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New CRRC Pro GP50R prototype 50cc

Old 01-27-2009, 11:14 PM
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2robinhood
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Default New CRRC Pro GP50R prototype 50cc

I have a prototype CRRC pro GP50R coming.
I should have it in a week or so.
CRRC Pro is sending it to me to do testing and list my findings.
I have had CRRC Pro engines 26cc and 50cc and have had great success with them.
Low weight, great performance and reliablity.

This new GP50R will have a CNC machined case, dual bearings on the crank, single ringed piston, rear inducted carb, etc. ( DA/DL mufflers will fit this engine )

Factory numbers on the 1st run of prototype #1 were and idle of 1450 rpm and a top of 6850 rpm with a JFX 22 X 8. ( that was the 1st tank ). Now factory number claims are 7400 rpm with the JFX 22 X 8.

The props will need to be drilled with a unique 6 bolt pattern that will only fit this engine.
Maybe this will change and go to a hub that will mix match with other engines such as the DA/DL's.

I will need to gather up some 20"-23" props of different brands to use as test props for rpm #'s since when they get drilled they will only fit this engine. Anyone with any props willing to donate for test all will be welcome.
After some bench test, it will go into a 50cc extra for flight performance.

When it comes, I will take my own pictures, weights, and opinions and let you guys see what I will have.

This engine is designed to run against DA and DL-50's.

I know that my CRRC Pro GF26I is a power house and I only can keep my fingers crossed for this new 50cc engine.

Here are a few pictures that were sent to me.

















Old 01-27-2009, 11:19 PM
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2robinhood
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Default RE: New CRRC Pro GP50R prototype 50cc

OK, enigine came today.
All looks very very good.
My engine included:
Engine, pitts muffler, ignition, stand-offs, sparkplug, wrenches, prop jig, all nessesary bolt, washer & gaskets.
Weights are as follows:
Base engine with prop bolts and prop washer............. 3 lbs 1.6 oz.
Pitts muffler, muffler bolts and gasket......................... 5.5 oz.
Ignition CDI unit .................................................. ..... 3.9 oz.
That is 3 lbs 11 oz or 3.68 lbs or 58.88 oz.

My DL-50 with the stock ( light ) muffler came in at a total of:
3 lbs 7 1/2 oz or 3.46 lbs or 55.4 oz.

So the CRRC GP50R is 3 1/2 oz heavier then my DL-50 , but has a heavier pitts muffler.
Both with the DL-50 muffler, the CRRC is only 1 1/2 oz. heavier.

CNC work on the engine case is very clean and on the money.
Head casting fins are a little wavey, but not a big deal to say the least.
Sparkplug threads are clean and sloop free.
Prop main shaft is drilled for a spinner and is 10mm in dia.
Engine mounting tabs are ( CNC milled case ) 8.5mm thick.
Carb is a Walbro ( there are two numbers ) WT ( 841 ) ( 907 ) and carb is fitted with a venturi.
Ignition is the CRRC Pro auto advance CDI unit that runs on 4.8V batteries.
This engine was factory started and run, but needs to have break-in done to it.
I have some test props coming for rpm test ( JFX 22 X 8, 22 X 10, 23 X 8 ) and ( Xoar 22 X 8, 23 X 8, 23A 3-D ).
Hopefully I will get some other brands for testing also.
Until props come I am not going to be able to do any run in time and rpm figures.
A Vess or Mejzlik would be nice to try ( hint , hint ).
Any question, fire away and I will see if I can answer them.



















Old 01-27-2009, 11:30 PM
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2robinhood
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Default RE: New CRRC Pro GP50R prototype 50cc

I just laid prop jig to prop jig and this 50cc is the same prop bolt pattern as the DA/DL-100's.
Old 01-28-2009, 12:03 AM
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Default RE: New CRRC Pro GP50R prototype 50cc

Hi. The photos never came through. Can you try again with the pics.

Cheers
Grossy
Old 01-28-2009, 12:10 AM
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2robinhood
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Default RE: New CRRC Pro GP50R prototype 50cc

I have one of the stock mufflers from my DL-100 that I will run on this engine also to get some rpm numbers from a stock style DA/DL muffler set-up instead of the CRRC pitts only.
I will do it both ways, but we will be able to compare better with the same style mufflers.

Old 01-28-2009, 08:00 AM
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Default RE: New CRRC Pro GP50R prototype 50cc

I am impressed. Very clean looking engine. Hope it runs as good as it looks. Sure is easy to get confused with a DL or DA. Any price for this baby, yet? Who reps it here in the states? What airplane are you putting it in to?
Old 01-28-2009, 08:07 AM
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Default RE: New CRRC Pro GP50R prototype 50cc

Any idea of the cost? If the price is any where near the DA it will be DOA. The world doesn't need another $600.00 50.
Old 01-28-2009, 11:59 AM
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Default RE: New CRRC Pro GP50R prototype 50cc

I am currently flying the ccrc 50 with a 22x8 prop. Premium gas/ 40:1 Belray racing 2 stroke oil and it will turn 6800 rpm. On a 17.5# plane it is almost vertical at lift off. When the tail lifts I can pull straight up and over to the invert at about 10 ft altitude. A few birthing issues on the ignition (mine ran 10 min then failed replaced with new one and all is well).

I am curious though about the rear induction. Don' t know if it is easy to choke etc in the rear. I found I had to put thumb over intake prop until fuel reached the carb for the first start. Then 9 flips, ignition on until pops. Then 7 more flips choke open until it starts. This works everytime.

I have run a 20x10 prop but the engine was turning 7800 rpm and this seemed a bit high so I went to the 22x8.

I am also curious about the prop attachment. The 50 side carb uses 1 bolt which seems to work well. I machined a prop adaptor nut for the prop threads on engine side and 8x32 on the bolt side for the spinner. I am not sure about spinner attachment or prop strength with all the holes. I also back the prop washer with double sided 400 grit sandpaper to prevent prop slippage. Keep us updated. vettdvr
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Old 01-28-2009, 12:27 PM
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2robinhood
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Default RE: New CRRC Pro GP50R prototype 50cc

ORIGINAL: jimcork1

I am currently flying the ccrc 50 with a 22x8 prop. Premium gas/ 40:1 Belray racing 2 stroke oil and it will turn 6800 rpm. On a 17.5# plane it is almost vertical at lift off. When the tail lifts I can pull straight up and over to the invert at about 10 ft altitude. A few birthing issues on the ignition (mine ran 10 min then failed replaced with new one and all is well).
Yes, you are running the current 50cc ( GF50I ).
I also have that engine which runs well.
This is a all new CRRC GP50R which there are only two in the US right now. One is in a CRRC dealers hands ( which they have been running for a month or so ) and the second one just came in the mail for me to do testing with.

As far as $$, I will look into itas well as a release date.

I should have some numbers soon with my engine.

About the other engine in the US, I talked to the guy testing the GP50R and this is what he said.

My GP50 runs fantastic, I could not want any more for my 16 pound plane. I have run two different props, it turned the JXF 22x10 at over 6900 and a ZDZ 22x8 at about 7250. Idles all day at 1500. I think I'll be useing the 22x10 because I could hear the prop ripping a few times while it was in the air.
Old 01-28-2009, 07:10 PM
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mpascual
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Default RE: New CRRC Pro GP50R prototype 50cc

Today , i've received mine.
GREAT LOOK,
i'm impressed, and having knowledge about the development of this engine some months ago, i can't wait to break-in and test.

Manuel :
Spanish CRRCpro service.
Old 01-29-2009, 02:02 PM
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frieshoo
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Default RE: New CRRC Pro GP50R prototype 50cc

robinhood,

How would you rate the reliability of the ignition module that comes with the CRRC? I wonder why they don't switch to the cheaper (but reliable) RcExl ignitions.

Interested in your testing.

dennis
Old 01-29-2009, 02:31 PM
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jedijody
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Default RE: New CRRC Pro GP50R prototype 50cc

Early versions did have a some issues to work out, but over the last year or more they have been doing very well. I replace under warranty one every couple of months. I'm sure if they could buy the RcExl for less than they could manufacture their own they would. Most importanly though, they stand behind them.
Old 01-29-2009, 05:59 PM
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Default RE: New CRRC Pro GP50R prototype 50cc


ORIGINAL: frieshoo

robinhood,

How would you rate the reliability of the ignition module that comes with the CRRC? I wonder why they don't switch to the cheaper (but reliable) RcExl ignitions.

Interested in your testing.

dennis

I have't run mine yet. It is mounted on a test stand, I just am what in for some props in the mail.

I have had the 26cc and the current production 50cc ( GF50I ) and have not had issues with the CDI's.
Old 01-31-2009, 01:21 PM
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Default RE: New CRRC Pro GP50R prototype 50cc

O.K., did some running today.
I ran a light loading Xoar 20 X 8 ( That's all I had ).
I used one of my DL-100 mufflers to make a equal comparison to have the same style muffler as the DA-50 and DL-50.
Ran 32 oz. through it @ 40:1 Pennzoil Aircooled.
Only took it to 3500 rpm because of the small prop.
I just wanted to get some time in on it.
Then, the mail lady came with some props.
I put on a JFX 23 X 8 for some numbers.
I leaned the low needle in a little.
Turned the JFX 23 X 8 @ 6930 rpm with a idle of 1900 rpm and that's with only the 32 oz. run through it.
I have a JFX 22 X 10, and some more ( JFX & Xoars ) coming for more testing.
That's all for today, 21 degrees and 15 mph winds.................I'm staying inside.





Old 01-31-2009, 02:20 PM
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Default RE: New CRRC Pro GP50R prototype 50cc


ORIGINAL: wjvail

Any idea of the cost? If the price is any where near the DA it will be DOA. The world doesn't need another $600.00 50.
This engine cost will be in the range of the DL-50 but comes with a Pitts Style muffler unlike any other 50cc engine now sold. We will finish our testing and track the testing of 2robinhood and should release the engine sometime in February. 2robinhood, looks like you received the props we sent you for your testing, Jody will be flying the TT-TOC 30% Yak with this engine today using a 22 X 10 JXF. Jody will keep you posted on his testing and we will have more info on pricing and delivery soon.
Thank you
Tom
Vallley View RC
Distributor for CRRC
www.valley View RC.com
253-875-6890
Old 01-31-2009, 04:30 PM
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Default RE: New CRRC Pro GP50R prototype 50cc

JXF / Xoar 23x8 prop at 6900+ RPM!? you sure your tach is working as it should? cos thats a very very respectable performance
Old 01-31-2009, 05:38 PM
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Default RE: New CRRC Pro GP50R prototype 50cc


ORIGINAL: liquid_TR

JXF / Xoar 23x8 prop at 6900+ RPM!? you sure your tach is working as it should? cos thats a very very respectable performance
Yep, Had the tach for a few years.
I use it on all my engines and have even done back to back, to back, to back comparisons with three other tach at the flying feild.

I am very, very impressed with the rpm's and the 23 X 8.
I had a hard time believeing it myself, especially as it only had 32 oz of fuel run through it.
I had the CRRC factory tell me that they were at 7400 rpm with a JFX 22 X 8.
Maybe those numbers are possible, I have the JFX 22 X 8 coming soon and I will run it posting some numbers.
Those numbers are better then what my DL-50 ever turned that prop.
I actually have a brand new Mejzlik 22 X 8, but it is already drilled for a DA/DL 50.
To drill that prop out to this 6 bolt pattern, I would not feel safe with so many holes so close together.
I no longer have the dl-50, so if any company/anyone is willing to trade a new undrilled Mejzlik for a new drilled Mejzlik let me know.
I would love to see what numbers come from a Mejzlik.
Old 01-31-2009, 06:30 PM
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Default RE: New CRRC Pro GP50R prototype 50cc

its gona turn probably even higher rpm with the mejzlik as its a little lower load than a JXF/Xoar Prop. wow...

how was the midrange transition with the 23x8?
Old 01-31-2009, 06:49 PM
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Default RE: New CRRC Pro GP50R prototype 50cc

Is the BorexStroke posted for this engine?

Looks really good.[8D]
Old 01-31-2009, 07:35 PM
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Default RE: New CRRC Pro GP50R prototype 50cc

ORIGINAL: liquid_TR

its gona turn probably even higher rpm with the mejzlik as its a little lower load than a JXF/Xoar Prop. wow...

how was the midrange transition with the 23x8?

Mid range and transition were real good.
I will try to get some video next time, it was just to cold to stay out long today.
The CRRC factory did send me a three minute video of the GP50R running on YouTube, but this is a private video.
They did the 1st run on S/N0001, they started it, ran it at mid throttle till about 2 1/2 minutes, then went wide open for a rpm number.
The tach read 6780 rpm with a JFX 22 X 8 with-in the 1st three minutes of it's life.
Pretty good in my book for a first ever run.
Old 02-01-2009, 11:25 AM
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Default RE: New CRRC Pro GP50R prototype 50cc

your tests were done at 21 degrees, lets see how it does at 80 or 90 degrees. I think the numbers will drop.
Old 02-01-2009, 11:44 AM
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Default RE: New CRRC Pro GP50R prototype 50cc

yeah, but maybe by 50-100 RPMs.. thats all.

DA50R was spinning a 23x8 JXF / Xoar prop at 6400 RPM on the same cold day (6-8*C) DL spun 6600 RPMs.
Old 02-01-2009, 04:17 PM
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Default RE: New CRRC Pro GP50R prototype 50cc


ORIGINAL: karmann34

Is the BorexStroke posted for this engine?

Looks really good.[8D]

Bore/Stroke = 43mm x 35mm
Old 02-01-2009, 05:02 PM
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Default RE: New CRRC Pro GP50R prototype 50cc

I did some more engine running today.
Man what a differance today from yesterday.
Yesterday was 21 degrees and 15 mph winds, today is 58 degrees and still 15 mph winds.
I decided to drill the Mejzlik prop and run it.
I ran three props ( Mejzlik 22 X 8, JFX 22 X 10, JFX 23 X 8 ) and I took video of all three prop runs.
Yesterday I ran two 16 oz tank through the engine ( 32 oz. total ). Today I got new fuel, filled the 16 oz tank and ran all three props.
So, this engine after running the three props still has no more then 40 oz of fuel through it.
I did absolutely no needle turning in between props, needles stayed the same, just props were changed.
Needle tuning may get a little more rpm's with each prop, but the most rpm's will come from more run time/break-in.
I have more props ( Xoars ) coming , but here are the three videos of todays runs.

Mejzlik 22 X 8 ........ around 7400 rpm
JFX 22 X 10............. around 6700 rpm
JFX 23 X 8................around 6840 rpm



http://www.youtube.com/watch?v=78XIdVxNffE

http://www.youtube.com/watch?v=c-VW498xGAg

http://www.youtube.com/watch?v=8BAQmb0Kvr4
Old 02-01-2009, 05:31 PM
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Default RE: New CRRC Pro GP50R prototype 50cc

This baby is a winner.. that is if the price is the same as DL50 or at least very very near DL50..

BTW, JXF and Xoar are the same prop. JXF manufactures Xoar props with Xoar badge printed on it.

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