Glow to Electric Conversions Discuss glow/gas conversion to electric here.

Sig Kougar conversion

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Old 09-22-2004, 06:33 PM
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jonnyjetprop
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Default Sig Kougar conversion

I'm converting a Sig Kougar from glow to electric. The plane is 6 years old and had not flown for two years as I started flying electrics only. The goal was to mimic the glow performance while keeping the weight in check. I wanted to use as much stuff that I had on hand to reduce expenses. Spurred on by comments that it would be too heavy, I pressed on.

I started by stripping all the glow componnents out of the airframe and mounting the electric motor. I decided to use the glow mount beams and a set of clamshell mounts from MPI to mount the motor. A large hole was cut in the firewall to allow access and airflow.

John
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Old 09-22-2004, 06:35 PM
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Default RE: Sig Kougar conversion

In order to mount the battery pack, I cut out part of the front former to allow the battery to lay flat on the top of the fuse using velcro to mount it.
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Old 09-22-2004, 06:50 PM
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Default RE: Sig Kougar conversion

To give you an idea of the weight, I'll give you a table of weights.

Kougar before conversion (excluding receiver battery, fuel tank empty)

92 ozs.

Items removed:

.46 engine 15 3/4 oz.
Fuel tank 2 oz.
Throttle servo 1 3/4 oz.
Foam 2 3/4 oz.
prop/spinner 2 1/4 oz.
Old receiver 1 3/8 oz.

Total weight removed 25 7/8 oz.


Items added:

Jeti Phasor 30-3, Jeti 40p esc, prop, spinner, clamshell mounts 12 1/4 oz.
Hitec Elecrton receiver 1/2 oz.
325 mah receiver battery, switch harness 2 oz.

Total weight added: 14 3/4 oz.

Weight budget for flight battery: 11 1/8 oz.

Possible Batteries:

TP 3s4p gen 1 16 3/4 oz.
TP 3s3p gen 2 14 oz.
(2) TP 3s 2100 gen 2 10 5/8 oz.

John
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Old 09-22-2004, 07:03 PM
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Default RE: Sig Kougar conversion

Testing four prop/battery combos were tested and three were flown:

Phasor 30-3
APC 11x5.5
TP 3s4p gen 1 pack
42 A
10.5 V
435 Watts
9800 rpm
71.8 watts/lbs

Although it flew, the speed was low andperformance suffered.

Phasor 30-3
APC 10x7
TP 3s4p gen 1 pack
10.5 V
35 A
375 watts
(no rpm- tach battery died)
61.9 watts/lbs

Flew much better but required 3/4 power and tended to flop out of loops. Model seemed heavy.

Phasor 30-3
APC 10x7
TP 3s3p gen 2 pack
10.3 V
37 A
63.8 watts/lbs.

Flew even better and I flew the model for 12-15 mins. Equal to a .40 size motor but I still want more.


Phasor 30-3
APC 11x5.5
TP 3s3p gen 2 pack
10.6 V
43 A
74.2 watts/lbs

Didn't fly due to stripped nylon bolt but this is pushing the phasor motor which is listed as a max continuous amperage of 35.
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Old 09-22-2004, 07:13 PM
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Default RE: Sig Kougar conversion

Wanting more power, I decided to ditch to Jeti Phasor 30-3 and went with a Mega Motors 22/30/4 and a Castle Creations phoenix 60 esc. The battery is a TP 4s3p gen 2 pack.

Here are the changes in weights

Removed Phasor/ added mega 22/30/4 0 change
Removed Jeti 40p/ added phoenix 60 +1/2 oz.

In addition, I replaced to heavy standard Dubro tires with lighter Dave Brown foam tires. Weight change -2 1/4 oz.

This brings the empty weight to a touch over 79 oz.

The battery pack weighs 19 1/2 oz.

Total flying weight is 99 ozs. (6 lbs. 3 oz.)
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Old 09-22-2004, 07:16 PM
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Default RE: Sig Kougar conversion

Although I haven't flown to plane due to high winds, here are some performance numbers:

Mega 22/30/4
APC 12x6
14.0 V
46.5 A
631 watts
8700 rpm
102 watts/lbs.


Mega 22/30/4
APC 11x7
14.1 V
45 A
624 watts
9200 rpm
101 watts/lbs.
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Old 09-23-2004, 07:14 PM
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Default RE: Sig Kougar conversion

I flew the Kougar three times today. It flew great with my preference being the 12x6 prop. I may try a 12x8 prop in the future.

John
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