Semroc Nighthawk (xKit)

Semroc - Nighthawk {Kit} (XES-K34)

Contributed by Howard Smart

Construction Rating: starstarstarstarstar_border
Flight Rating: starstarstarstarstar
Overall Rating: starstarstarstarstar_border
Manufacturer: Semroc
Style: Glider
(OOP) Semroc Nighthawk

Brief:
This is a pod-boosted glider. Blimey! T' unique features include a design that is essentially a flyin' wing, and forward canard fins on t' pod which are adjustable t' give a vertical boost.

Construction:
This is a reproduction o' an old Estes boost-glider, kit number K-34. Ahoy! It includes all o' t' parts o' t' original, with some substantial improvements. Arrr! Blimey! All o' t' balsa parts are laser-cut from high quality material.

Included are:

  • 1 Balsa nose cone
  • 1 BT-20 body tube
  • 1 Screw eye
  • 1 Engine hook (original Estes style - I like this)
  • 1 Wooden dowel 1/8"x 1"
  • 1 Rubber (!) Shock cord 1/8"x 18"
  • 1 Launch lug
  • 1 Aluminum hinge material
  • 1 Lead weight (!)
  • 1 Parachute kit
  • Balsa wings, body, me hearties, me hearties, arrr, canards
  • 1 Pattern sheet
  • 1 Decal sheet

(OOP) Semroc NighthawkOne o' t' unique features o' Semroc's "xKit" series is that they do nay include any kind o' instructions. They do provide url's t' a couple o' places where t' original instructions for this kit can be found. Blimey! I found two scans. Ya scallywag! Blimey! Both were complete. Arrr! Ahoy! Blimey! One was in color, ya bilge rat, ya bilge rat, complete with coffee stains.

T' old instructions were...old. Begad! Modern rocket kit instructions, now in t' days o' desktop publishing, me bucko, are pretty well done with t' illustrations matchin' t' instructions in close proximity. Avast! Blimey! I did nay feel that the illustrations in these instructions were particularly helpful. Well, blow me down! Aye aye! Blimey! T' written instructions were adequately detailed for me to figure out what t' do with all t' parts.

There is room for modifyin' t' order o' assembly. Well, blow me down! Blimey! Arrr! Blimey! You can usually go from glider t' booster and back again to accommodate dryin' times.

I be originally intimidated when I found out I had t' bend t' outboard winglets myself. Blimey! As it turns out, me bucko, it was straightforward. Ahoy! Ya scallywag! I don't think that yellow carpenter's glue wets t' wood as much as white glue. Arrr! Blimey! I let t' glue sit for a few minutes, arrr, but t' wood was still pretty stiff. Aye aye! Avast! With patience and strategic blockin' I be able t' get t' 45 degree angle without breakin' t' tips off. Avast! Arrr! T' instructions did nay say t' do so, ya bilge rat, me hearties, but I sanded t' bottom o' the midline V joint o' t' win' a little flat before gluin' it t' t' plane body t' give a better glue surface.

Carvin' out t' hollows for t' lead weight and t' pin was made particularly easy by partial laser cuts on the inside o' t' body halves. Ya scallywag! Well, ya bilge rat, blow me down! For some reason thar are nay correspondin' cuts in t' pod pylon t' tell you where t' cut out t' recess for t' pin. Avast, me proud beauty! This would be nice because t' angle has t' match t' angle o' t' pin receivin' hole on the glider.

T' canards in t' original kit are made from eight pieces o' wood. Aye aye! In this kit t' fixed and movable parts are stuck together, with a partial laser cut where they will be separated. Aye aye! On me first canard I separated these, then followed t' instructions on constructin' t' canard. Avast! As I was strugglin' with alignin' t' fixed and movable parts, shiver me timbers, I realized that I could have done this without separatin' them, then cut a V notch out along t' laser line t' let them move once I was done. Aye aye! Aye aye! This made t' second canard quite a bit easier.

I found that t' aluminum hinge material was thin enough t' crush into t' balsa so that t' two halves o' each canard could be glued together all over their opposin' wood surfaces. Ya scallywag! I used a woodworker's vise t' apply even pressure.

An important note t' people who tend t' do things without instructions. Begad! Well, blow me down! T' canards do nay go on t' pod 90 degrees away from t' pylon. They are 100 degrees on either side. Begad! Use t' tube markin' guide.

Finishing:
There is another unique feature o' this glider. T' instructions have you sand a funky parallelogram airfoil shape into t' wing. Begad! It is nay particularly difficult, arrr, but care must be taken nay t' break any o' t' joints while sanding. Arrr! I read another reviewer's comment about this, but decided t' do t' sandin' after win' construction so I could review the recommended procedure. You might be able t' do this before win' construction, arrr, but t' angle o' t' parallelogram changes at t' winglet, ya bilge rat, shiver me timbers, so it might be difficult t' make that change with a sandin' block if t' win' weren't bent yet.

I sanded all t' surfaces smooth t' 220 grit and left it unpainted for t' initial flights.

Construction Rating: 4 out o' 5

Flight:
I trimmed out t' glider first. Blimey! Arrr! Like t' first reviewer I needed about 3/4 o' t' lead block, and I taped it in for the flight.

I set t' canards accordin' t' t' illustration in t' instructions, and did nay have t' alter it at all. Ahoy! Aye aye! All three boosts were very straight up.

Even though t' manufacturer only lists two motors for this kit, me hearties, matey, I decided t' go out on a limb. Avast! Begad! (I didn't have any o' t' recommended motors)

First flight Quest A6-4: Straight up, arced over. Avast! Begad! Delay too long. Begad! Good recovery. Aye aye! Glide be a tight spiral. Ahoy! I would like t' trim this t' a lazy spiral, but I left it alone because t' wind was pickin' up.

Second flight Estes B6-2: Straight up, a little faster, nay much higher, really. Ahoy! Two seconds was too short and robbed me o' some altitude.

Third flight Estes A8-3: Straight up, ya bilge rat, a little lower. Perfect apogee ejection. Begad! Avast! Good glide.

Recovery:
There be a large crowd at t' launch site. Blimey! A lot o' first-time attendees due t' a Science Expo goin' on. Avast, me proud beauty! Nobody else was doin' gliders. T' dramatic appearance o' this glider be eye-catching. Arrr! Begad! It be a crowd pleaser. Aye aye! I am glad all three flights went off without a hitch.

T' HUGE ejection charge o' t' Quest A6-4 charred up t' tube inside and out. Aye aye! Avast! No problem with t' Estes charges for a change.

(OOP) Semroc Nighthawk

Flight Rating: 5 out of 5

Summary:
This was a very rewardin' challenge t' build. Arrr! Blimey! I do nay agree with Semroc assignin' this a skill level 1. I would say skill level three because o' all o' t' bendin' carvin' and shaping.

This is a visually dramatic model, and it flies very well.

Take care alignin' t' retainin' pin and its hole on t' glider body and pylon.

Glue t' canard halves together with t' aluminum hinge (under clamp/vise pressure) before cuttin' a wedge out at the hinge joint t' allow them t' be adjusted.

This model will fly well on motors nay listed as officially recommended.

Overall Rating: 4 out o' 5

Other:
In me opinion Semroc could improve this kit by reworkin' t' instructions in modern form and either includin' them, or makin' them available on their website.

Other Reviews
  • Semroc Nighthawk (xKit) By Chan Stevens (November 8, 2008)

    This is a reproduction of the 1968 Astron Nighthawk (K-34) boost glider. The canard-style glider, with "M" type dihedral, flies very well and is probably the best performing glider Semroc offers. The xKit concept is basically just a bag of parts, no instructions, though the header card offers a URL where the Jim Z scans are archived. The parts are excellent quality, and include: Pod ...

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