Prop choice GPU 220

Airboat propeller discussion.
Hjbjzj
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Prop choice GPU 220

Postby Hjbjzj » Fri Jun 24, 2016 7:41 am

Hey everyone,

I currently have a 14' gilileo with 4 seater rigging (heavy boat/heavy rigging). It has a gpu 220 that is currently being rebuilt. It will be receiving a dual mag upgrade and o470r pistons.

Also the boat was spinning a 74" signature series prop at 2950 rpm at pitch Mark 2.

The boat pushed ok. I'd get stuck in really thick heads of saw grass. I'll be adding a grass rake to help. Ran nice in open water. Cruised at 30mph at 2300rpm. Topped out 40 mph.

I am considering a new prop and I'm looking purely for push. I don't want to be the only boat not making it to camp. 150 yards of a dry.

Thanks
Justin

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scottyroll
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Re: Prop choice GPU 220

Postby scottyroll » Fri Jun 24, 2016 7:54 am

It looks like you are propped right but too heavy.

No prop can fix that.
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schmidtav2
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Re: Prop choice GPU 220

Postby schmidtav2 » Fri Jun 24, 2016 8:05 am

For push, in my opinion, you will be hard to beat a Sensenich NGQ 2 blade 74" diameter. The next best option would be a Whirlwind Whisper Tip 2 blade 74" diameter.
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giggit
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Re: Prop choice GPU 220

Postby giggit » Fri Jun 24, 2016 8:12 am

X2 on the whisper tip

Call Patti at Whirlwind Propellers!
619) 562-3725

Excellent service that cant be beat...JMO
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Re: Prop choice GPU 220

Postby jeepinocala1111 » Fri Jun 24, 2016 8:18 am

Hjbjzj wrote:Hey everyone,

I currently have a 14' gilileo with 4 seater rigging (heavy boat/heavy rigging). It has a gpu 220 that is currently being rebuilt. It will be receiving a dual mag upgrade and o470r pistons.

Also the boat was spinning a 74" signature series prop at 2950 rpm at pitch Mark 2.

The boat pushed ok. I'd get stuck in really thick heads of saw grass. I'll be adding a grass rake to help. Ran nice in open water. Cruised at 30mph at 2300rpm. Topped out 40 mph.

I am considering a new prop and I'm looking purely for push. I don't want to be the only boat not making it to camp. 150 yards of a dry.

Thanks
Justin



Hands down 72 ngq if it's a 220 72 is all you need and I found the ngq to push the best. Now if you have a conversion 220 with 470 jugs then I have no idea.


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kwanjangnihm
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Re: Prop choice GPU 220

Postby kwanjangnihm » Fri Jun 24, 2016 8:20 am

Justin are you blocking clean air flow to the prop with the seat and cage setup?

A 74" sig typically has good push, but I'm wondering if it's spinning higher due to blocked air?

Have you pitched it down to 2700-2850 range? Also are you running poly or slick bottom?
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Hjbjzj
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Re: Prop choice GPU 220

Postby Hjbjzj » Fri Jun 24, 2016 8:53 am

Boat has poly. And a full cage. I have not pitched it to the 3 Mark yet. If I figure how to upload a pic I'll do that. But I believe that there is plenty of airflow to the prop. I could be wrong. The motor was very healthy till I ran her low on oil.

Would a prop that comes into power quicker be any better? For instance like a Saber, razor, or excalibur?

Hjbjzj
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Re: Prop choice GPU 220

Postby Hjbjzj » Tue Jul 05, 2016 6:11 pm

Any more opinions on the matter? Considering buying the NGQ or excalibur.

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Deano
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Re: Prop choice GPU 220

Postby Deano » Tue Jul 05, 2016 7:37 pm

I agree with kwanjangnihm, in that you have some heretofore unidentified complication. There are many 540s
and a couple Cadillacs running around on bigger hulls that don't act like what you are describing.

I do not have a different prop recommendation for you, but I would keep putting pitch in it until you are only turning about 2750 as was suggested and see how it acts before I went prop shopping.

If your cage and/or something else is severely hampering the prop's ability to get a clean bite of air, no prop is going to perform like it was designed to
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Re: Prop choice GPU 220

Postby jeepinocala1111 » Tue Jul 05, 2016 8:41 pm

Hjbjzj wrote:Any more opinions on the matter? Considering buying the NGQ or excalibur.


Got with the ngq 72" perfect prop.

Hjbjzj
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Re: Prop choice GPU 220

Postby Hjbjzj » Tue Jul 05, 2016 10:46 pm

I'll wait till the boat is all back together. Ill add more pitch to the signature series.

Appreciate the input everyone.


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