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Author Topic: F1M build 2014  (Read 9473 times)
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Olbill
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« Reply #75 on: March 23, 2016, 01:22:51 PM »

West Baden
3/20/2016

Cat 3
21:11
13" x 1.5g 5/99
1800 turns to .97 in-oz
no backoff
260 turns remaining
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Tapio Linkosalo
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« Reply #76 on: March 23, 2016, 02:37:22 PM »

prop details? (high pitch, low pitch, transition torque)?


(Magnificent result!)
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Olbill
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« Reply #77 on: March 23, 2016, 06:05:22 PM »

I think it was about 45/28 but I'll need to measure to be sure. It starts changing pretty soon after launch.

You know how people say to make ONE change and then see how that affects the flight? That's a great idea unless you only have time for one more flight. So before the last flight I increased the stab tilt, lowered the low pitch and raised the high pitch. (and put in 60 more turns) It all worked out pretty well!

I couldn't face all the things that have to be done to file for a world record so this flight will be the new AMA record and is 10 seconds more than the current world record.
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OZPAF
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« Reply #78 on: March 23, 2016, 07:07:36 PM »

Good on you Bill.

John
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Olbill
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« Reply #79 on: March 23, 2016, 10:06:48 PM »

prop details? (high pitch, low pitch)?

49/26
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Olbill
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« Reply #80 on: March 25, 2016, 04:12:43 PM »

FWIW I'm now making 4 strand motors for LPP and F1M. The motor above was a 4 strand motor
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frash
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« Reply #81 on: March 25, 2016, 10:46:03 PM »

Olbill,

More uniform winding and unwinding due to smaller knots? Or why? Thanks and congratulations.

Fred Rash
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Olbill
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« Reply #82 on: March 26, 2016, 12:55:42 AM »

Some recent experiments point to a higher number of possible turns and/or more competition winds per motor before breaking. I think this is due to the rubber cross section being closer to square instead of more rectangular.

And of course for F1M the knot counts as part of the 1.5 gram maximum rubber weight. For a 4 strand motor the knot is 1/2 the weight that it is in a 2 strand motor.
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green-man
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One of my F1D VP propeller hubs - weight 104 mg.



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« Reply #83 on: March 28, 2016, 04:54:13 AM »

Also Bill, if a strand breaks it may not be so catastrophic.
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Olbill
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« Reply #84 on: March 28, 2016, 10:16:05 AM »

I think if you have a broken strand it will continue to output energy as long as it is trapped within the remaining strands. I'm sure the F1B guys would know all about this.
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Iridescent Wings
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« Reply #85 on: October 25, 2019, 05:44:08 PM »

Hey Y'all, I'm pretty new to F1M (Although I've built one before) but what are some good wood sizes for outlines (Wing spars and ribs, wing posts, etc.)

Also, I'm talking about an all-wood F1M since I have absolutely zero usable carbon fiber  Undecided

My last one had 1/16 by 1/32 for the spars, 1/32 square for the wingtips, and 1/32 square for the stab outlines. 1/16 square for the wing posts. All of dat is in inches BTW.

Any of those too much or too little? My last one also came out overweight because it was only later did I realize boron needed to be attached with Duco and not CA and also that the weight of the plane is determined With the propeller and not just a fuselage with wings  Tongue
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Olbill
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« Reply #86 on: October 25, 2019, 11:21:04 PM »

Here are some plans with wood sizes shown:
Attached files Thumbnail(s):
Re: F1M build 2014
Re: F1M build 2014
Re: F1M build 2014
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Tapio Linkosalo
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« Reply #87 on: October 26, 2019, 03:41:30 AM »


And this is my "course model". I've held a couple of courses where this model has been built by more than 10 people with various skills. Typically they have flown "off board" and at best made over 10 minutes with a fixed prop in 20 meter hall. Some versions have had built-up prop, others one with solid balsa sheet blades.

(The drawind should print on a A3 sheet, but I'm not sure of the scale as I had to aggressively reduce the size to meet the size limit on the forum...=
Attached files Thumbnail(s):
Re: F1M build 2014
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