JETSTREAM A-1 (F-1H)

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Expand view Topic review: JETSTREAM A-1 (F-1H)

Re: JETSTREAM A-1 (F-1H)

Post by staubkorb » Sun Oct 31, 2021 5:50 pm

I finally got all the electriky parts sorted and all the lines for the DT/rudder trimmed. I DID have to change the servo output cut-out to the top 'cause the timer had no way to reverse the servo - actually better as it moves the DT line out of the way making launching easier - one can see in the photo in the previous post that the servo arm opening is at the bottom. The model, ballasted to the plan CG is right at 160 grams.

I have not been able to get out to the field, mostly due to getting my car ship-shape for the inspection and repairing some minor niggles, but the wind has not been very co-operative either and it's getting downright cold. Two evenings ago, I was able to get in a few hand tosses in my back yard which showed a marked tendency to dive. Removed some weight out of the nose, but it still seemed nose heavy. Incidence is per plan, so I might remove a bit more lead and/or shim up the stab TE once I get to the field for more conclusive observations.

The timer from Den's works a charm and will order a few more, but I would still like to get a couple of band-burners from a site in GB that I was recently made aware of.

Re: JETSTREAM A-1 (F-1H)

Post by staubkorb » Mon Jul 12, 2021 5:29 pm

Finally getting into the home stretch with this puppy. Got the covering done - tho NOT quite to my liking :x . JAPICO tissue is fairly light - not much heavier than ESAKI - but has VERY little shrink and no wet strength, with yellow having next to none. After three full soak tries on the stab, the result is only mediocre. I'll have to use shrinking dope (fortunately, I have a liter) to try and get a decent finish - and then comes the wing...

Another negative to JAPICO is that it requires a LOT more dope to seal! I should have bitten the bullet and ordered some of the "new" tissue...

The color separations will be getting a pinstripe to hide irregularities and to give the joins a bit more strength. A bit of white paint on the fin/rudder, remounting of the D/T bits, and final dope coats and it's done.
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Re: JETSTREAM A-1 (F-1H)

Post by staubkorb » Mon Jun 21, 2021 12:42 pm

I just had to scratch an OLD itch building this bird. It will probably never be competitive, even in the newer"entry" class here in Germany, but it is, to me at least, still one of the prettiest A1's ever designed. It is eligible for the A-1 Postal on Hippocket, at least and will not be alone as there is another being build by one of the members there.

Strange thing. Today, I had to reset my password even tho it worked fine the last time I logged in a few days ago :!: :?:

Re: JETSTREAM A-1 (F-1H)

Post by Site Admin (Dave) » Fri Jun 18, 2021 11:21 am

Nice build! I used to love gliders in the way back then days! :)

Re: JETSTREAM A-1 (F-1H)

Post by staubkorb » Sun Jun 13, 2021 4:00 pm

I've gotten quite a bit done and posted on our sister sites, but somehow ran out of energy/time to update here :oops: .

Construction is complete and I'm nearly done with covering and getting the DT system sorted. As I've determined that the model will need approximately 30 grams in the schautze, I had originally planned to use a Graupner scroll type timer, but the physical size was too much and the cut-out would have compromised the fuselage integrity. I ended up ordering an electronic unit from Dens Model Supplies in England that uses a nano-servo for actuation - the complete set-up weighs less than 10 grams (depending on servo and battery choice).

The colors I've decided on follow the same scheme as my SENATOR and I'll be using this scheme on all my "duration" models.
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Bottom of wing nearly covered
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DT System covers
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Nano-servo on mounting plate
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Tow hook anchor
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stab
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Re: JETSTREAM A-1 (F-1H)

Post by staubkorb » Tue Apr 13, 2021 9:37 am

Wingtips have been framed out and sheeted. Started shaping the wing center section LE after getting the sheeting done.

The gizmo on the wing is the electronic timer that I'll be using - haven't unearthed the sub-micro servo out of my stash yet. Weight of the total DT system (timer, towline switch, LiPo battery and servo) is less than the lightest clockwork timer that I have, and the installation will leave the airframe MUCH cleaner.

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Frame-up of right wing tip
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Right wing tip framed up and ready for LE sheeting
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Wing center section ad timer
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Re: JETSTREAM A-1 (F-1H)

Post by staubkorb » Mon Apr 12, 2021 12:59 pm

Wing center section framed up and a quick lash-up of the parts.
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Re: JETSTREAM A-1 (F-1H)

Post by staubkorb » Mon Apr 12, 2021 12:57 pm

Getting the Stab done.
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Re: JETSTREAM A-1 (F-1H)

Post by staubkorb » Mon Apr 12, 2021 12:56 pm

In the previous photos, the timers shown are scroll clockwork types. I was originally hoping to use the Graupner one as it has never been used, but it is physically too large. The others would be OK except that they are OLD, used and 3-function. The weight difference between the clockwork timers and the electric one - with the servo and battery - is still lighter than the lightest clockwork one (even tho the extra weight is not an issue).

Re: JETSTREAM A-1 (F-1H)

Post by staubkorb » Mon Apr 12, 2021 12:48 pm

Some detail of the ballast hatch, which is where I'll mount the electronic timer and battery. There is plenty of room for the extra lead (needed!).
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