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Old 08-02-2012, 02:53 PM   #1
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Prop size question

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Hi everyone,

Quick question...I have a DLA-56 on a GP Ultimate. It flies great with a 22X8 prop. However, I busted my prop when my rubber wheels grabbed into the wheel pants and it acted like a brake causing a noseover and hence a busted prop. Nearest hobby shop is 3.5 hours away. They have a 21X10 prop and my question is can I effectively use it. I know the DLA-56 recommends starting at 22x8, but should I use the 21X10?

Thanks for your input.

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Old 08-02-2012, 03:07 PM   #2
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Re: Prop size question

I would stay with the 22x8 or Im running a 23x8 or try a 22a from zoar on my DA50.
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Old 08-02-2012, 05:50 PM   #3
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Re: Prop size question

Such a swap is a 'Break Even'.

You deccreased the diameter by 1" and increased the pitch - so the load on the engine will be as close to a constant as you can hope for.

However - once you are in the area of the Hobby Shop - certainly pick up a spare 22 x 8.

The next question is 'How close are you to completing the break in of the engine?' Once the break in is complete you can easily up the load on the engine - check your owner's manual to be sure.

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Old 08-02-2012, 06:10 PM   #4
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Re: Prop size question

You'll find that the 21x10 won't perform as nice as the 22x8 - it is flyable, but won't respond like the 22x8. Also, be careful if you are switching brands, depending on the brand - you may find the RPMs too high.

Keep in mind - the prop can unload as much as 1500 - 2000RPM in the air (depending on the brand). If you are getting RPMs in the mid to high 7000s on the ground - you could be spinning that prop over 9000RPM in the air. Most of these engines are only rated for 9,000 - 10,000 RPM.

Remember - you don't have to fly at full throttle.

Once the engine is broken in, you should probably switch to a 22x10 or 23x8.

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Old 08-02-2012, 06:20 PM   #5
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Re: Prop size question

Yes you can use a 21-10. You will gain some speed and rpm, but it will not hurt a thing. .
I have used a 21-10 with my DA 50 on my S2 cub when I damaged the prop tip on a 22-8. Worked fine no problems whatever.

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Old 08-03-2012, 01:08 AM   #6
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Re: Prop size question

Being a bi-plane with more drag I would stay with the 8 pitch props. xoar laminated are my favorite.

Order from Great Hobbies, Azure hobbies, Thunderbolt RC and save the 7 hour trip. Order a spare as well.

If you go with the 10 pitch do a retune, the 10 pitch will make more heat then the 8.
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