.

To build this kit you will need the following equipment:

Modelers knife and blades
Needle nose pliers
5 Min. epoxy
small bottle of ca.
Low temp hot glue gun and glue sticks
soldering iron and electrical solder
3m 77 adhesive spray
ball pen or marker

Radio gear required:
1x 2's 1200mah li-poly
1x micro RX
2x gws naro servos or equivalent
1x 10amp esc

Build thread as follows:
Last edited by sylair; Jul 09, 2004 at 12:13 AM.
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Jul 09, 2004, 12:45 AM
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Step 1: Open box and notice that the kit contains all the parts nessary to build this wing.There are no parts you need to purchase.
Here is the list of contents found in the kit:
1x set of epp cnc cut wing cores
1x roll of 55yrd colored covering tape
1x roll of nylon tape
1x johnson 250 motor
1x capacitor
1x pre cut motor mount
1x set of pre cut elevons
1x 1/64 plywood bottom plate
1x set of control horns
1x set of coroplast wing tips
1x set of push rods
1x capacitor
2x 4x4 props
2x rubber prop adaptors
1x set of hook and loop velcro
2x zip ties
1x popsicle stick
1x piece of sand paper
1x set of directions

Note: All motor,motor mount and prop slots have been pre cut.
Jul 09, 2004, 07:59 AM
-- Made in DETROIT --

EPP Scram-Blurr....

Tell us more...it's gonna be heavier...cause of the diff foam,right..??Got any idea how much more..??Cost..??
Jul 09, 2004, 12:55 PM
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The epp cores are lighter than the combination (original pink/epp) cores.The old combination cores weigh in at 23 grams and the new all epp cores only weigh 17 grams.The cost per kit will be $32.
Last edited by sylair; Oct 04, 2004 at 01:29 PM.
Jul 09, 2004, 01:26 PM
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Step 2:

Remove cores from box and lay on a flat surface.Also notice that the bottom surface has a pre cut motor mount slot.
Jul 11, 2004, 06:57 PM
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Step 3:

Using a low temp hot glue gun or 5min. epoxy spread glue on one of the root cores.Then hold the two root cores together making sure they are aligned. Remove all glue squezee-out immediately, making sure to include the motor mount cut-out area on the bottom surface of the wing..

Note: We prefer the low temp hot glue over the 5min epoxy because the hot glue seems to help provide a more shock absorbant nose,whereas the epoxy seems to crack.

Nope:Make sure that the glue gun is a low temp one. iIf not, it can melt the foam.

p.s. video will be up at end of the build, depending on the weather lol.
Last edited by sylair; Jul 12, 2004 at 05:21 PM.
Jul 12, 2004, 05:45 PM
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Step 4:

Gluing in the motor mount, using 5min min. epoxy or gorilla glue spread a thin layer of the glue in the pre cut motor mount slot.Make sure that the motor mount is slid all the way forward in the slot and that it is level with the bottom surface.
Jul 14, 2004, 12:03 PM
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The wings are made of 1.3# epp not the heavy 1.9#

Aug 15, 2004, 02:10 PM
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What happened to the rest of the build? I have one of these started on the bench, but the instructions say the center of gravity sould be at 6 1/6 inches, which seems way back to be, and I will have to put the battery right back by the motor.
Sep 28, 2004, 02:40 PM
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Ralph_D's Avatar
I just purchased one of these and I'm really interested in hearing about the rest of the build and even more interested in seeing a video of the wing in flight.

Last edited by Ralph_D; Sep 30, 2004 at 01:10 AM.
Sep 30, 2004, 01:10 AM
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Ralph_D's Avatar
Hmmm...wonder why the build progression stopped?

Sep 30, 2004, 01:26 AM
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We are about to resume this thread within the next day or two. We sort of got busy with business and kids and lost it for a while LOL.Watch closely in the next few days, maybe even sooner. Thank you.

Sep 30, 2004, 01:56 AM
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Ralph_D's Avatar
Awesome! Thanks!

Oct 04, 2004, 01:59 PM
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Applying the plywood bottom plate:

Remove the 1/64th plywood bottom plate and spread a thin layer of 5min. epoxy on one side.Lay the bottom plate on the wing with the back edge flush with the back edge of the wing and the front point aligned with the center line.Hold down tight till glue is dry.

Note:magnets can be used to help hold the plywood plate on till dry.
Last edited by sylair; Oct 04, 2004 at 02:02 PM.
Oct 04, 2004, 04:21 PM
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cuting holes for zip tie:

Now coming from the top of the wing cut through the plywood following the precut zip tie slots of the motor mount.