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Old Oct 28, 2007, 01:29 PM
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Ripmax Spitfir - folding or fixed prop???

Hi,

I'm just completing putting this together and would either use a 10 x 7 PC prop or a Graupner folding one.

I land nearly entirely on heather and occasionally grass.

Has anyone used a fixed prop of 10 or 11 inches and had it cause damage or does it just get knocked out of the way and not matter?
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Old Oct 28, 2007, 02:08 PM
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Aberystwyth, UK
Joined Sep 2004
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I use a 10x7 APCE fixed prop and have had no worries. Just make sure your brake is disabled on your ESC.

Mark
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Old Oct 28, 2007, 02:27 PM
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Denmark, Nordjylland, Gistrup
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I broke 2 fixed, guess what I am using now.
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Old Oct 28, 2007, 03:13 PM
UK Commercial RPAS Pilot
Scott Cuppello's Avatar
United Kingdom, England, Carlisle
Joined Mar 2007
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I use a 12x6 fixed, brake off, and never broken a prop!
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Old Oct 28, 2007, 11:27 PM
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My husband uses a fixed prop on his Ripmax plane. I just went and looked at it and it says 11x7 on it. Its a grey thin like prop
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Old Oct 29, 2007, 02:49 AM
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Norway
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I use a Grupner folding 11x7 on my spit, very pleased with it. It`s just fun to dive from some altitude, goes like a rocket. I use fixed props on all of my other planes in the same size, and I supose I have broken one or two on prop on every plane, tried with and whitout brackes on the ESC.
High speed belly landings maybe not the best for fixed props
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Old Oct 29, 2007, 05:21 PM
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Guys - why brake off? 've been using my other models with the brake on. Landing wiht the prop spinning greatly increases the chances of it breaking and the brakes will allow the prop to get knocked out of the way as if they weren't on, but will also ensure the prop stops spinning before hitting the ground. I'm baffled!
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Old Oct 29, 2007, 05:41 PM
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USA, MD, Annapolis
Joined Feb 2005
4,886 Posts
Brake on may prevent the prop from moving out of the way on landing. I "belly flop" and have never broken a prop. Close the throttle completely before touchdown.
Gary
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Old Oct 30, 2007, 03:10 AM
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Norway
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I do agree brake on. As on my Ripmax Bf 109 I use brake, but after some weeks with nice landings the other day I broken the propeller in the following two landings?? .The third one was realy not a landing but more like an impact, but that is another story.
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Old Oct 30, 2007, 12:57 PM
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How about this for a tactic:

Come in to land, cut power at 15 feet with brake on. If prop rests fairly horizontal, then land, otherwise a blip of power to maintain height and hope it's now horizontal. If not, fly around again
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Old Oct 30, 2007, 01:17 PM
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Aberystwyth, UK
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Quote:
Originally Posted by CIS121
How about this for a tactic:

Come in to land, cut power at 15 feet with brake on. If prop rests fairly horizontal, then land, otherwise a blip of power to maintain height and hope it's now horizontal. If not, fly around again
Tell me your joking

Mark
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Old Oct 30, 2007, 01:32 PM
All under control, Grommit!
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United Kingdom, Aberdeen
Joined Sep 2000
12,588 Posts
Have broken a few 11x7 APC-E props on my funfighters over the years and my boy broke an 8x6 APC-E on his Ripmax Spit maiden - al brake off, belly landed on short grass. You can go ten flights without breaking one, then break two in a row. Some people use the orange Perkins flexy props but after having bought a couple of those I haven't broken an APC-E.
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Old Oct 30, 2007, 02:48 PM
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southern England
Joined Aug 2007
462 Posts
I went straight to a 10x7 folding prop , but even with the brake on the prop still windmills
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Old Oct 31, 2007, 04:29 AM
UK Commercial RPAS Pilot
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United Kingdom, England, Carlisle
Joined Mar 2007
2,608 Posts
I must be lucky, I have never broken a prop.....mind you....the lack of glue on the firewall is usually what gives way first! The O/E spinner breaks, I do actually like the look of it, but it's fragile, but Iv'e never broken a prop.....with brake off.
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Old Nov 02, 2007, 04:18 AM
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Joined Dec 2005
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Hi CIS121 -Redtail again!I use a folding prop,works really well,because of the front fuselage shape the prop flushes against the sides very well,hence never broken a prop in 3 years.
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