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Building the Clark Spitfire IX

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Building the Clark Spitfire IX

Old 09-26-2020, 03:52 PM
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CarreraGTSCS
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Originally Posted by Chad Veich
My opinion only, 41-44 pounds for a 1/4 scale Spitfire is well within reason and will fly just fine assuming adequate power to pull it around. Again my opinion only, but a 30-35 pound 1/4 scale Spitfire would be a sailplane. I'm sure it would be fun to fly in calm conditions but in any wind I would prefer more wing loading than that would provide.

The previous owner dropped the Spitfire off to me earlier this week and I'm very excited. I'm thinking that with 20-30 hours of work it will be ready to fly. I was considering electric but really, it isn't feasible for the kind of flying that one would do with a warbird like this. Even the best combination of motor/battery/prop would only give 3 or 4 minutes of WOT with a few minutes of tootling around the pattern. Putting in enough battery capacity to double the flight time would give me a 50 lb model. I've decided on something like a DA-100i inline twin. It weighs a bit under 7.5 lbs with the ignition module. Probably right around 9-10 lbs with prop, spinner and fuel and that adds up to 44 lbs +- a bit.
Old 09-28-2020, 11:40 AM
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Default DA or 3W?

I started a conversation on Flying Giants about the merits of the DA 100 vs the DLA 116. After a number of responses with great information I'm down to either the DA 100 or possibly a 3W 150 (if I can find one).

Does anyone know the weight of the Clark Merlin 1/2 engine. The 3W 150 weighs a few pounds more than the DA 100. If the 3W will fit its a big jump in power with a scale size 3-blade prop.
Old 10-03-2020, 07:40 AM
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Looking for something the other day I realized that I had a Rimfire 65 not being used. I ran the numbers and on 12s 10,000 mah it gives 1:1 power, 86 mph, over 5000 watts and good flight times. The numbers are just about perfect. I'm going to try an electric set up after all and see how it goes.
Old 10-03-2020, 10:09 AM
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Originally Posted by CarreraGTSCS
I started a conversation on Flying Giants about the merits of the DA 100 vs the DLA 116. After a number of responses with great information I'm down to either the DA 100 or possibly a 3W 150 (if I can find one).

Does anyone know the weight of the Clark Merlin 1/2 engine. The 3W 150 weighs a few pounds more than the DA 100. If the 3W will fit its a big jump in power with a scale size 3-blade prop.
IAW this 2007 post # 3 below, the Clark Merlin engine weight was approximately 13lbs.

Building the Clark Spitfire IX

I am building the spitfire for a friend in fla. The kit came with the latest engine. I am not impressed with it. It weighs around 13lbs. The problem is it would have to have lead to replace any reduction. I would have preferred either a 3w or ZDZ but the choice was not mine.
tr
Old 10-03-2020, 10:56 AM
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Originally Posted by ForcesR
IAW this 2007 post # 3 below, the Clark Merlin engine weight was approximately 13lbs.

Building the Clark Spitfire IX

I am building the spitfire for a friend in fla. The kit came with the latest engine. I am not impressed with it. It weighs around 13lbs. The problem is it would have to have lead to replace any reduction. I would have preferred either a 3w or ZDZ but the choice was not mine.
tr
That's twice the weight of a DA-100. Can you compare the size to something like a 3W-150?
Old 10-03-2020, 01:00 PM
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The 3W-150 weighs just over 10lbs, see attached link.

3W-150iR2 Inline Twin
Old 02-17-2022, 07:59 PM
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Default Electric Power!!

The electric power for my Clark Spitfire arrived today. It's a StinGR 170. 12s 22,000mah, 300amp Scorpion Tribunus II esc, 30x12 Falcon C2E or JC Superprop 28x14.





Old 04-21-2024, 11:43 AM
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Findgareth
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I’m building a FokkeRC Spitfire MkIX (1/5 scale). It’s designed for gas but I wanted to go the electric route instead, and decided on the StinGR option. Yes plenty of woodwork and some anxiety cutting off the original firewall and building new structure for electric power. Once I was able to give Jim Kitt the model weight, prop dia (24 - 25” 4-blade) and my performance needs he recommended the StinGR120/Tribunus 200 running on 12S and turning a 24x12x4. Jim was great to work with. Some work left before flying but I was impressed with the power plant.

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