GSP Zero
09-03-2004, 02:43 AM
#126
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RE: GSP Zero
I agree with Dragonheart. Moki 180's etc are more suited to Giant Scale stuff, which this model is not.
A Super Tigre G2300 (1.40) is probably the biggest 2 stroke I would consider for this model.
Why not consider the bigger GSP Zero (96 inch winspan) for the 3 cylinder Saito?
A Super Tigre G2300 (1.40) is probably the biggest 2 stroke I would consider for this model.
Why not consider the bigger GSP Zero (96 inch winspan) for the 3 cylinder Saito?
09-03-2004, 08:24 AM
#127
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RE: GSP Zero
Woody 51
I checked final CG with APC 15x8 prop and a 3" TrueTurn p-51 spinner on the Laser 120. It stayed the same. About 2 oz of lead with the 5 cell battery pack and glow driver up front opposite the engine. Hopefully I will get it to the field Sunday and setup the engine. I used different hardware and carbon rods. I enclosed the wheel wells with 1/64 ply and added a baffle to the cowl. I drilled holes in the cowl ring for extra hot air outlet. Dave Platt recommends a OS 108 for his 79" 15 pound Zero (I saw one of these with a Saito 170 power in it) which will be on my building board next. I entend to add details to the Platt Zero so the weight will probably be in the 19 pound range and I have a OS 160 fx which will probably give more power than needed. I will post some pics and coment about flying later.
The Laser 100 is taller and the cowl will have to be cut. That is something I try hard to avoid. Personaly I think a 2 stroke 90 should be more than enough unless a rocket is desired.
Carl
I checked final CG with APC 15x8 prop and a 3" TrueTurn p-51 spinner on the Laser 120. It stayed the same. About 2 oz of lead with the 5 cell battery pack and glow driver up front opposite the engine. Hopefully I will get it to the field Sunday and setup the engine. I used different hardware and carbon rods. I enclosed the wheel wells with 1/64 ply and added a baffle to the cowl. I drilled holes in the cowl ring for extra hot air outlet. Dave Platt recommends a OS 108 for his 79" 15 pound Zero (I saw one of these with a Saito 170 power in it) which will be on my building board next. I entend to add details to the Platt Zero so the weight will probably be in the 19 pound range and I have a OS 160 fx which will probably give more power than needed. I will post some pics and coment about flying later.
The Laser 100 is taller and the cowl will have to be cut. That is something I try hard to avoid. Personaly I think a 2 stroke 90 should be more than enough unless a rocket is desired.
Carl
09-03-2004, 10:35 AM
#128
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RE: GSP Zero
The Laser 120, according to the Laser website, weighs only 786 g, which is 27.6 oz. That's light for a 120. And you need only 2 oz of nose weight after putting the battery pack by the engine? That's pretty good.
SJN:
So Saito 150/180 should balance it out, right? Did you have to add any nose weight?
I sure don't need the power of Saito 180 for this plane. I guess I still want to swing a 16" 3-blade prop just for the look. Maybe a Super Tigre G2300 would be the ticket. It weighs 37 oz. including the stock muffler. I've heard that Pitts style muffler on this engine is bad news, so I'd try to see if the [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXFV89&P=7]stock muffler [/link] would fit inside this Zero's cowl. It's actually very compact for a stock muffler, but being 6" long it may just be a little too long. Well, time to bring the plane & cowl to my favorite LHS for some trial fitting.
SJN:
So Saito 150/180 should balance it out, right? Did you have to add any nose weight?
I sure don't need the power of Saito 180 for this plane. I guess I still want to swing a 16" 3-blade prop just for the look. Maybe a Super Tigre G2300 would be the ticket. It weighs 37 oz. including the stock muffler. I've heard that Pitts style muffler on this engine is bad news, so I'd try to see if the [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXFV89&P=7]stock muffler [/link] would fit inside this Zero's cowl. It's actually very compact for a stock muffler, but being 6" long it may just be a little too long. Well, time to bring the plane & cowl to my favorite LHS for some trial fitting.
09-03-2004, 07:33 PM
#131
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RE: GSP Zero
Thanks Carl. I would mount mine inverted. As the cowl would need to be cut out for exhaust exit etc, a cut would have to be done anyway. A larger cut out would allow for head clearance as well.
Let me know how it flies, please.
I have a review of this model powered by an OS 91 FX. It flew o.k. but the reviewer felt that a slightly bigger powerplant would be better. If you want a copy, e-mail me and I will send a scanned copy back to you.
With the required ballast for C of G issue that has come to it the fore since this thread started, it seems that something like the ST 2300 would fit the bill nicely, with little if any ballast needed if that motor is fitted.
By ST's own admission, it is more powerful than its bigger 3250 brother and swings an 18 inch prop just fine.
Having said all that, I don' t really want to purchase another motor and hope to get away with the Laser 100. If it doesn't suit, then I guess I will have to get purchase a ST.
Sean, 1st news that I have heard of any ST bucking at a Pitts Muffler. Slimline make a very nice unit for the ST 2300. It fits in behind and below the engine mount. (Cat # SL2112S)
Let me know how it flies, please.
I have a review of this model powered by an OS 91 FX. It flew o.k. but the reviewer felt that a slightly bigger powerplant would be better. If you want a copy, e-mail me and I will send a scanned copy back to you.
With the required ballast for C of G issue that has come to it the fore since this thread started, it seems that something like the ST 2300 would fit the bill nicely, with little if any ballast needed if that motor is fitted.
By ST's own admission, it is more powerful than its bigger 3250 brother and swings an 18 inch prop just fine.
Having said all that, I don' t really want to purchase another motor and hope to get away with the Laser 100. If it doesn't suit, then I guess I will have to get purchase a ST.
Sean, 1st news that I have heard of any ST bucking at a Pitts Muffler. Slimline make a very nice unit for the ST 2300. It fits in behind and below the engine mount. (Cat # SL2112S)
09-04-2004, 08:00 AM
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RE: GSP Zero
This is what I did to figure the size of propeller to use for scale. I copied the length of 1 blade and placed it over the cowl to see that these 2 have about the same dimension. So since this cowl is 8" tall, the prop blade should be 8" outside the spinner. Using a 3" spinner, it brings the prop diameter to 8"x 2 + 3" = 19"
09-10-2004, 06:38 PM
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RE: GSP Zero
Then an RCV 120 would really have to be your engine of choice if you want to keep it in the correct powerband for the models design.
09-13-2004, 03:00 AM
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RE: GSP Zero
There was a thread going on the GSP FW-190, either in this section or the ARF section. Can remember the thread but can't remember where it was.
09-13-2004, 09:10 AM
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RE: GSP Zero
Woody 51
I did the maiden yesterday. I set up the travel at recommended except the rudder had more. I found the elevator sensitive and the ailerons not sensitive. I decreased the elev and increased the aileron. It really grooved well. I got 8,000 rpm using a APC 15x8 prop. Straight line speed was about scale maybe a little slow. It went veritical for 50 plus feet which is not scale. I wanted to try a 14x8 which might give 9,000 rpm. The Zero did not slow down quickly so drop power early. I lost it on the third flight. Not sure what happened but maybe I got shot down. Going to get another today. Its a very nice ARF. I don't think there is a great difference between the Laser 100 and 120 performance wise. If you want scale like performance then you will probably be happy. It flew well at half throttle.
The fuel tank is in the center so I mounted the Laser at an angle which lined the carb with the tank. Inverted I think the carb will be to low and it will flood to be rich. If you can keep the weight at 11 pounds of less I would think the OS 108 or a 4s 120 will give more then scale performance. Remember Zero's danced at medium speeds and climb fast but were not good in a dive. The model 52 with the exhaust ports on the side like the kit here had different flying qualities though.
Carl
I did the maiden yesterday. I set up the travel at recommended except the rudder had more. I found the elevator sensitive and the ailerons not sensitive. I decreased the elev and increased the aileron. It really grooved well. I got 8,000 rpm using a APC 15x8 prop. Straight line speed was about scale maybe a little slow. It went veritical for 50 plus feet which is not scale. I wanted to try a 14x8 which might give 9,000 rpm. The Zero did not slow down quickly so drop power early. I lost it on the third flight. Not sure what happened but maybe I got shot down. Going to get another today. Its a very nice ARF. I don't think there is a great difference between the Laser 100 and 120 performance wise. If you want scale like performance then you will probably be happy. It flew well at half throttle.
The fuel tank is in the center so I mounted the Laser at an angle which lined the carb with the tank. Inverted I think the carb will be to low and it will flood to be rich. If you can keep the weight at 11 pounds of less I would think the OS 108 or a 4s 120 will give more then scale performance. Remember Zero's danced at medium speeds and climb fast but were not good in a dive. The model 52 with the exhaust ports on the side like the kit here had different flying qualities though.
Carl
09-13-2004, 10:47 PM
#144
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RE: GSP Zero
I just got my GSP-ZERO up in the air also this weekend.
YES, the elevator is very sensitive,it only needs about half the travel.
Also had to set the CG at the lowest setting(145mm). Only 2-flights on it so far and seems to fly nice.
I`m using a Webra 1.20 2-stroke with pitts. and a 15x8 prop(Great Power).
The ZERO would be nicer if it had flaps to slow down. The only thing I do not care for on this ZERO is the extra long retract strut wires you got to have. With 3/16 wire they still wobble too much. The strut wires are almost 9" long. I cut the wheel wells out alittle bigger and closer to the retact so I could cut off alittle more from the wire,but does not help any.
They didn`t have to make the tire well opening so far away from the retract formers, the landing gear does not need to be that long.
YES, the elevator is very sensitive,it only needs about half the travel.
Also had to set the CG at the lowest setting(145mm). Only 2-flights on it so far and seems to fly nice.
I`m using a Webra 1.20 2-stroke with pitts. and a 15x8 prop(Great Power).
The ZERO would be nicer if it had flaps to slow down. The only thing I do not care for on this ZERO is the extra long retract strut wires you got to have. With 3/16 wire they still wobble too much. The strut wires are almost 9" long. I cut the wheel wells out alittle bigger and closer to the retact so I could cut off alittle more from the wire,but does not help any.
They didn`t have to make the tire well opening so far away from the retract formers, the landing gear does not need to be that long.
09-30-2004, 03:50 PM
#145
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RE: GSP Zero
carlbecker, thats awfull [X(][
]
Where did you have the cg ?
Ill finish mine off soon.....I hope [8D]
sorry for not following the thread......I had another project to finish first. http://www.rcuniverse.com/forum/Yak%...2162263/tm.htm
]Where did you have the cg ?
Ill finish mine off soon.....I hope [8D]
sorry for not following the thread......I had another project to finish first. http://www.rcuniverse.com/forum/Yak%...2162263/tm.htm
10-01-2004, 07:12 AM
#147
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RE: GSP Zero
Hi SJN, I can see you are online now.
I want to ask you somthing.
Wen you are using a webra engine, what do yo do to adjust the niddle valble. Do you have to use a screw to do it?
OS engines it has a hole tu enlarge the niddle valble adjust out of fuselage.
I have a 1.20 webra, and I don´t know how to do it.
Ah! nice job with the Zero. I have one seagull zero, but I don´t like the wings design. It´s not real.
I want to ask you somthing.
Wen you are using a webra engine, what do yo do to adjust the niddle valble. Do you have to use a screw to do it?
OS engines it has a hole tu enlarge the niddle valble adjust out of fuselage.
I have a 1.20 webra, and I don´t know how to do it.
Ah! nice job with the Zero. I have one seagull zero, but I don´t like the wings design. It´s not real.
10-01-2004, 08:50 AM
#148
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RE: GSP Zero
SNJ,
I bought another and am almost ready again. I really like how the Zero flys. The CG was at the 145mm mark.
Going to try a 14x8 APC this time.
I hope you can slow the plane down using a Webra 120, its much more power than needed. The Webra 120 should give about 9k with a 16x8 prop. Be sure to turn around when you pass the Moon.
I have a Webra 120 and plan to put it in a DP Ultimate 11.5 pound aerobat or IMP Mitsubishi Claude 83" ws at 16 pounds.
Carl
I bought another and am almost ready again. I really like how the Zero flys. The CG was at the 145mm mark.
Going to try a 14x8 APC this time.
I hope you can slow the plane down using a Webra 120, its much more power than needed. The Webra 120 should give about 9k with a 16x8 prop. Be sure to turn around when you pass the Moon.
I have a Webra 120 and plan to put it in a DP Ultimate 11.5 pound aerobat or IMP Mitsubishi Claude 83" ws at 16 pounds.
Carl
10-01-2004, 09:09 AM
#149
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RE: GSP Zero
Mine(CG) is also set at 145mm. The CG needs to be set right around 145mm,anymore then that is too tail heavy. I also have a Webra 1.20 with pitts.in the Zero,and it has tons of power!
Flys good,but NEEDS FLAPS! You need long landing on this one.
Flys good,but NEEDS FLAPS! You need long landing on this one.
10-01-2004, 09:04 PM
#150
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RE: GSP Zero
AntonioE, it is a problem with the Webra 91 
It doesn`t have a hole you can stick some wire in to make it longer. But since its not going to power the Zero, its not a problem any more [8D] Its now in my 60 size extra 300, and its not a problem.
Im flying around with the Saito 150 in my Yak. When I find a larger engine for my Yak, then ill be able to get on with the zero [&:]
I think the webra 91 that I installed earlier in the thread would be a tad too small. The saito 150 will be great for it.
It doesn`t have a hole you can stick some wire in to make it longer. But since its not going to power the Zero, its not a problem any more [8D] Its now in my 60 size extra 300, and its not a problem. Im flying around with the Saito 150 in my Yak. When I find a larger engine for my Yak, then ill be able to get on with the zero [&:]
I think the webra 91 that I installed earlier in the thread would be a tad too small. The saito 150 will be great for it.