Block off the intake of the cowl other where the cylinder is, if your really looking for it to haul.
Looks cool with that pipe hanging off the back! |
I think it will be slower than the 45 sized one lol
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If it can spin that prop about 13k in the air, may be faster than the 7.5? But that would be a trick I think. No doubt it will move along. I'd make a SWAG of 140 - 145 on that prop, but I could be all wet.
Where is peak power made on that engine I wonder? |
what I am getting at is the weight.
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Originally Posted by MJD
(Post 12050835)
If it can spin that prop about 13k in the air, may be faster than the 7.5? But that would be a trick I think. No doubt it will move along. I'd make a SWAG of 140 - 145 on that prop, but I could be all wet.
Where is peak power made on that engine I wonder? |
The only reason i went with the webra.61 instead of the k&b 7.5 is because the p47 has a big firewall and i wanted to get more prop out side of the cowl. I could be wrong and this not work but i gotta try it. This webra was in the electric gp proud bird i built 2 the first one broke the wing and the second on the first flight it started moving so fast it flutter the wing and striped the ale servo. Stupid me did not go with metal gear. Oh well live and learn.
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2 Attachment(s)
http://www.rcuniverse.com/forum/atta...mentid=2100841http://www.rcuniverse.com/forum/atta...mentid=2100842here is the gp.25 sized spitfire
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Cool! I snagged a couple of RIRE 7.5's 2-3 years back, in the classifieds, but haven't done anything with them yet. I think I can wedge one into a .25 delta though.
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The GP Spit looks good I have a OS FX with header and pipe could do the same side mount set up. Did you have any trouble with the balance with the K&B 7.5 on the nose?
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Originally Posted by MJD
(Post 12051027)
Cool! I snagged a couple of RIRE 7.5's 2-3 years back, in the classifieds, but haven't done anything with them yet. I think I can wedge one into a .25 delta though.
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Originally Posted by Pond Skipper
(Post 12051062)
The GP Spit looks good I have a OS FX with header and pipe could do the same side mount set up. Did you have any trouble with the balance with the K&B 7.5 on the nose?
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Originally Posted by crazyflyer92
(Post 12051022)
http://www.rcuniverse.com/forum/atta...mentid=2100841http://www.rcuniverse.com/forum/atta...mentid=2100842here is the gp.25 sized spitfire
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I had the Spitfire several years ago with a piped OS 32F in it. Radar'd it at a bit over 130, but you could hear aileron flutter on every pass. Couldn't prevent the flutter/buzzing, so I gave up and put a .25FX on it.
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Originally Posted by rcguy59
(Post 12051238)
I had the Spitfire several years ago with a piped OS 32F in it. Radar'd it at a bit over 130, but you could hear aileron flutter on every pass. Couldn't prevent the flutter/buzzing, so I gave up and put a .25FX on it.
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Originally Posted by Axle Al
(Post 12051237)
yeah I see that little pee wee spitfire!#! I got a moki 1.35 on a phoenix genesis/relentless that will smoke that that little whinny .45............. Big Block!#!#! Kaa-Powwwwwww......winner!!!!
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Originally Posted by airraptor
(Post 12050739)
I think it will be slower than the 45 sized one lol
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Originally Posted by Axle Al
(Post 12051268)
yeah that's right. Didn't the germans use webra's in ww2, the reason they lost LOL Kaa-Pow!
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1 Attachment(s)
RCGuy59 how was the speed with the 25FX, was it piped if so what prop combo did you settle with?
I have the header cut at 4.25" and will tune from there. http://www.rcuniverse.com/forum/atta...mentid=2101305 |
The 25FX wasn't piped, just the standard OS muffler. It was still very fast with the .25, but not enough to make the ailerons or elevators buzz. That was the idea behind the .25 in the first place, to only slow it down a bit.
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Would there be enough roll control to use the flaps like ailerons and fix the original ailerons so they are stationary..?.
The "deal breaker" is if there isn't enough roll control to deal with a cross wind, or at landing speed. |
It doesn't have flaps, Chuck. Mine didn't handle very well at low speeds. All it did well was go fast.
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The stock GP spitefire with stock OS 25FX and 9x6 prop will hit right at 100 mph straight and level. for a piped 25 FX the 8x7 will be a good prop and should be in the 17,000 range. The spit if properly built up will run right around 180 with a Nelson in it. Stock elevator is only good for around 130 or so and beyond that cant turn hard or it will shear off. Solid tail and then glasses with 1.5 ounce cloth works well
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Great info thank you Air Raptor, good job I cut the header at 4.25 " I will be very close with a APC 8x7 might try a 7x8 good for around 125 -130.
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Originally Posted by airraptor
(Post 12052152)
The stock GP spitefire with stock OS 25FX and 9x6 prop will hit right at 100 mph straight and level. for a piped 25 FX the 8x7 will be a good prop and should be in the 17,000 range. The spit if properly built up will run right around 180 with a Nelson in it. Stock elevator is only good for around 130 or so and beyond that cant turn hard or it will shear off. Solid tail and then glasses with 1.5 ounce cloth works well
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