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Old May 31, 2012, 08:34 PM
jayb1rdz is offline
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Never fly an A model anything!
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Herb, the HK version is now in stock and shipping. It's unlikely to have the wing strengthened at all. In your opinion, can the retract rails be strengthened from under the wing by adding ply blocks and webbing? Or is going through the top of the wing the only way???
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Old May 31, 2012, 10:05 PM
urrl is offline
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In the pipe 5 by 5...
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I decided to table the 12 blade for now and replaced it again with the 5 blade. I must have done a better job of making sure the ducts were sealed because now I can loop better and it really feels faster with the 6S 5000mAh batteries.
Old Jun 01, 2012, 03:50 PM
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Quote:
Originally Posted by jayb1rdz View Post
Herb, the HK version is now in stock and shipping. It's unlikely to have the wing strengthened at all. In your opinion, can the retract rails be strengthened from under the wing by adding ply blocks and webbing? Or is going through the top of the wing the only way???
Hi Jay,

Yes I think the HK one has most likely exactly the same wing, and therefore the same problem ...

Yes the retract mounts can be strengthened, I did some of that initially but then had to do some more later.

I also believe all of it can be done from the bottom, without ruining the appearance on the top wing.

If it is done right (ply doublers on ribs and spars, reinforced shear webbing, epoxy & glass or fiber on the joints, laminating epoxy on the top sheeting close to the retracts etc.) then very little weight is added.

The crucial point is to SPREAD the load and make everything nice and rigid.

The BVM F-86 wing below is a good example of how it's done.

.
Old Jun 01, 2012, 06:28 PM
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Herb, thank you for being so generous with your experience. It would be a shame to let an attractive model get hangared due to fear of landing or worse wrecking through poor design.
Old Jun 02, 2012, 10:31 AM
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Flew seven packs this morning. Loops, inverted circling, barrel rolls, touch and go landings. She seems faster now even though only 6S 5blade. I think reinstalling the ducting made a difference. Love this jet. I'm thinking of buying another CMP jet.
http://www.scaleflying.com/BAE-HAWK-...F-_p_2506.html
Old Jun 03, 2012, 08:17 PM
1moparman1 is offline
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chillax! It's only a Hobby
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Originally Posted by urrl View Post
Flew seven packs this morning. Loops, inverted circling, barrel rolls, touch and go landings. She seems faster now even though only 6S 5blade. I think reinstalling the ducting made a difference. Love this jet. I'm thinking of buying another CMP jet.
http://www.scaleflying.com/BAE-HAWK-...F-_p_2506.html
I have one of these too
still in the box, might get to it in a few
the paint and color looks great!!
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Latest blog entry: Hk cri cri
Old Jun 04, 2012, 11:13 PM
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So guys I have the 10s 90mm HK fan - is there any reason not to put it in the L-39?
Old Jun 05, 2012, 07:56 AM
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Also... anyone checked out the gear that comes with the pnp version offered by Aerodyne/Scaleflying?
Old Jun 05, 2012, 01:38 PM
urrl is offline
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A few things happened during my five flights for the day. First I caught a defective rechargeable Tx AA battery which can disconnect intermittantly. A $6 battery could have destroyed a $600 jet. Though it was brand new it was defective. Then during or after my third flight I lost a flap servo. Then one of my elevator servos became unglued. Not sure whether it was during flight or not. Hopefully what does not destroy the L-39 will make it stronger.
Old Jun 05, 2012, 06:12 PM
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Originally Posted by morgusmax View Post
So guys I have the 10s 90mm HK fan - is there any reason not to put it in the L-39?
Same here, I ordered the 10cell version as well
Old Jun 07, 2012, 10:21 AM
urrl is offline
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Check the flap hinges now and then. One conecction on each flap was loose; one actually came out, that's how i discovered it and used some epoxy on both. I need to slow down, been running thru 5 packs on this jet daily for about two weeks.
Old Jun 07, 2012, 12:11 PM
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Quote:
Originally Posted by morgusmax View Post
So guys I have the 10s 90mm HK fan - is there any reason not to put it in the L-39?
Quote:
Originally Posted by SlayerNZ View Post
Same here, I ordered the 10cell version as well
Whatever you put in there make sure you watch your WEIGHT as the wing can't take much stress

I use a very lightweight fan combination (WeMoTec Midifan).

Quote:
Originally Posted by morgusmax View Post
Also... anyone checked out the gear that comes with the pnp version offered by Aerodyne/Scaleflying?
Yes, https://www.rcgroups.com/forums/show...67&postcount=3

.
Last edited by Herb; Jun 07, 2012 at 12:16 PM.
Old Jun 08, 2012, 03:53 PM
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The weight issue is a tough one. 10s and the alloy fan will add quite a bit. Decisions decisions!
Old Jun 08, 2012, 04:38 PM
jayb1rdz is offline
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I suppose, if you are going to open the wing to strengthen the retract rails and attachment points, you might as well add straight spam wise as well.

The wing surface area looks as though it could handle the loading.

Herb, is the problem the engineering or the surface area? I was planning 7s 3800s Mega 1400 kv in the Mach all alloy.
Old Jun 08, 2012, 07:01 PM
urrl is offline
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Does anyone know what scale our models out? I'm looking for some Breitling decals and want to be sure of the scale.
http://www.hobbyshop.cz/shop/1-72-de...-72-decal.html

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