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The Norwegian Gnat Squad

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Lucas Hofman06/04/2020 09:19:03
665 forum posts
375 photos

I had expected more too. But this was with 4-5 year old 25C battery. But at least it showed me there is nothing wrong with the fan and I can glue it in the model tonight.

I wondered whether silicon may be better then hot glue since it will remain somewhat flexible. What do you think?

Regards, Lucas

Tim Ballinger06/04/2020 09:48:22
avatar
778 forum posts
283 photos

Lucas,

what is clear is that thrust to mass ratio is crucial with all the mini jets. The gnat is perhaps the leanest but still needs max thrust to get away from a hand launch in light winds. I spent some time testing with larger cheat intakes to get the figures I quoted. I only managed 2 sessions between flooded fields and virus lockdown but it flew away with virtually no dip.

Can not help much on the glue front except to say that a couple of folks have had the fan come loose when it belly flopped following a failed launch so make sure it is secure. I used multiple hot glue blobs .

Timz

Dickw06/04/2020 10:51:28
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668 forum posts
93 photos
Posted by Tim Ballinger on 06/04/2020 09:09:08:........Those figures were with a newly charged 40C battery. I’ve seen others measuring 38A but not sure of the battery status.

Tim

38A? That might have been me, but I was using a 4s system to get 680gm thrust at 51,500 rpm.

Unfortunately the lock down means I have not flown it yet sad

Dick

Lucas Hofman07/04/2020 20:44:03
665 forum posts
375 photos

A little progress today. The fan is in place, glued with silicon. Hot glue always burned my fingers and I remember it to be brittle when cold.

Used a square at the end to check that the sides are parallel. Tomorrow we will pull the sides together are see if they ar....

img_6790.jpg

Lucas Hofman09/04/2020 20:52:12
665 forum posts
375 photos

Trust tube in place. I do not remember who gave the tip of some pipe isolation material to press the thrust tube to F10. I did not have the correct diameter of pipe isolation foam, but a little sponge did the job just as well.

img_6800.jpg

Started with the nose block. This is going to be some sanding!

img_6801.jpg

Cheers, Lucas

Lucas Hofman11/04/2020 12:09:12
665 forum posts
375 photos

How does one feel after one has glued the bottom without having mounted the pushrods first? Exactly.

Happily the glue had not set yet....

Lucas Hofman11/04/2020 19:10:01
665 forum posts
375 photos

And now in the correct order:

img_6806.jpg

img_6807.jpg

Cheers, Lucas

Tim Ballinger12/04/2020 09:30:12
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778 forum posts
283 photos

We all have those moments !

Lucas Hofman12/04/2020 20:57:15
665 forum posts
375 photos

I like this!

img_6810.jpg

Lucas Hofman14/04/2020 21:26:35
665 forum posts
375 photos

Serious shaping... Any language this sounds better?

img_6813.jpg

And the result. I did use templates to check how far to plane and sand. I used a plane first on 45 degrees. Thereafter 120 grit paper on a block, 180 grit on a block and 180 on a sanding swamp and finished with 240 loose in the hand. Very smooth now.

Regards, Lucas

Edited By Lucas Hofman on 14/04/2020 21:27:16

Steve Nash 114/04/2020 22:42:12
avatar
50 forum posts
11 photos

I don't think I've ever used my balsa plane so much before. I've built the Provost, now halfway through the Gnat. Got the fuselage all planed / sanded, fitted intakes and planed / sanded. Just planed the wings to profile ready for sanding. It's looking great now it is starting to take shape.

Dickw15/04/2020 10:16:47
avatar
668 forum posts
93 photos

That pile of wood shavings looks familiar - and the sanding is another legitimate use for face masks!

Dick

Lucas Hofman17/04/2020 21:20:57
665 forum posts
375 photos

When a kit has so few parts one has to build slow to make the fun last:

img_6822.jpg

Here the rib jigs from SLEC came in handy.

Lucas

Lucas Hofman17/04/2020 21:24:51
665 forum posts
375 photos

Not everyone builds as slow as I do:

93711503_10216824401577451_5445760279239458816_o.jpg

However, he has not sanded the fuselage yet and I think he is going to regret glueing the air intakes to the fuselage before sanding.

Lucas

Lucas Hofman20/04/2020 07:18:36
665 forum posts
375 photos

A few little steps further:

img_6832.jpg

By the way, has anybody made the fan removal hatch? I was thinking it may better be postponed until the fan actually needs removal.

Cheers, Lucas

John Roberts 920/04/2020 08:24:05
avatar
195 forum posts
175 photos

Hi Lucas,

I am enjoying your build blog, thanks for taking the time to post it smiley

My Gnat is a few steps behind yours. Next step is to attach the nose block and start sanding.

Keep up the good work!

John

Tim Ballinger20/04/2020 08:28:51
avatar
778 forum posts
283 photos

Lucas,

I never bothered with a fan hatch. If surgery is required so be it, I have a saw and a knife!

Tim

Lucas Hofman22/04/2020 07:07:24
665 forum posts
375 photos

Top and bottom sheeting on the intakes in place:

Lucas Hofman23/04/2020 08:04:14
665 forum posts
375 photos

It is starting to look like a jet fuselage:

img_6840.jpg

Note tape used to prevent the sanding block making scratches in the already sanded parts of the fuselage.

Cheers, Lucas

dan h23/04/2020 08:18:00
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114 forum posts
36 photos

Looking very good lucas.

Dan

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