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Thunder Tiger Raptors 30-90 - Imperio > RAPTOR 50 Head
 
 
devens2448
Heliman
Location: Decatur, Il

RAPTOR 50 New Kasama Head

Kasama has a new head design for the Raptor 50. I believe it is called the SRIMOK design. I believe it is similar to the N600 head. It has the flybar under the main blades and less moving parts with more collective throw -+ 14 deg I think. Would someone please comment about the new Kasama head or about the differences in performance between the 2 designs? I am still planning the use the mechanical mixing set-up from the stock Raptor.

D
05-24-2008 12:43 PM
 
 
jsenicka
Key Veteran
Location: Hampton VA

The current Kasama head for the R50 easily provides +/-14 degrees now and flies excellent. This will somewhat come down to underslung versus overslung.
The Srimok also uses a rather clever mixer configuration on the grip arm. Since I am flying the original Kasama heads on my R50 and Srimok on my R90's, I will likely need to try a Srimok R50

Jim Senicka
3x R50V2/OS50/Kasama - 3x R90/OS91/Kasama
Futaba12FGH 2.4g
05-24-2008 01:02 PM
 
 
ANDYC
Heliman
Location: BICESTER/OXON england

The srimok 50 size head you are refering to is for the trex 600 no doubt it would fit the raptor though. see www.ziprc.com
05-24-2008 01:33 PM
 
 
Ben-T-Spindle
Elite Veteran
Location: Central Illinois

Do you have a link or photo?

... BTS
05-24-2008 02:06 PM
 
 
Ben-T-Spindle
Elite Veteran
Location: Central Illinois

I tried to fit a Srimok to the Raptor but it would not fit. The bolt hole in the head does not line up with the hole in the main shaft. You could drill the mainshaft to make it fit. The hole needs to be about 3mm from the end of the shaft.

Kasama will probably come out with a slightly different Srimok head block so it will fit Raptor 50.




Looking at the Kasama web sight I see that they will have a flybarless head soon. That might be the future for the Raptor 50. Now if they could just get the flybarless electronics down to a reasonable price – can’t wait for the $50 Chinese cones to hit the market.



... BTS
05-24-2008 02:11 PM
 
 
devens2448
Heliman
Location: Decatur, Il

oh ya I forgot the link to the product

Here is the new style head I am looking at

http://www.grandrc.com/inc/sdetail/59287

AMA #497873 Member of Decatur AeroCommanders
05-24-2008 03:02 PM
 
 
MickeyMoo
Senior Heliman
Location: central Ohio

The old head came up for me with the link above. Try http://www.grandrc.com/k_trex600 Click on Kasama 600 head at the top right of the page. It says it fits Raptor 30\50. If I'd have to drill a hole in the main shaft to fit it, I think I'd stay with the old head unless there is a clear advantage Is there an advantage to a under-slung setup or is it just appearance?
05-24-2008 07:07 PM
 
 
Ben-T-Spindle
Elite Veteran
Location: Central Illinois

I was working on trying to get it to fit today. I re-drilled the stock mainshaft and it looks like it’s going to work ok.

Everyone should just be aware that it takes a good bit of work to fit the T-Rex version to a Raptor. It’s not a bolt on instillation.

Dill a new hole at the top of the shaft about 3mm from the top. Drill the new hole 90 degrees to the existing hole. If you have the hard main shaft (PV0451) you will need a drill bit capable of drilling hardened steel. I used a #31 carbide drill bit and a drill press with a drilling vice. Drilling a hard round shaft is almost impossible if you don’t have the right equipment.

You will also have to make custom head linkage.




... BTS
05-25-2008 12:18 AM
 
 
Ben-T-SpindleElite Veteran - Location: Central Illinois -
Hear is a photo of the Srimok head on my Raptor E620 with 140 eCCPM. Instillation on a Raptor 30, 50, or Titan should be the same.



... BTS
05-25-2008 12:45 AM
 
 
Ben-T-Spindle
Elite Veteran
Location: Central Illinois

After a few flights I do like it batter than the standard Kasama Raptor head. It has adjustable Bell-Hiller mixing so you can fine tune it to your liking. I have the swash side of the mixing lever on the inner hole and the other side on the outer hole. That gives you maximum cyclic and collective pitch.

So far these are the differences between the Kasama Raptor and Kasama Srimok that that I noted:

Easier to get +/- 14 with out binding.

Higher cyclic rate with the same paddles and flybar.

It feels a little different in flight. With small inputs it feels a little more solid and is less sensitive. When you put in full cyclic it is definitely faster. The guys with the Srimok head on their Raptor 90’s will know what I am talking about.




... BTS
05-25-2008 12:54 AM
 
 
Ben-T-Spindle
Elite Veteran
Location: Central Illinois

Another advantage is the blades are higher above the boom so you have less change of a boom strike.

... BTS
05-25-2008 02:11 PM
 
 
Ben-T-SpindleElite Veteran - Location: Central Illinois -
The spindle on the Srimok head is much larger and has a very nice O-ring damper system. This is strong enough for those big block conversions.


.


... BTS
05-25-2008 02:17 PM
 
 
devens2448
Heliman
Location: Decatur, Il

mods for the Srimok

That bites that you have to modify the main shaft. The guy at GrandRC said that if I told him what swash I was using that he would set me up with the right linkage. I didn't speak to him in to much depth because I wanted to research it first.

I was also wondering about getting part for the head. Specifically the plastic parts. I wonder if those have to be bought through GrandRC or if they are just T-rex parts.

Where did yo get your head for the 600e BTS? By reading your posts it sounds like you had a t-rex version laying around that you modified and flew for the first time in the past day.

D

AMA #497873 Member of Decatur AeroCommanders
05-25-2008 03:44 PM
 
 
Ben-T-Spindle
Elite Veteran
Location: Central Illinois

I have two Srimok heads – one that I have been flying on my T600 for about 90 flights. The other I have been trying to work out a good instillation on my Raptor for over a month.

I first tried to use the stock shaft and grind the top to make it work. I got it installed but at high pitch the washout base hit the bottom of the head block and at max negative pitch when I applied cyclic the link on the washout arm hit the swashplate. If you restrict the pitch to about +/- 9.5 it would be flyable but that's not really what you want.

I tried a longer shaft from Miniature Aircraft but that didn’t work because it was too long and the washout base was below the alignment pins.

I finally went out and got some carbide bits and re-drilled the stock hardened main shaft. Everything is now perfect.

To make a head kit that fits they could offer a package deal with a re-drilled main shaft and linkage or Kasama could make a head block specifically for the Raptor.




... BTS
05-25-2008 05:36 PM
 
 
Ben-T-Spindle
Elite Veteran
Location: Central Illinois

As far as parts – there is no plastic on the Srimok head. Grand RC has all the parts. I used the stock flybar. The head comes with a washout base but no levers. I used Kasama levers but they are stock dimensions so stock or aftermarket Raptor levers will work. The radius link is stock Raptor.




... BTS
05-25-2008 05:41 PM
 
 
devens2448
Heliman
Location: Decatur, Il

I see there is black anodized parts.

Well I am going to order a new head Tuesday and I will update the thread if there have been any changes to the Raptor package from what you have posted BTS.

I found this on Harbor Freight that may have to be added to my heli toolbox. http://www.harborfreight.com/cpi/ct...temnumber=92046

Thanks for all the feedback.


D

AMA #497873 Member of Decatur AeroCommanders
05-25-2008 07:16 PM
 
 
Ben-T-SpindleElite Veteran - Location: Central Illinois -
One other advantage is that the Srimok head comes with bearings installed. For those that found installing bearings in the Kasama Raptor grips to be a pain, this is a welcome improvement. Because the spindle is larger diameter the Srimok head needs larger bearings – 8 x 16 x 5 radial bearings and 8 x 16 x 5 thrust bearings.

I also like the flybar lever design – much better than putting levers on the outside or using a cage. It seams like everything about this design is an engineering masterpiece.



.


... BTS
05-25-2008 11:08 PM
 
 
lloyd
Key Veteran
Location: Port Elizabeth,South Africa

Ausome as I realy like the simplicity and look of this head................

Well done Kasama

lloyd

future of nitro is ELECTRIC
05-27-2008 06:42 AM
 
 
Ben-T-Spindle
Elite Veteran
Location: Central Illinois

For anyone installing one of these heads I used to following head control rod lengths.

25mm washout lever to flybar
75mm swashplate to mixing lever




... BTS
05-27-2008 11:02 PM
 
 
devens2448
Heliman
Location: Decatur, Il

new head arrived

Well my new head arrived today. I have just barely looked at it. was able to get a couple of bonus items! He threw in a set of metal t-rex washout arms because I still have plastic on my Raptor. He said I might have to shim them out a little but he thought they were tighter than the metal Titan ones. I also got a set of linkages. Now I just have to wait for my mainshaft to show up from Heliproz. That might not be until next week! I was able to change my order for 2 Raptor spindals to the T-Rex spindals just before the order shipped! I didn;t catch on to what BTS had said about the larger spindal but I noticed it in the packaging.

What did you mean BTS by the larger spindal will work with the big block conversion?

AMA #497873 Member of Decatur AeroCommanders
05-29-2008 12:08 AM
 
 
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Thunder Tiger Raptors 30-90 - Imperio > RAPTOR 50 Head
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