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Old Jan 03, 2009, 03:28 PM
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Memphis, TN
Joined Jul 2006
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Sig Bf-109

I recently purchased a Sig BF-109 and was really in the mood to create a very high performance warbird. The only builds I have seen on this particular bird have been fairly tame, 500-600 watt power trains.

I decided to set mine up for bungee launching and belly landing as this would ensure very clean aerodynamics and light weight.

This kit is of excellent quality and the wing comes pre-joined, so there is very little to do but the basic assembly. The only downsides to the kit are the scale spinner. It blew up on me the first time I ran the prop above 10,000 rpm . OK, maybe I shouldn't have expected it to live at higher speeds, but I think Sig needs to address the issue with a better spinner in the kit. In their defense though, I contacted their customer service and told them of the problem and they promptly sent me one of their gasser spinners at no cost..... So A+++ for Sig's customer service! The spinner's not very scale, but it will get me in the air until I make a custom one.

THE COMBINATION:

Airframe Specifications
Wing Span: 48 in.
Wing Area: 396 in²
Length: 42.5 in.
Flying Weight: 64 oz AUW
Wing Loading: 23.3 oz./ft²

Powertrain
Medusa 28-56-1900 V2 motor
MEC Super Box 4 to 1 ratio
Castle Creations 45HV ESC
8S, 2200 mah lipo flight pack (2 qty. 4S, 2200mah)
APC 10 x 7 prop
13,600 prop rpm, 90.2 mph pitch speed
1250 watts (30.5 volts @ 41 amps)
312 watts per pound

The maiden went well with the exception of some issues with the bungee hook location causing some instability on launch, but I am getting that all sorted out, so nothing major.

Performance of the plane is nothing short of incredible. I purposely put a lower pitch speed prop on the plane to keep everything tame for the initial flights. The "tractor" prop results in a plane that accelerates in the vertical until it becomes a spec. I will get the Eagletree on the plane soon to verify, but in it's present configuration it appears to easily hit 90 mph once the prop unloads at speed. I have a 9 x 9 prop ready to go on the plane that has a pitch speed of 115.9 mph, so I think that will be a better balance of thrust to speed ratio.

Enjoy!

Matt

.
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Last edited by niner555; Jan 03, 2009 at 03:37 PM.
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Old Jan 03, 2009, 09:29 PM
Keep calm and don't blink
KiwiKid's Avatar
Hamilton, New Zealand
Joined Jun 2005
2,022 Posts
That looks fabulous Matt. NO more models till you get a video camera

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Old Jan 03, 2009, 09:44 PM
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United States, WA, Tacoma
Joined Dec 2008
107 Posts
nice scoop man! like the functionality of it...
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Old Jan 03, 2009, 10:45 PM
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Memphis, TN
Joined Jul 2006
245 Posts
Quote:
Originally Posted by KiwiKid
That looks fabulous Matt. NO more models till you get a video camera

KiwiKid
Thanks! How's the A4 flying? Mine is currently mothballed until it gets fitted for a lightweight 4S combination.

I know, I know, I really need to invest in a video camera. The wife actually mentioned getting one to record family gatherings like Christmas, etc. I of course wholeheartedly agreed with her ...... Now we just need to save up some funds and decide on which one to get?
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Old Mar 04, 2009, 08:35 PM
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KOMET 44's Avatar
Southington, Connecticut, United States
Joined Jun 2000
2,951 Posts
Matt,Me it looks nice.I wonder if sig had designed the airframe to take all that power?
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Old Mar 14, 2009, 02:58 PM
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Memphis, TN
Joined Jul 2006
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Quote:
Originally Posted by KOMET 44
Matt,Me it looks nice.I wonder if sig had designed the airframe to take all that power?
KOMET44
I have no idea but so far, the plane has been holding up perfectly.

Matt
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