Search: Posts Made By: peterboshoff
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Forum: Aerodynamics
07-06-2008, 07:09 PM
Replies: 6
Views: 3,934
Posted By peterboshoff

Flat bottommed airfoil.

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Another problem with flat bottommed airfoils even with rounded LE is the negative pitching moment - but can any one explain to me how to...
Forum: Power Systems
05-20-2008, 01:25 PM
Replies: 324
Views: 120,239
Posted By peterboshoff

If you have a 5lb plane and are using a motor...

If you have a 5lb plane and are using a motor with 5lb of thrust, you are way over powered for some planes and under powered for others. Ed[/quote]
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Forum: Power Systems
05-19-2008, 10:35 AM
Replies: 324
Views: 120,239
Posted By peterboshoff

Watts and Thrust

[quote=mred;391897]I think that 1hp is around 750W, not 450W, so if your motor is putting out 500 Watts, you should have around .66hp unless ...
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Watts /pound or...
04-02-2008, 07:20 PM
Replies: 23
Views: 4,380
Posted By peterboshoff

***************************************** You...

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You seem to be bored - if it was due to my posting, I apologise for using Watt Flyer Forum, which will be a pity as I enjoyed some of the items.
I am...
04-02-2008, 07:03 PM
Replies: 23
Views: 4,380
Posted By peterboshoff

Thanks for reminding me that I should use another...

Thanks for reminding me that I should use another forum:blah:
03-31-2008, 01:20 PM
Replies: 23
Views: 4,380
Posted By peterboshoff

************************************** I...

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I changed the propeller to a 0.25gm 4027 carbon fibre prop giving me 21 gm thrust in stead of 28 gm and no more turning to the left. The revs on the prop was...
03-29-2008, 05:33 PM
Replies: 23
Views: 4,380
Posted By peterboshoff

[quote=Bill G;383990]Where to start with...

[quote=Bill G;383990]Where to start with “scratch” builds?

That's a good question.
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I have been playing around with figures and came up with the...
03-28-2008, 04:57 PM
Replies: 23
Views: 4,380
Posted By peterboshoff

[quote=John Boy;291130]Accept for a hotwire...

[quote=John Boy;291130]Accept for a hotwire cutter and board, I have all the tools. I also have most of the glue and other items from putting home repair, **********************
I am scratch...
Forum: Power Systems
01-25-2008, 11:15 AM
Replies: 26
Views: 3,611
Posted By peterboshoff

Angry ESC not working

[quote=d&mrc;336075]I have a foamy that I have been slowly putting together. A few days ago, I was finally ready to finish her up. I installed the motor and the esc, and, impatient to see it "roar to...
Forum: Power Systems
01-22-2008, 06:29 PM
Replies: 324
Views: 120,239
Posted By peterboshoff

I am starting the other way round. I have an...

I am starting the other way round.
I have an EMAX 4030-10 brushless motor (5000gm thrust) with an ELF HOBBY 100A Brushless controller and a 5000 mAh 5 cell Lipo battery - but it don't want to work -...
Replies: 144
Views: 11,761
Posted By peterboshoff

*********************** Thank you very much for...

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Thank you very much for the info - it does answer my querie - the bunch on ebay surely do not know what they are talking about, trying to sell me a transmitter with out any...
Replies: 144
Views: 11,761
Posted By peterboshoff

********************** Thanks for your reply ...

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Thanks for your reply
The reason for my believe is on the last page of the Futaba manual, which say "Should you ever wish to change the transmitters frequency, the...
Replies: 144
Views: 11,761
Posted By peterboshoff

Transmitter frequency fixed to one frequency

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Likewise, but as far as I can make it out the transmitter frequency is fixed - you can change Rx frequencies to match the transmitter but not the other way round. If I am...
10-24-2007, 09:42 AM
Replies: 954
Views: 62,504
Posted By peterboshoff

Cool Great to fly choppers - shrink your head to normal.

Great to fly choppers - shrink your head to normal..
08-15-2007, 08:21 AM
Replies: 1,072
Views: 67,649
Posted By peterboshoff

Thumbs down [quote=admin;243332]Wattflyer Contest Begins...

[quote=admin;243332]Wattflyer Contest Begins right now and ends August 31, 2007. Sponsored by Horizon Hobby (http://www.horizonhobby.com) and ParkZone (http://www.parkzone.com).

quote]
The...
08-10-2007, 11:14 AM
Replies: 16
Views: 2,638
Posted By peterboshoff

Cool Balancing

[quote=Matt Kirsch;242863]Don J.,

Part of the problem is that it's spelled "balancing," without the extra E. :D :D :D

Frankly, you don't need any fancy contraptions to balance most planes....
08-10-2007, 11:05 AM
Replies: 16
Views: 2,638
Posted By peterboshoff

By working it out with momentum around where the...

By working it out with momentum around where the centre of gravity should be, it is amasing how a small weight on the tail multiplied by the distance to the COG work out to a much larger weight at a...
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