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Author Topic: BMJR Tail Firster  (Read 1925 times)
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NeilH
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« Reply #25 on: December 29, 2016, 08:27:13 PM »

While the 6 x 3/32 motor has about 2/3 the torque of the 6 x 1/8, it is about 1/3 more than the 4 x 1/8.  I'm hoping it's a good compromise.

Neil
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danberry
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« Reply #26 on: December 29, 2016, 11:09:21 PM »

 :)there is one way to find out.
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DerekMc
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« Reply #27 on: December 30, 2016, 12:32:09 AM »

I've had success with 10 strands of 1/16". It works great in my Boomer.
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NeilH
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« Reply #28 on: January 02, 2017, 12:47:12 PM »

Progress has stopped while we locate and repair a water leak under our concrete and tile floor.
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NeilH
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« Reply #29 on: January 09, 2017, 03:38:50 PM »

A little more progress as time permits while looking for a source for leak detection equipment. Spending our winters in Mexico certainly has its challenges.
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Flyguy
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« Reply #30 on: January 09, 2017, 04:22:23 PM »

Looking really nice Neil! This convinces me to buy the kit, looks nice. Looking forward seeing the rest of the build and some flying, hope you get that pesky leak fixed.
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NeilH
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« Reply #31 on: January 14, 2017, 01:57:48 PM »

The bones are finished except for final sanding.  I didn't bring any dope or covering materials with me so it won't get covered until we go home in April. Now to start something new.
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NeilH
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« Reply #32 on: April 19, 2017, 02:45:01 PM »

Time for an update.  We arrived home in time to get the tax man satisfied and then on to more important things like finishing the Tail Firster.  I used one of the free wheeling latches from Volare products and it's much simpler than the one shown on the plans.  The framework and prop, etc. weighs 28 grams so it should be close to 40 grams final weight.  I have covered the fuselage with light silkspan and am using Esaki tissue on the rest.  Will post more pictures soon.

Neil
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NeilH
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« Reply #33 on: April 24, 2017, 01:06:19 AM »

Status report.  We had our 4 year old great-granddaughter for the last 3 days so we were very busy but nothing got done.  I did get a couple of status pictures attached.  One shows the fuselage and front wing covered and finished and the main wing half covered.  The second shows the prop and drive shaft with the Volare Products free wheeling latch.  Mush simpler than the system shown on the plans and also allows for changing props.  Hope to finish covering this week.  Then rig the d/t.
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NeilH
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« Reply #34 on: May 03, 2017, 11:31:30 PM »

Finally have it completed.  39.7 grams ready to fly. Have not balanced with a motor so may have to add ballast.  Messed up some of the tissue so will have to do some patching in spots that came out wrinkled.  Pictures to follow.
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NeilH
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« Reply #35 on: May 04, 2017, 03:43:03 PM »

OK, here it is.  Nothing fancy but at 39.7 grams I'm hoping for decent performance.
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danberry
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« Reply #36 on: May 04, 2017, 06:06:30 PM »

It will do fine.
How does it DT?
I don't see any address labels.
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NeilH
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« Reply #37 on: May 04, 2017, 06:31:03 PM »

The address label is the small white patch on the fuselage in front of the aft wing.  The d/t will pop up the trailing edge of the aft wing, similar to a pop up tail.  I think that should be more effective than a pop up tail.  However, if that doesn't work then I will have to figure out some way to make a pop off wing.
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danberry
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« Reply #38 on: May 04, 2017, 06:36:36 PM »

Ah. I put labels on all 3 pieces.
A fuse in the wing right where your rubbers are hooked will burn through a rubber band and ----voila!--- the wing comes off.
I'm thinking that you will get a flat-spin helicopter event with the wing popped up. If it does that it will be a slow descent.
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NeilH
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« Reply #39 on: May 05, 2017, 12:47:26 PM »

With a pop up tail on a conventional configuration, the cg is below the wing so when the tail pops up the model comes down with the wing and body flat.  My assumption is with the cg ahead of the main wing it will be at some negative angle as well as the forward body and forward wing at a positive angle, hopefully coming down faster.
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NeilH
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« Reply #40 on: May 29, 2017, 04:54:41 PM »

Well, after about a half dozen trimming  flights the Tail Firster is looking pretty good.  I've added 1.1 grams of ballast to the nose to get the cg where it belongs and a 1/16th shim under the trailing edge of the main wing.  41.4 grams all up less rubber.  A slight tilt to the front wing gives nice right circles in power and glide.  With 600 turns on a 6x1/8x20 motor it climbs very steeply and transitions into a nice glide.  Almost lost it into the trees surrounding our small field but at the last minute it turned away and returned.  Next time I'll try a 6x3/32x26 motor for comparison.

Neil
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